Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions : Part 1 Combustion Modeling
TLDR
In this article, a mathematical model of spray combustion in direct-injection diesel engines was developed to predict engine performance, thermal efficiency and pollutant emissions, considering the complete air-fuel jet mixing process and temperature in each package.Abstract:
A mathematical model of a spray combustion in direct-injection diesel engines has been developed to predict engine performance, thermal efficiency and pollutant emissions. Injected fuel spray was divided into many small packages. Gas and fuel droplet temperatures and evaporated mass of fuel in each package were computed. In considering the complete air-fuel jet mixing process and temperature in each package, the model also enabled subsequent spatial and temporal history of burning rate, local temperature and air-fuel ratio to be calculated.read more
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Journal ArticleDOI
Fuel droplet vaporization and spray combustion theory
TL;DR: A critical review of modern theoretical developments on problems of droplet vaporization in a high-temperature environment and of spray combustion is presented in this paper, with some mention of empirical evidence.
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Experimental and Numerical Study
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Effect of exhaust gas recirculation (EGR) temperature for various EGR rates on heavy duty DI diesel engine performance and emissions
TL;DR: In this article, the effect of cooled EGR gas temperature level for various EGR percentages on performance and emissions of a turbocharged DI heavy duty diesel engine operating at full load was examined, using a multi-zone combustion model.
Proceedings ArticleDOI
Multi-Zone DI Diesel Spray Combustion Model for Cycle Simulation Studies of Engine Performance and Emissions
Dohoy Jung,Dennis N. Assanis +1 more
Abstract: A quasi -dimensional, multi-zone, direct injection (DI) diesel combustion model has been developed and implemented in a full cycle simulation of a turbocharged engine. The combustion model accounts for transient fuel spray evolution, fuel-air mixing, ignition, combustion and NO and soot pollutant formation. In the model, the fuel spray is divided into a number of zones, which are treated as open systems. While mass and energy equations are solved for each zone, a simplified momentum conservation equation is used to ca lculate the amount of air entrained into each zone. Details of the DI spray, combustion model and its implementation into the cycle simulation of Assanis and Heywood [1] are described in this paper. The model is validated with experimental data obtained in a constant volume chamber and engines. First, predictions of spray penetration and spray angle are validated against measurements in a pressurized constant volume chamber. Subsequently, predictions of heat release rate, as well as NO and soot emissions are compared with experimental data obtained from representative heavy-duty, turbocharged diesel engines. It is demonstrated that the model can predict the rate of heat release and engine performance with high fidelity. However, additional effort is require d to enhance the fidelity of NO and soot predictions across a wide range of operating conditions.
Journal ArticleDOI
A Predictive Ignition Delay Correlation Under Steady-State and Transient Operation of a Direct Injection Diesel Engine
TL;DR: In this paper, an ignition delay correlation was developed based on engine data, which is suitable for predictions under both steady-state and transient conditions, using a modified Arrhenius expression to account for variations in fuel/air composition during transients.