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Author :
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (924 download)
Download or read book Effects of Injection Orifice Shape on Diesel Spray Combustion written by and published by . This book was released on 1999 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (684 download)
Download or read book Effects of Injector Conditions on the Flame Lift-Off Length of DI Diesel Sprays written by and published by . This book was released on 2000 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of injection pressure and orifice diameter on the lift-off length of a direct-injection (DI) diesel spray (defined as the farthest upstream location of high temperature combustion) were investigated using a natural light emission imaging technique. The lift-off length experiments were conducted in a constant-volume combustion vessel under quiescent, heavy-duty DI diesel engine conditions using a Phillips research grade No. 2 diesel fuel. The results show that natural light emission at 310 nm provides an excellent marker of the lift-off length. At this location, natural light emission at 310 nm is dominated by OH chemiluminescence generated by high-temperature combustion chemistry. Lift-off lengths determined from images of natural light emission at 310 nm show that as either injection pressure (i.e., injection velocity) or orifice diameter increase, the lift-off length increases. The observed lift-off length increase was linearly dependent on injection velocity, the same dependency as previously noted for gas jets. The lift-off length increase with increasing orifice diameter, however, is different than the independence of lift-off length on orifice diameter noted for gas jets An important overall observation was made by considering the lift-off length data in conjunction with data from recent investigations of liquid-phase fuel penetration and spray development. The combined data suggests that a systematic evolution of the relationship and interaction between various processes in a DI diesel spray has been occurring over time, as injection pressures have been increased and orifice diameters reduced as part of efforts to meet emissions regulations. The trends observed may eventually help explain effects of parameters such as injection pressure and orifice diameter on emissions.
Author : Harmit Juneja
Publisher :
ISBN 13 :
Total Pages : 328 pages
Book Rating : 4.:/5 (89 download)
Download or read book Injection Rate-shape Optimization as a Means of Controlling Comustion of Diesel Sprays written by Harmit Juneja and published by . This book was released on 2003 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ahmad Aizuddin Faiz Che Jaafar
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (953 download)
Download or read book A Study of the Spray Characteristic for Valve Covered Orifice Diesel Nozzle Injector Using CFD written by Ahmad Aizuddin Faiz Che Jaafar and published by . This book was released on 2013 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diesel engine performance and emissions are strongly coupled with fuel atomization and spray processes, which in turn are strongly influenced by injector flow dynamics. Modern engines employ micro-orifice with different orifice designs. It is critical to characterize the effects of various designs on engine performance and emissions. Spray characteristic of diesel fuel injection is one of the most important factors in diesel combustion and pollutant emissions where the interval between the onset of combustion and the evaporation of atomized fuel is relatively short. Therefore, this project is to study the spray simulation of diesel fuel using valve covered orifice (VCO) nozzle injector in the closed chamber. Three main components are focused on this paper, first is the relation between the spray characteristic influences of the various ambient temperature,. The second focus is the influences of the injection pressure,to the spray characteristic and the third focus is relation between the various diameter of nozzle hole size to the spray characteristic. Good spray characteristic leads to the good drivability, high combustion efficiency and stoichiometric air-fuel mixture. Therefore,Computational Fluid Dynamics (CFD) method using ANSYS Fluent simulation software is used for this purpose. The simulation of injection spray in chamber is conducted by using diesel fuel with the single and double-hole Valve Covered Orifice (VCO) nozzle, injection pressure, were various in range 5 KPa - 150 MPa, the ambient pressure, at atmosphere pressure at 101.325 Pa, the ambient temperature,was various in range of 273 K - 1000 K and at the same time iteration.
