Study Of Ignition And Emissions In A Direct Injected Compression Ignition Natural Gas Engine

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Study of Ignition and Emissions in a Direct Injected, Compression Ignition Natural Gas Engine

Author : Ivan Gogolev
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Study of Ignition and Emissions in a Direct Injected, Compression Ignition Natural Gas Engine by : Ivan Gogolev

Download or read book Study of Ignition and Emissions in a Direct Injected, Compression Ignition Natural Gas Engine written by Ivan Gogolev and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural gas direct injection and glow plug ignition assist technologies were implemented in a single-cylinder, optically-accessible engine. Initial experiments studied the effects of injector and glow plug shield geometry on ignition quality. Injector and shield geometric effects were found to be significant, with only two of 20 tested geometric combinations resulting in reproducible combustion. Further experiments explored the effects of equivalence ratio and intake pressure on ignition delay, engine performance, and exhaust emissions. Combustion was found to proceed in a stratified-premixed mode at lower equivalence ratios, and a free-mixing mode at the higher equivalence ratios. Both combustion modes resulted in high NOx emissions. Stratified-premixed combustion produced higher hydrocarbon emissions, and lower levels of particulate matter and carbon monoxide, when compared to free-mixing combustion. Higher intake pressure was found to reduce all emissions levels. This effect was largely attributed to better charge mixing achieved from pressure-driven increase in engine swirl momentum.

Computational Studies of Gas Injection, Ignition and Combustion Emissions in a Direct-injection Natural Gas Engine

Author : Kang Pan
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Computational Studies of Gas Injection, Ignition and Combustion Emissions in a Direct-injection Natural Gas Engine by : Kang Pan

Download or read book Computational Studies of Gas Injection, Ignition and Combustion Emissions in a Direct-injection Natural Gas Engine written by Kang Pan and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The direct-injection of natural gas into the compression-ignition engines is attractive, due to its emission advantage and diesel-equivalent efficiency. The computational simulation of this next-generation heavy-duty engine can provide deep insights of the gas injection and ignition characteristics and help understand the emission formation process, and hence, a KIVA-3v based three-dimensional computational model was developed and improved to represent the configuration of a glow plug assisted direct-injection natural gas engine. This thesis presents the important conclusions about the numerical studies of the natural gas ignition and emissions by using this engine computational model. Preliminary simulations revealed that the shield for a glow plug, an ignition assist for natural gas in compression-ignition engines, can highly improve the natural gas ignition stability compared to an unshielded glow plug, and the design of the glow plug shield has great potential for the further improvement of the natural gas ignition. The different shield designs, characterized by the parameters such as shield opening shape, number and distribution, were evaluated by using the improved KIVA model. The simulated results clearly demonstrated the three key functions of a good shield design. A multi-opening shield, consisting of four small openings in a diamond shape, can achieve all three requirements and hence highly reduce the natural gas ignition delay and improve the ignition stability, compared to the original single-opening shield. The proper emission models are critical for the numerical simulations of natural gas engine emissions. For the gaseous species, a kinetic package, CANTERA, is coupled to KIVA CFD code to simulate the formation of important emissions, such as C2H2 and NOx. However, the available detailed mechanisms, such as GRI-3.0, will over-predict the ignition delay at low temperature (

Advances in Compression Ignition Natural Gas – Diesel Dual Fuel Engines

Author : Hongsheng Guo
Publisher : Frontiers Media SA
ISBN 13 : 2889666212
Total Pages : 125 pages
Book Rating : 4.8/5 (896 download)

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Book Synopsis Advances in Compression Ignition Natural Gas – Diesel Dual Fuel Engines by : Hongsheng Guo

Download or read book Advances in Compression Ignition Natural Gas – Diesel Dual Fuel Engines written by Hongsheng Guo and published by Frontiers Media SA. This book was released on 2021-03-23 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Autoignition and Emission Characteristics of Gaseous Fuel Direct-injection Compression-ignition Combustion

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (68 download)

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Book Synopsis Autoignition and Emission Characteristics of Gaseous Fuel Direct-injection Compression-ignition Combustion by :

