Multi-Component Model of Diesel Sprays Under High Injection Pressure

The combustion efficiency of a diesel engine depends not only on spray characteristics but also on fuel-air mixing characteristics. Based on the original spray model, a new spray model is established in this paper to accurately predict the diesel spray, and then a multi-component evaporation model is added into it. The model takes the influence of component concentration gradient and species on its evaporation rate in the liquid phase into account. This paper studies the spray characteristics (spray penetration, spray angle and spray morphology) and fuel-air mixing characteristics (spray area, spray volume and air entrainment mass) using the spray model, and the results are compared with the experimental results. The comparison shows that the simulated spray penetration and spray angle are close to the experimental results with the average deviations less than 3%. Moreover, this paper studies the spray area, spray volume and air entrainment using empirical formula under different conditions. And the maximum deviations of the spray volume, spray area and air entrainment mass are less than 5% as compared with the test values. Overall, this spray model can predict the diesel spray characteristics and fuel-air mixing characteristics under high injection pressure accurately.     

基于铝合金一体高压压铸成型技术的轿车侧围结构件研究

本文旨在研究轿车侧围结构件铝合金一体高压压铸成型的性能。通过结构性能分析和回归分析，确定了铝合金一体高压压铸成型的最佳参数。结构性能分析结果表明，采用铝合金一体高压压铸成型制造的轿车侧围结构件具有较高的强度和韧性，并且具有较低的重量和成本。回归分析表明，成型参数对轿车侧围结构件的强度和韧性具有显著影响。本研究对铝合金一体高压压铸成型在轿车侧围结构件制造中的应用具有重要的理论和实际意义。