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Experiments And Computational Predictions Of Thermal Energy Flows Occurring Within A Spark Ignited Homogeneous Charge Four Stroke Air Cooled Engine
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Book Synopsis Experiments and Computational Predictions of Thermal Energy Flows Occurring Within a Spark Ignited, Homogeneous Charge, Four Stroke, Air-cooled Engine by : Jay Elliott Strucel
Download or read book Experiments and Computational Predictions of Thermal Energy Flows Occurring Within a Spark Ignited, Homogeneous Charge, Four Stroke, Air-cooled Engine written by Jay Elliott Strucel and published by . This book was released on 2000 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Piston Heat Transfer in an Air-cooled Engine by : Terry Joseph Dembroski
Download or read book Piston Heat Transfer in an Air-cooled Engine written by Terry Joseph Dembroski and published by . This book was released on 2002 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Fuel Film Effects in a Small Air-cooled Utility Engine by : Forrest Auchmuty Jehlik
Download or read book Investigation of Fuel Film Effects in a Small Air-cooled Utility Engine written by Forrest Auchmuty Jehlik and published by . This book was released on 2000 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Air Fuel Ratio and Ignition Timing on Thermal Loading and Engine Performance of a Spark Ignited, Homogeneous Charged, Four Stroke, Air-cooled Engine by : Brian P. Boyce
Download or read book Effect of Air Fuel Ratio and Ignition Timing on Thermal Loading and Engine Performance of a Spark Ignited, Homogeneous Charged, Four Stroke, Air-cooled Engine written by Brian P. Boyce and published by . This book was released on 1998 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine by : Yajuvendra Shekhawat
Download or read book Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine written by Yajuvendra Shekhawat and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cycle-to-cycle variations (CCV) of flow and combustion in internal combustion engines (ICE) limit their fuel efficiency and emissions potential. Large-eddy simulation (LES) is the most practical simulation tool to understand the nature of these CCV. In this research, multi-cycle LES of a two-valve, four-stroke, spark-ignition optical engine has been performed for motored and fired operations. The LES mesh quality is assessed using a length scale resolution parameter and a energy resolution parameter. For the motored operation, two 50-consecutive-cycle LES with different turbulence models (Smagorinsky model and dynamic structure model) are compared with the experiment. The pressure comparison shows that the LES is able to capture the wave-dynamics in the intake and exhaust ports. The LES velocity fields are compared with particle-image velocimetry (PIV) measurements at three cutting planes. Based on the structure and magnitude indices, the dynamic structure model is somewhat better than the Smagorinsky model as far asthe ensemble-averaged velocity fields are concerned. The CCV in the velocity fields is assessed by proper-orthogonal decomposition (POD). The POD analysis shows that LES is able to capture the level of CCV seen in the experiment. For the fired operation, two 60-cycle LES with different combustion models (thickened flame model and coherent flame model) are compared with experiment. The in-cylinderpressure and the apparent heat release rate comparison shows higher CCV for LES compared to the experiment, with the thickened flame model showing higher CCV than the coherent flame model. The correlation analysis for the LES using thickened flame model shows that the CCV in combustion/pressure is correlated with: the tumble at the intake valve closing, the resolved and subfilter-scale kinetic energy just before spark time, and the second POD mode (shear flow near spark gap) of the velocity fields just before spark time.
Book Synopsis Computational Fluid Dynamic Modelling of Flow and Combustion in Spark Ignition Engines by :
Download or read book Computational Fluid Dynamic Modelling of Flow and Combustion in Spark Ignition Engines written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work is based on the need for understanding the in-cylinder flow and its subsequent effects on combustion in a valved-two-stroke spark ignition engine with fuel injection using Computational Fluid Dynamics (CFD) and experimental techniques. In this context, the CFD code KIVA-II has been modified to model the two-stroke engine gas exchange and combustion processes. A 3-D Cartesian grid generation program for complex engine geometry has been added to the KIVA code which has been modified to include intake and exhaust flow processes with valves. New and improved sub models for wall jet interaction, mixing controlled combustion and one dimensional wave action have also been incorporated. The modified version of the program has been used to simulate a fuel injected two-stroke spark ignition engine and parametric studies have been undertaken. The simulated flow, combustion and exhaust emission characteristics over a wide range of operating conditions show the expected trends in behaviour observed in actual engines. In the second phase of this study, the air-assisted-fuel-injection (AAFI) process into a cylinder has been simulated with a high resolution computational grid. The simulation results are presented and compared with experimental data obtained using the Schlieren optical technique. An approximate method based on the conservation of mass, momentum and energy of the spray jet and using a comparatively coarse grid has been suggested for simulating the AAFI process. The simulation study predicts a high degree of atomisation of fuel spray with Sauter mean diameter around 10 μm even with moderate air and fuel pressures. The penetration and width of spray are simulated within 15% of the experimental values. In the last phase of this study, the flow and combustion processes have been studied for a four-stroke spark ignition engine with the AAFI process. The simulation results obtained using this approximate method have been validated with experimental data ge.