Download or read book Autoignition and Emission Characteristics of Gaseous Fuel Direct-injection Compression-ignition Combustion written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy-duty natural gas engines offer air pollution and energy diversity benefits. However, current homogeneous-charge lean-burn engines suffer from impaired efficiency and high unburned fuel emissions. Natural gas direct-injection engines offer the potential of diesel-like efficiencies, but require further research. To improve understanding of the autoignition and emission characteristics of natural gas direct-injection compression-ignition combustion, the effects of key operating parameters (including injection pressure, injection duration, and pre-combustion temperature) and gaseous fuel composition(including the effects of ethane, hydrogen and nitrogen addition) were studied. An experimental investigation was carried out on a shock tube facility. Ignition delay, ignition kernel location, and NOx emissions were measured. The results indicated that the addition of ethane to the fuel resulted in a decrease in ignition delay and a significant increase in NOx emissions. The addition of hydrogen to the fuel resulted in a decrease in ignition delay and a significant decrease in NOx emissions. Diluting the fuel with nitrogen resulted in an increase in ignition delay and a significant decrease in NOx emissions. Increasing pre-combustion temperature resulted in a significant reduction in ignition delay, and a significant increase in NOx emissions. Modest increase in injection pressure reduced the ignition delay; increasing injection pressure resulted in higher NOx emissions. The effects of ethane, hydrogen, and nitrogen addition on the ignition delay of methane were also successfully predicted by FlameMaster simulation. OH radical distribution in the flame was visualized utilizing Planar Laser Induced Fluorescence (PLIF). Single-shot OH-PLIF images revealed the stochastic nature of the autoignition process of non-premixed methane jets. Examination of the convergence of the ensemble-averaged OH-PLIF images showed that increasing the number of repeat experiments was the most.

Advanced Direct Injection Combustion Engine Technologies and Development

Author : H Zhao
Publisher : Elsevier
ISBN 13 : 1845697324
Total Pages : 325 pages
Book Rating : 4.8/5 (456 download)

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Book Synopsis Advanced Direct Injection Combustion Engine Technologies and Development by : H Zhao

Download or read book Advanced Direct Injection Combustion Engine Technologies and Development written by H Zhao and published by Elsevier. This book was released on 2014-01-23 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct injection enables precise control of the fuel/air mixture so that engines can be tuned for improved power and fuel economy, but ongoing research challenges remain in improving the technology for commercial applications. As fuel prices escalate DI engines are expected to gain in popularity for automotive applications. This important book, in two volumes, reviews the science and technology of different types of DI combustion engines and their fuels. Volume 1 deals with direct injection gasoline and CNG engines, including history and essential principles, approaches to improved fuel economy, design, optimisation, optical techniques and their applications. Reviews key technologies for enhancing direct injection (DI) gasoline engines Examines approaches to improved fuel economy and lower emissions Discusses DI compressed natural gas (CNG) engines and biofuels

Remote Sensing of the Atmosphere for Environmental Security

Author : Agnès Perrin
Publisher : Springer Science & Business Media
ISBN 13 : 1402050909
Total Pages : 347 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Remote Sensing of the Atmosphere for Environmental Security by : Agnès Perrin

Download or read book Remote Sensing of the Atmosphere for Environmental Security written by Agnès Perrin and published by Springer Science & Business Media. This book was released on 2007-01-21 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume continues presentation of the proceedings of a NATO Advanced Research Workshop (ARW) held at Rabat, Morocco on the 17-19th of November 2005 entitled Remote Sensing of the Atmosphere for Environmental Security. Coverage includes a review of recent and upcoming experimental satellite measurements of the Earth’s atmosphere, characterisation of pollution in urban areas and the growing lack of water in many countries of the Mediterranean area, and more.