Author : Seunghyun Baik
Publisher :
ISBN 13 :
Total Pages : 168 pages
Book Rating : 4.:/5 (89 download)
Download or read book Development of Micro-diesel Injector Nozzles Via Mems Technology and Effects on Spray Characteristics written by Seunghyun Baik and published by . This book was released on 2001 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniel K. Mather
Publisher :
ISBN 13 :
Total Pages : 538 pages
Book Rating : 4.:/5 (89 download)
Download or read book Modeling the Effects of Auxiliary Gas Injection and Fuel Injection Rate Shape on Diesel Engine Combustion and Emissions written by Daniel K. Mather and published by . This book was released on 1998 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert Paul Borthwick
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (89 download)
Download or read book Fuel Injection Spray and Combustion Chamber Wall Impingement in Large Bore Industrial Diesel Engines written by Robert Paul Borthwick and published by . This book was released on 2000 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark Andrew Patterson
Publisher :
ISBN 13 :
Total Pages : 474 pages
Book Rating : 4.:/5 (89 download)
Download or read book Modeling the Effects of Fuel Injection Characteristics on Diesel Combustion and Emissions written by Mark Andrew Patterson and published by . This book was released on 1997 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christopher William Nilsen
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.6/5 (985 download)
Download or read book Characterization of the Effects of Ducted Fuel Injection in a Compression Ignition Engine written by Christopher William Nilsen and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ducted fuel injection (DFI) has been proposed as a strategy to enhance the fuel/charge-gas mixing within the combustion chamber of a direct-injection mixing-controlled compression-ignition engine. The concept involves injecting each fuel spray through a small tube within the combustion chamber to facilitate the creation of a leaner mixture in the autoignition zone, relative to a conventional free-spray configuration (i.e., a fuel spray that is not surrounded by a duct). This dissertation investigates the effects of ducted fuel injection on engine-out emissions and efficiency with two-orifice and four-orifice injector tips across a wide range of conditions. A numerical study contributes to the understanding of the fluid flow effects of DFI. The experiments in chapter two use a two-orifice fuel injector to test two duct configurations relative to conventional diesel combustion. The result is that DFI is confirmed to be effective at curtailing engine-out soot emissions. It also breaks the tradeoff between emissions of soot and nitrogen oxides (NO[subscript x]) by simultaneously attenuating soot and NO[subscript x] with increasing dilution. The third chapter expands on the second by comparing ducted fuel injection to conventional diesel combustion over a wide range of operating conditions and at higher loads (up to 8.7 bar gross indicated mean effective pressure) with a four-orifice fuel injector. This chapter is achieved through sweeps of intake-oxygen mole-fraction, injection duration, intake pressure, start of combustion timing, fuel-injection pressure, and intake temperature. Ducted fuel injection is shown to curtail engine-out soot emissions at all tested conditions. Under certain conditions, ducted fuel injection can attenuate engine-out soot by over a factor of 100. In addition to producing significantly lower engine-out soot emissions, ducted fuel injection enables the engine to be operated at low-NO[subscript x] conditions that are not feasible with conventional diesel combustion due to high soot emissions. The fourth chapter explores 1.1 bar IMEP[subscript g] (low load) conditions and 10 bar IMEP[subscript g] (higher-load) conditions with the same four-orifice fuel injector as in chapter three. DFI and CDC are directly compared at each operating point in the study. At the idle condition, the intake dilution was swept to elucidate the soot and NO[subscript x] performance of DFI in this new load range. This expands the range of conditions over which DFI has been shown to attenuate soot formation. It also shows that DFI enables low-NO[subscript x], low-load operation that is not achievable with CDC due to excessive soot formation at high dilution levels. The fifth chapter uses a numerical model to develop the understanding of the fluid flow effects of DFI. This enabled studies of entrainment and mixing that would have been much more challenging to do in an experiment. This showed that DFI enhances charge gas entrainment before the duct and blocks entrainment inside of the duct. Mixing is enhanced by the duct, which resulted in lower peak equivalence ratios at the end of the duct.