Book Synopsis Computational and Experimental Models of Induction Flows in Spark-ignition Engines by :
Download or read book Computational and Experimental Models of Induction Flows in Spark-ignition Engines written by and published by . This book was released on 1903 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis is to combine computational flow modelling, flow visualization and point measurements of mean flow and turbulence properties to obtain a better, more detailed, understandýing of the effects of alternative throttling devices on mixture preparation and turbulence generation in spark ignition engines. In so doing, it also seeks to assess the wider diagnostic potential of flow field computational techniques in internal combustion engine designs. Full-scale models, comprising simplified representations of the induction tract, throttling device, inlet valve and cylinder, have been manufactured in Perspex for steady-state water analogy tests. The resulting photographs of flow tracers in a variety of viewing planes provide a clear, but qualitative, picture of the princi - pal features of the flow in the models under study. The essentially qualitative data obtained from water analogy tests are complemented by limited hot wire velocity measurements at particular stations in the Perspex models, with air replacing the water as the flow medium. These data, supplemented by information in the literature, provide the framework for comparisons with an extensive computational simulation of induction flows which are performed using the general purpose PHOENICS code developed by CHAM. These studies include both transient and steady state predictions. The statistically stationary turbulent flow field through alternative induction system throttling devices -a conventional butterfly valve and a variable geometry ramp restriction- are modelled computationally and compared with water analogy flow visualization. The principal flow field characteristics are satisfactorily reproduced, including in particular the extent of the recirculation zone in the lee of the throttle and the relative persistence of the turbulence generated downstream for varying throat apertures. That generated by the two-dimensional variable geometry ramp is predicted to be both higher and per.
Book Synopsis Introduction to Modeling and Control of Internal Combustion Engine Systems by : Lino Guzzella
Download or read book Introduction to Modeling and Control of Internal Combustion Engine Systems written by Lino Guzzella and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal combustion engines still have a potential for substantial improvements, particularly with regard to fuel efficiency and environmental compatibility. These goals can be achieved with help of control systems. Modeling and Control of Internal Combustion Engines (ICE) addresses these issues by offering an introduction to cost-effective model-based control system design for ICE. The primary emphasis is put on the ICE and its auxiliary devices. Mathematical models for these processes are developed in the text and selected feedforward and feedback control problems are discussed. The appendix contains a summary of the most important controller analysis and design methods, and a case study that analyzes a simplified idle-speed control problem. The book is written for students interested in the design of classical and novel ICE control systems.
Book Synopsis Computational and Experimental Models of Induction Flows in Spark-ignition Engines by : R. Sanatian
Download or read book Computational and Experimental Models of Induction Flows in Spark-ignition Engines written by R. Sanatian and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Experimental Investigations on Emissions and Power Predictions in a Four Stroke Cylinder Spark Ignition Engine Including Wave Action by : T. Saito
Download or read book Theoretical and Experimental Investigations on Emissions and Power Predictions in a Four Stroke Cylinder Spark Ignition Engine Including Wave Action written by T. Saito and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time- and Space-resolved Heat Transfer Model for Spark-ignition Engines by : Smarajit Mukherjee
Download or read book Time- and Space-resolved Heat Transfer Model for Spark-ignition Engines written by Smarajit Mukherjee and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In view of the ever-increasing consumption of non-renewable vehicular fuels, it is imperative to continually improve the efficiency of Spark-Ignition (SI) engines, which power majority of the light duty vehicles in the US. Increasing the compression ratio is a well-established approach for developing fuel-efficient SI engines. However, the potential benefits of this approach are limited by engine knock, which is driven by the temperature-dependent chemical kinetics of combustion. In combination with the energy released from combustion, in-cylinder heat transfer dictates the magnitude of in-cylinder gas temperatures, thus defining the efficiency and performance of an SI engine. One-dimensional (1D) simulation tools are extensively used in the automotive industry to predict engine performance. In-cylinder heat transfer is calculated within such codes using empirical correlations originally formulated to compute the heat transfer coefficient for turbulent flow within pipes. The turbulent flow field within the combustion chamber interacts with the propagating flame front (during combustion). Consequently, the resulting flow physics is significantly more involved compared to turbulent flow within pipes. Applying a pipe-flow based correlation to estimate in-cylinder heat transfer misrepresents the actual physics, resulting in unreliable heat transfer predictions. Hence, the objective of this work is to address this deficiency by developing a fundamental 1D engine heat transfer model, which is well-grounded in the governing flow physics.
Book Synopsis An Experimental and Computational Analysis of the Flow Field in a Four-valve Spark Ignition Engine by : Jean-François le Coz
Download or read book An Experimental and Computational Analysis of the Flow Field in a Four-valve Spark Ignition Engine written by Jean-François le Coz and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computer Simulation of Spark Ignited Reciprocating Engine Processes by : Michael Barry Rubin
Download or read book Computer Simulation of Spark Ignited Reciprocating Engine Processes written by Michael Barry Rubin and published by . This book was released on 1975 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Homogeneous Charge Compression Ignition in Four-stroke Internal Combustion Engines by : George A. Kontarakis
Download or read book Homogeneous Charge Compression Ignition in Four-stroke Internal Combustion Engines written by George A. Kontarakis and published by . This book was released on 2001 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Intake Charge Temperature and EGR Stratification Effects on HCCI Combustion by : Angelo P. Chialva
Download or read book Analysis of Intake Charge Temperature and EGR Stratification Effects on HCCI Combustion written by Angelo P. Chialva and published by . This book was released on 2006 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Model for Heat Transfer and Combustion in Spark Ignited Engines and Its Comparison with Experiments by : T. Morel
Download or read book Model for Heat Transfer and Combustion in Spark Ignited Engines and Its Comparison with Experiments written by T. Morel and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
