柴油机高压进气流动模拟中的湍流模型应用研究  

Application Investigation of Different Turbulent Models on High Pressure Intake Flows in CI Engine

作　　者：尤国栋[1] 苏铁熊[1] 徐春龙[2] 王增全[2] 

机构地区：[1]中北大学机电工程学院,山西太原030051 [2]中国北方发动机研究所,山西大同037036

出　　处：《中北大学学报（自然科学版）》2012年第4期416-419,共4页Journal of North University of China(Natural Science Edition)

摘　　要：针对柴油机功率密度提高后,进气流动马赫数增大导致严重的流动分离现象,采用k-ε和k-ζ-f湍流涡粘度模型,对U型通道内的气流的运动进行了数值模拟.结果显示k-ζ-f湍流模型能更有效地捕捉到分离流动现象.建立了等效进气门模型,应用三维CFD技术模拟了进气流动速度场,与PIV试验结果对比表明,k-ζ-f模型能更准确地表征进气流动的旋涡和流动分离现象.选择k-ζ-f湍流模型对柴油机直进气道在高压差进气条件下的流量系数进行了模拟,与试验结果吻合良好.With the technical trend of high-power density of diesel engine, the high Mach number intake flow results in the serious flow separation. With k-ε and k-ξ-f turbulent eddy viscosity models, U-shape pipe flow experiment, k-ξ-f model can identify the flow separation more effectively. With the established intake valve model, 3D CFD simulation is applied to simulate the flow of intake valve field. The comparison with PIV experiment results shows that, k-ξ-f model can simulate the intake vortex and flow separation with higher accuracy. With k-ξ-f models, the intake process of diesel direct intake with high-pressure drop is calculated. The intake discharge is in good agreement with the experiment.

关 键 词：柴油机 进气 高压差 湍流模型 数值模拟 

分 类 号：TK421.3[动力工程及工程热物理—动力机械及工程]