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RISEffect of Optimization Criteria on Direct-Injection Homegeneous Charge Compression Ignition Gasoline Engine Performance and Emissions Using Fully Automated Experiments and Microgenetic Algorithms
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Homogeneous charge compression ignition (HCCI) is a new low-emission engine concept. Combustion under homogeneous, low equivalence ratio conditions results in modest temperature combustion products, ...
Response Surface Method Optimization of a High-Speed Direct-Injection Diesel Engine Equipped With a Common Rail Injection System
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: To overcome the tradeoff between NOx and particulate emissions for future diesel vehicles and engines it is necessary to seek methods to lower pollutant emissions. The desired simultaneous ...
Multidimensional Modeling of Diesel Ignition and Combustion Using a Multistep Kinetics Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Ignition and combustion mechanisms in diesel engines were studied using the KIVA code, with modifications to the combustion, heat transfer, crevice flow, and spray models. A laminar-and-turbulent ...
A Numerical Analysis of the Emissions Characteristics of Biodiesel Blended Fuels
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Computer simulations were conducted to study the combined effects of methyl soyate (biodiesel) blends with no. 2 diesel fuel on diesel engine (D.I.) performance. Diesel engine emissions and heat ...
Engine Fuel Droplet High-Pressure Vaporization Modeling
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The objective of this investigation was to characterize the high-pressure vaporization processes of engine fuels, which are too complex in composition to be described with conventional methods. ...
Multidimensional Modeling of Combustion for a Six-Mode Emissions Test Cycle on a DI Diesel Engine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Numerical simulations of direct injection (DI) heavy-duty diesel engine combustion over the entire engine operating range were conducted using the KIVA code, with modifications to the spray, ...
Modeling the Effects of Variable Intake Valve Timing on Diesel HCCI Combustion at Varying Load, Speed, and Boost Pressures
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Homogeneous charge compression ignition (HCCI) operated engines have the potential to provide the efficiency of a typical diesel engine, with very low NOx and particulate matter emissions. However, ...
Use of Detailed Chemical Kinetics to Study HCCI Engine Combustion With Consideration of Turbulent Mixing Effects
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Detailed chemical kinetics was used in an engine CFD code to study the combustion process in HCCI engines. The CHEMKIN code was implemented in KIVA such that the chemistry and flow solutions ...
A Nonequilibrium Turbulence Dissipation Correction and Its Influence on Pollution Predictions for DI Diesel Engines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A correction for the turbulence dissipation rate, based on nonequilibrium turbulence considerations from rapid distortion theory, has been derived and implemented in combination with the RNG k-ε ...