Assessment of Fuel Economy Technologies for Light-Duty Vehicles

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309216389
Total Pages : 373 pages
Book Rating : 4.3/5 (92 download)

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Book Synopsis Assessment of Fuel Economy Technologies for Light-Duty Vehicles by : National Research Council

Download or read book Assessment of Fuel Economy Technologies for Light-Duty Vehicles written by National Research Council and published by National Academies Press. This book was released on 2011-06-03 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various combinations of commercially available technologies could greatly reduce fuel consumption in passenger cars, sport-utility vehicles, minivans, and other light-duty vehicles without compromising vehicle performance or safety. Assessment of Technologies for Improving Light Duty Vehicle Fuel Economy estimates the potential fuel savings and costs to consumers of available technology combinations for three types of engines: spark-ignition gasoline, compression-ignition diesel, and hybrid. According to its estimates, adopting the full combination of improved technologies in medium and large cars and pickup trucks with spark-ignition engines could reduce fuel consumption by 29 percent at an additional cost of $2,200 to the consumer. Replacing spark-ignition engines with diesel engines and components would yield fuel savings of about 37 percent at an added cost of approximately $5,900 per vehicle, and replacing spark-ignition engines with hybrid engines and components would reduce fuel consumption by 43 percent at an increase of $6,000 per vehicle. The book focuses on fuel consumption-the amount of fuel consumed in a given driving distance-because energy savings are directly related to the amount of fuel used. In contrast, fuel economy measures how far a vehicle will travel with a gallon of fuel. Because fuel consumption data indicate money saved on fuel purchases and reductions in carbon dioxide emissions, the book finds that vehicle stickers should provide consumers with fuel consumption data in addition to fuel economy information.

Gasoline Compression Ignition Technology

Author : Gautam Kalghatgi
Publisher : Springer Nature
ISBN 13 : 9811687358
Total Pages : 339 pages
Book Rating : 4.8/5 (116 download)

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Book Synopsis Gasoline Compression Ignition Technology by : Gautam Kalghatgi

Download or read book Gasoline Compression Ignition Technology written by Gautam Kalghatgi and published by Springer Nature. This book was released on 2022-01-17 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on gasoline compression ignition (GCI) which offers the prospect of engines with high efficiency and low exhaust emissions at a lower cost. A GCI engine is a compression ignition (CI) engine which is run on gasoline-like fuels (even on low-octane gasoline), making it significantly easier to control particulates and NOx but with high efficiency. The state of the art development to make GCI combustion feasible on practical vehicles is highlighted, e.g., on overcoming problems on cold start, high-pressure rise rates at high loads, transients, and HC and CO emissions. This book will be a useful guide to those in academia and industry.

Automotive Spark-Ignited Direct-Injection Gasoline Engines

Author : F. Zhao
Publisher : Elsevier
ISBN 13 : 008055279X
Total Pages : 129 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Automotive Spark-Ignited Direct-Injection Gasoline Engines by : F. Zhao

Download or read book Automotive Spark-Ignited Direct-Injection Gasoline Engines written by F. Zhao and published by Elsevier. This book was released on 2000-02-08 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of fuel injection, spray atomization and vaporization, charge cooling, mixture preparation and the control of in-cylinder air motion are all being actively researched and this work is reviewed in detail and analyzed. The new technologies such as high-pressure, common-rail, gasoline injection systems and swirl-atomizing gasoline fuel injections are discussed in detail, as these technologies, along with computer control capabilities, have enabled the current new examination of an old objective; the direct-injection, stratified-charge (DISC), gasoline engine. The prior work on DISC engines that is relevant to current GDI engine development is also reviewed and discussed. The fuel economy and emission data for actual engine configurations have been obtained and assembled for all of the available GDI literature, and are reviewed and discussed in detail. The types of GDI engines are arranged in four classifications of decreasing complexity, and the advantages and disadvantages of each class are noted and explained. Emphasis is placed upon consensus trends and conclusions that are evident when taken as a whole; thus the GDI researcher is informed regarding the degree to which engine volumetric efficiency and compression ratio can be increased under optimized conditions, and as to the extent to which unburned hydrocarbon (UBHC), NOx and particulate emissions can be minimized for specific combustion strategies. The critical area of GDI fuel injector deposits and the associated effect on spray geometry and engine performance degradation are reviewed, and important system guidelines for minimizing deposition rates and deposit effects are presented. The capabilities and limitations of emission control techniques and after treatment hardware are reviewed in depth, and a compilation and discussion of areas of consensus on attaining European, Japanese and North American emission standards presented. All known research, prototype and production GDI engines worldwide are reviewed as to performance, emissions and fuel economy advantages, and for areas requiring further development. The engine schematics, control diagrams and specifications are compiled, and the emission control strategies are illustrated and discussed. The influence of lean-NOx catalysts on the development of late-injection, stratified-charge GDI engines is reviewed, and the relative merits of lean-burn, homogeneous, direct-injection engines as an option requiring less control complexity are analyzed.

