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《Diesel Engine》 2019-05
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A Phenomenological Fast Prediction Combustion Model for Direct Injection Diesel Engine

Meng Wei;Deng Kangyao;Key Laboratory for Power Machinery & Engineering of Ministry of Education, Shanghai Jiao Tong University;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration;  
In order to predict the heat release and emission for direct injection diesel engine quickly and precisely, a phenomenological fast prediction combustion model for direct injection diesel engine was proposed. The model is based on a gas phase jet spray model, and divides the diesel combustion process into three steps including premixed combustion, diffusion combustion during injection and diffusion combustion after injection to calculate the combustion, and calculates the emission by dividing the spray zone to burned zone and unburned zone. Comparing to multi-zone combustion model, the model simplifies partition and considers the influence of turbulence energy from injection. In rated speed, comparing the results of prediction calibrated by 90% load working condition with the experiment results of Weichai WP7 diesel engine on other loads, the errors of both detonation pressure and mean pressure are less than 5%, the tendency of heat release rate on medium and high load is basically the same, the error of CA10 is less than 0.6 °CA, the error of CA90 is less than 5 °CA, the error of emission prediction on high load is about 5%, the computation can be completed within several seconds. As the results show, the phenomenological combustion model can predict the combustion in direct injection diesel engine on medium and high load rapidly and exactly.
【CateGory Index】: TK421.2
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【Citations】
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【Co-citations】
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