基于PowerFlow的重型车外气动性能分析及优化

Analysis and Optimization of Heavy-duty Truck External Aerodynamics Performance Based on PowerFlow

在某重型车驾驶室开发过程中,需考虑前扰流板对风阻系数及车门把手位置除尘效果的影响。利用基于LBM方法的CFD软件Power Flow,对该重型车进行外流场计算;基于CFD分析结果,将前扰流板翅片角度下倾15°。改进后的前扰流板设计使整车风阻系数较原来降低3.13%,除尘效果改善显著。改进重型车前扰流板的设计可以有效提升整车外气动性能,该方法为前扰流板气动性能设计提供了理论依据。

The influence of the front spoiler on drag coefficient and dust removal effect near the door handle should be considered in the development of heavy-duty truck cab. The numerical simulation of the external flow field for a heavy-duty truck was taken by CFD software Power Flow which is based on LBM method. According to the results that were obtained with CFD analysis, the fin angle of the front spoiler should be inclined down 15°. The improved design of the spoiler decreased the drag coefficient by 3.13% compared with original vehicle drag coefficient, and dust removal effect has been significantly improved. The improved design of the front spoiler could promote the aerodynamic performance of the heavy-duty truck,providing the theoretical foundation for improving the aerodynamic performance of the front spoiler.