Study of Ignition in a Direct Injected, Compression Ignition Natural Gas Engine with Modified Hot Surfaces

Author : Mir Abbas Ali
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Study of Ignition in a Direct Injected, Compression Ignition Natural Gas Engine with Modified Hot Surfaces by : Mir Abbas Ali

Download or read book Study of Ignition in a Direct Injected, Compression Ignition Natural Gas Engine with Modified Hot Surfaces written by Mir Abbas Ali and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ignition of direct injected natural gas coupled with modified glow plug ignition assist technologies was explored in a single cylinder, optically accessible, compression ignition engine. The geometric effects of injector nozzle tip and glow plug shield opening orientation were significant due to the presence of a small window of combinations that produce repeatable combustion. A novel diamond pattern glow plug shield design was implemented and compared to the standard single hole shield design on the basis of ignition delay and engine performance. The ignition delay for the new shield design was found to be longer than the standard shield design due to engine swirl momentum aggravating poor fuel jet impingement on the glow plug shield surface. The longer ignition delay caused combustion with the diamond pattern shield to occur at longer durations in the engine cycle, resulting in a reduced degree of work output and fuel conversion efficiency.

Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309373913
Total Pages : 812 pages
Book Rating : 4.3/5 (93 download)

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Book Synopsis Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles by : National Research Council

Download or read book Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles written by National Research Council and published by National Academies Press. This book was released on 2015-09-28 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt: The light-duty vehicle fleet is expected to undergo substantial technological changes over the next several decades. New powertrain designs, alternative fuels, advanced materials and significant changes to the vehicle body are being driven by increasingly stringent fuel economy and greenhouse gas emission standards. By the end of the next decade, cars and light-duty trucks will be more fuel efficient, weigh less, emit less air pollutants, have more safety features, and will be more expensive to purchase relative to current vehicles. Though the gasoline-powered spark ignition engine will continue to be the dominant powertrain configuration even through 2030, such vehicles will be equipped with advanced technologies, materials, electronics and controls, and aerodynamics. And by 2030, the deployment of alternative methods to propel and fuel vehicles and alternative modes of transportation, including autonomous vehicles, will be well underway. What are these new technologies - how will they work, and will some technologies be more effective than others? Written to inform The United States Department of Transportation's National Highway Traffic Safety Administration (NHTSA) and Environmental Protection Agency (EPA) Corporate Average Fuel Economy (CAFE) and greenhouse gas (GHG) emission standards, this new report from the National Research Council is a technical evaluation of costs, benefits, and implementation issues of fuel reduction technologies for next-generation light-duty vehicles. Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles estimates the cost, potential efficiency improvements, and barriers to commercial deployment of technologies that might be employed from 2020 to 2030. This report describes these promising technologies and makes recommendations for their inclusion on the list of technologies applicable for the 2017-2025 CAFE standards.

Natural Gas Engines

Author : Kalyan Kumar Srinivasan
Publisher : Springer
ISBN 13 : 9811333076
Total Pages : 419 pages
Book Rating : 4.8/5 (113 download)

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Book Synopsis Natural Gas Engines by : Kalyan Kumar Srinivasan

Download or read book Natural Gas Engines written by Kalyan Kumar Srinivasan and published by Springer. This book was released on 2018-11-03 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the various advanced reciprocating combustion engine technologies that utilize natural gas and alternative fuels for transportation and power generation applications. It is divided into three major sections consisting of both fundamental and applied technologies to identify (but not limited to) clean, high-efficiency opportunities with natural gas fueling that have been developed through experimental protocols, numerical and high-performance computational simulations, and zero-dimensional, multizone combustion simulations. Particular emphasis is placed on statutes to monitor fine particulate emissions from tailpipe of engines operating on natural gas and alternative fuels.