Author : Tzay-Fa Su
Publisher :
ISBN 13 :
Total Pages : 522 pages
Book Rating : 4.:/5 (89 download)
Download or read book An Experimental Study of High Injection Pressure Diesel Sprays written by Tzay-Fa Su and published by . This book was released on 1995 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. A. Lakshminarayanan
Publisher : Springer Science & Business Media
ISBN 13 : 904813885X
Total Pages : 313 pages
Book Rating : 4.0/5 (481 download)
Download or read book Modelling Diesel Combustion written by P. A. Lakshminarayanan and published by Springer Science & Business Media. This book was released on 2010-03-03 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phenomenology of Diesel Combustion and Modeling Diesel is the most efficient combustion engine today and it plays an important role in transport of goods and passengers on land and on high seas. The emissions must be controlled as stipulated by the society without sacrificing the legendary fuel economy of the diesel engines. These important drivers caused innovations in diesel engineering like re-entrant combustion chambers in the piston, lower swirl support and high pressure injection, in turn reducing the ignition delay and hence the nitric oxides. The limits on emissions are being continually reduced. The- fore, the required accuracy of the models to predict the emissions and efficiency of the engines is high. The phenomenological combustion models based on physical and chemical description of the processes in the engine are practical to describe diesel engine combustion and to carry out parametric studies. This is because the injection process, which can be relatively well predicted, has the dominant effect on mixture formation and subsequent course of combustion. The need for improving these models by incorporating new developments in engine designs is explained in Chapter 2. With “model based control programs” used in the Electronic Control Units of the engines, phenomenological models are assuming more importance now because the detailed CFD based models are too slow to be handled by the Electronic Control Units. Experimental work is necessary to develop the basic understanding of the pr- esses.
Author : Harmohindar Singh
Publisher :
ISBN 13 :
Total Pages : 103 pages
Book Rating : 4.:/5 (227 download)
Download or read book Modeling of Spray Combustion in Direct Injection Diesel Engine written by Harmohindar Singh and published by . This book was released on 1988 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mathematical model has been developed to predict the penetration of a transient fuel spray, the temporal and spatial distribution of air fuel mixture before the end of ignition delay and the subsequent pressure rise during combustion in a Direct Injection Diesel Engine with and without swirl. The model accounts for the non-isothermal and non-isobaric character of processes during fuel injection resulting from continuous motion of the piston. The effects of various engine operating variables on spray have been studied and graphically presented. The calculated spray penetration with and without crossflow of air has been compared with the available experimental data of other researchers and good agreement between the two is noticed. The model can predict the rate of combustible mixture formation, the rate of heat release and cylinder pressure as a function of time in direct injection (DI) diesel engine. A single cylinder D.I. research diesel engine was operated with N-hexadecane as the engine fuel to validate the mathematical model. However, a leaking head gasket rendered the data unusable, so comparisons between modeled and measured cylinder pressure rise data are not included in this report.
Author : Erica Lynn Blobaum
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.:/5 (89 download)
Download or read book Quantification of Spray Characteristics Associated with Unique Diesel Injector Nozzles written by Erica Lynn Blobaum and published by . This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Guangyao Ouyang
Publisher : John Wiley & Sons
ISBN 13 : 1119107245
Total Pages : 376 pages
Book Rating : 4.1/5 (191 download)
Download or read book Common Rail Fuel Injection Technology in Diesel Engines written by Guangyao Ouyang and published by John Wiley & Sons. This book was released on 2019-04-08 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide-ranging and practical handbook that offers comprehensive treatment of high-pressure common rail technology for students and professionals In this volume, Dr. Ouyang and his colleagues answer the need for a comprehensive examination of high-pressure common rail systems for electronic fuel injection technology, a crucial element in the optimization of diesel engine efficiency and emissions. The text begins with an overview of common rail systems today, including a look back at their progress since the 1970s and an examination of recent advances in the field. It then provides a thorough grounding in the design and assembly of common rail systems with an emphasis on key aspects of their design and assembly as well as notable technological innovations. This includes discussion of advancements in dual pressure common rail systems and the increasingly influential role of Electronic Control Unit (ECU) technology in fuel injector systems. The authors conclude with a look towards the development of a new type of common rail system. Throughout the volume, concepts are illustrated using extensive research, experimental studies and simulations. Topics covered include: Comprehensive detailing of common rail system elements, elementary enough for newcomers and thorough enough to act as a useful reference for professionals Basic and simulation models of common rail systems, including extensive instruction on performing simulations and analyzing key performance parameters Examination of the design and testing of next-generation twin common rail systems, including applications for marine diesel engines Discussion of current trends in industry research as well as areas requiring further study Common Rail Fuel Injection Technology is the ideal handbook for students and professionals working in advanced automotive engineering, particularly researchers and engineers focused on the design of internal combustion engines and advanced fuel injection technology. Wide-ranging research and ample examples of practical applications will make this a valuable resource both in education and private industry.
