导流罩对轻型厢式货车气动特性影响的数值模拟

针对某国产轻型厢式货车的简化模型,应用计算流体力学原理与方法,采用全六面体单元的结构化网格和RNGk-ε模型对其加装导流罩前后的外流场进行了数值模拟,得到了两种情况下该车的表面压力、速度矢量分布以及气动阻力系数等气动特性。对比分析结果表明,加装导流罩可以明显地改善轻型厢式货车的气动特性,降低气动阻力,与试验结果一致。

Numerical simulation of influence of guide cowl on light-duty van aerodynamic characteristics

The theory and the method of the computational fluid dynamics were applied to the numerical simulation of the external flow field around the simplified model of a certain domestic light-duty van with and without the guide cowl on its cab roof.The RNG k-ε turbulence model as well as the structural grid of hexahedral cells were used in the simulation.The aerodynamic characteristics for the two cases were calculated including the pressure distribution on the van surface,the velocity vector distribution and the aerodynamic drag coefficients.The comparative analysis results show that introduction of the guide cowl improves obviously the aerodynamic characteristics of the van,which are in good agreement with the experimental results.