High-pressure Direct-injection of Natural Gas with Entrained Diesel Into a Compression-ignition Engine

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (68 download)

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Book Synopsis High-pressure Direct-injection of Natural Gas with Entrained Diesel Into a Compression-ignition Engine by :

Download or read book High-pressure Direct-injection of Natural Gas with Entrained Diesel Into a Compression-ignition Engine written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The high-pressure direct-injection (HPDI) of natural gas in a compression ignition engine has the potential to reduce demand for petroleum derived fuels and significantly reduce the level of pollutants and greenhouse gases emitted from heavy duty transport vehicles. A new HPDI injector was tested where diesel is injected into a gas/diesel reservoir in the injector and the diesel and gas are then co-injected into the combustion chamber. In order to identify interactions between the diesel and gas in the reservoir, two different injector geometries were tested: prototypes A and B. Prototype B had reduced reservoir volume to increase gas velocity inside the injector. A majority of the tests were conducted in a single-cylinder test engine derived from a Cummins ISX diesel engine. As prototype A was being modified to create Prototype B this test engine was moved to a larger test cell. After updating the electrical, mechanical, and safety systems, the test engine in the new test cell was found to run repeatably; however, emissions comparisons between both test cells was not possible due to different analyzers being used. Single gas and double gas injections were conducted for both injector prototypes. The single gas injection tests found that increasing the diesel injection mass reduced the mass of gas injected. Increased diesel injection mass also shortened ignition delay, reduced unburned and partially burned fuel and increased NOx emissions. Holding the diesel injection mass constant and reducing the gas injection mass had the same effect as increasing diesel on ignition delay and gaseous emissions. If the diesel injection mass was kept constant and a second gas injection was added, the heat release due to the first injection decreased and the start of combustion was retarded. This appears to have occurred because some of the diesel was carried into the cylinder by the second injection and less diesel was available in the first injection to promote ignition. Double gas.

DESIGN, BUILD, AND ANALYSIS OF A COMPRESSED NATURAL GAS DIRECT INJECTION COMPRESSION IGNITION SINGLE CYLINDER RESEARCH ENGINE

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (124 download)

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Book Synopsis DESIGN, BUILD, AND ANALYSIS OF A COMPRESSED NATURAL GAS DIRECT INJECTION COMPRESSION IGNITION SINGLE CYLINDER RESEARCH ENGINE by :

Download or read book DESIGN, BUILD, AND ANALYSIS OF A COMPRESSED NATURAL GAS DIRECT INJECTION COMPRESSION IGNITION SINGLE CYLINDER RESEARCH ENGINE written by and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Both experimental and simulation efforts have been employed to further advance the design and build of a single cylinder research engine. The engine will aid in advancing technology and understanding the operation of compression-ignition (CI) engines using natural gas within the heavy-duty engine industry. The basis for the engine is a Cummins 15L ISX engine that has been modified, retrofitted, and instrumented to allow for late-cycle direct-injection of high-pressure compressed natural gas. Along with the engine build, a one-dimensional GT-Power simulation model has been created and used to analyze the engine operation and specify components including the engine compression ratio and charging system. The combustion model was calibrated to a kinetic combustion model at multiple speed load points in effort to understand the effect of compression ratio, temperature, and start of injection, on natural gas compression ignition.

Dual-Fuel Diesel Engines

Author : Ghazi A. Karim
Publisher : CRC Press
ISBN 13 : 1498703097
Total Pages : 312 pages
Book Rating : 4.4/5 (987 download)

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Book Synopsis Dual-Fuel Diesel Engines by : Ghazi A. Karim

Download or read book Dual-Fuel Diesel Engines written by Ghazi A. Karim and published by CRC Press. This book was released on 2015-03-02 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-Fuel Diesel Engines offers a detailed discussion of different types of dual-fuel diesel engines, the gaseous fuels they can use, and their operational practices. Reflecting cutting-edge advancements in this rapidly expanding field, this timely book:Explains the benefits and challenges associated with internal combustion, compression ignition,