Author : Rene Thygesen
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832530932
Total Pages : 157 pages
Book Rating : 4.8/5 (325 download)
Download or read book Development of a Partially Premixed Combustion Model for a Diesel Engine Using Multiple Injection Strategies written by Rene Thygesen and published by Logos Verlag Berlin GmbH. This book was released on 2012 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to fulfil future emissions legislations, new combustion systems are to be investigated. One way of improving exhaust emissions is the application of multiple injection strategies and conventional or partially premixed combustion conditions to a Diesel engine. The application of numerical techniques as CFD supports and improves the quality of engine developments. Unfortunately, current spray and combustion models are not accurate enough to simulate multiple injection systems, being in this way a topic of research. The goal of this study was the development of a novel simulation method for the investigation of Diesel engines operated with multiple injection strategies and different combustion modes. The first part of this work focused in improving the spray modelling. The inform ation of 3D CFD simulations of the injector nozzle was introduced in the spray simulation as boundary conditions developing coupling subroutines for this issue. The atomisation modelling was also improved using validated presumed droplet size distributions. Moreover, to avoid the simulation of the injector nozzle for every investigated operating point, a novel interpolating tool was developed in order to create spray boundary conditions based on few 3D CFD simulations of the nozzle under certain initial and boundary conditions. The second part of this thesis dealt with the combustion modelling of Diesel engines. For this issue, a laminar flamelet approach called Representative Interactive Flamelet model (RIF) was selected and implemented. Afterwards, an extended combustion model based on RIF was developed in order to take into account multiple injection strategies. Finally, this new model was validated with a wide range of operating points: applying multiple injection strategies under conventional and partially premixed combustion conditions.
Author : Xianguo Li
Publisher : Springer Nature
ISBN 13 : 9811969450
Total Pages : 1062 pages
Book Rating : 4.8/5 (119 download)
Download or read book Emerging Trends in Mechanical and Industrial Engineering written by Xianguo Li and published by Springer Nature. This book was released on 2023-01-01 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the select proceedings of the International Conference on Emerging Trends in Mechanical and Industrial Engineering (ICETMIE 2022). It covers the latest trends in the area of mechanical engineering. The broad topics covered in the book are engineering design, industrial and production engineering, Industry 4.0, energy and process engineering, mechatronics, control and robotics, material science, and automotive engineering. The book is useful for students, researchers, and professionals working in the various areas of mechanical engineering.
Author : G.S. Settles
Publisher : Springer Science & Business Media
ISBN 13 : 3642566405
Total Pages : 388 pages
Book Rating : 4.6/5 (425 download)
Download or read book Schlieren and Shadowgraph Techniques written by G.S. Settles and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Schlieren and shadowgraph techniques are basic and valuable tools in various scientific and engineering disciplines. They allow us to see the invisible: the optical inhomogeneities in transparent media like air, water, and glass that otherwise cause only ghostly distortions of our normal vision. These techniques are discussed briefly in many books and papers, but there is no up-to-date complete treatment of the subject before now. The book is intended as a practical guide for those who want to use these methods, as well as a resource for a broad range of disciplines where scientific visualization is important. The colorful 400-year history of these methods is covered in an extensive introductory chapter accessible to all readers.