Internal Combustion Engines

Author : Institution of Mechanical Engineers
Publisher : Elsevier
ISBN 13 : 0857095064
Total Pages : 285 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Internal Combustion Engines by : Institution of Mechanical Engineers

Download or read book Internal Combustion Engines written by Institution of Mechanical Engineers and published by Elsevier. This book was released on 2011-11-10 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the papers of the Internal Combustion Engines: Performance fuel economy and emissions conference, in the IMechE bi-annual series, held on the 29th and 30th November 2011. The internal combustion engine is produced in tens of millions per year for applications as the power unit of choice in transport and other sectors. It continues to meet both needs and challenges through improvements and innovations in technology and advances from the latest research. These papers set out to meet the challenges of internal combustion engines, which are greater than ever. How can engineers reduce both CO2 emissions and the dependence on oil-derivate fossil fuels? How will they meet the future, more stringent constraints on gaseous and particulate material emissions as set by EU, North American and Japanese regulations? How will technology developments enhance performance and shape the next generation of designs? This conference looks closely at developments for personal transport applications, though many of the drivers of change apply to light and heavy duty, on and off highway, transport and other sectors. Aimed at anyone with interests in the internal combustion engine and its challenges The papers consider key questions relating to the internal combustion engine

Numerical Simulation of Combustion and Unburnt Products in Dual-fuel Compression-ignition Engines with Multiple Injection

Author : Arash Jamali
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (958 download)

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Book Synopsis Numerical Simulation of Combustion and Unburnt Products in Dual-fuel Compression-ignition Engines with Multiple Injection by : Arash Jamali

Download or read book Numerical Simulation of Combustion and Unburnt Products in Dual-fuel Compression-ignition Engines with Multiple Injection written by Arash Jamali and published by . This book was released on 2015 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural gas substitution for diesel can result in significant reduction in pollutant emissions. Based on current fuel price projections, operating costs would be lower. With a high ignition temperature and relatively low reactivity, natural gas can enable promising approaches to combustion engine design. In particular, the combination of low reactivity natural gas and high reactivity diesel may allow for optimal operation as a reactivity-controlled compression ignition (RCCI) engine, which has potential for high efficiency and low emissions. In this computational study, a lean mixture of natural gas is ignited by direct injection of diesel fuel in a model of the heavy-duty CAT3401 diesel engine. Dual-fuel combustion of natural gas-diesel (NGD) may provide a wider range of reactivity control than other dual-fuel combustion strategies such as gasoline-diesel dual fuel. Accurate and efficient combustion modeling can aid NGD dual-fuel engine control and optimization. In this study, multi-dimensional simulation was performed using a nite-volume computational code for fuel spray, combustion and emission processes. Adaptive mesh refinement (AMR) and multi-zone reaction modeling enables simulation in a reasonable time. The latter approach avoids expensive kinetic calculations in every computational cell, with considerable speedup. Two approaches to combustion modeling are used within the Reynolds averaged Navier-Stokes (RANS) framework. The first approach uses direct integration of the detailed chemistry and no turbulence-chemistry interaction modeling. The model produces encouraging agreement between the simulation and experimental data. For reasonable accuracy and computation cost, a minimum cell size of 0.2 millimeters is suggested for NGD dual-fuel engine combustion. In addition, the role of different chemical reaction mechanism on the NGD dual-fuel combustion is considered with this model. This work considers fundamental questions regarding combustion in NGD dual-fuel combustion, particularly about how and where fuels react, and the difference between combustion in the dual fuel mode and conventional diesel mode. The results show that in part-load working condition main part of CH4 cannot burn and it has significant effect in high level of HC emission in NGD dual-fuel engine. The CFD results reveal that homogeneous mixture of CH4 and air is too lean, and it cannot ignite in regions that any species from C7H16 chemical mechanism does not exist. It is shown that multi-injection of diesel fuel with an early main injection can reduce HC emission significantly in the NGD dual-fuel engine. In addition, the results reveal that increasing the air fuel ratio by decreasing the air amount could be a promising idea for HC emission reduction in NGD dual-fuel engine, too.