Abstract: In order to identify the influence of the A pillar-angle to the drag coefficient on truck, the deformation technology is used to fit the change of A pillar-angle, and the drag coefficient of small truck and small light truck under different A pillar-angles is simulated by computational fluid dynamics (CFD) method. The results show that in the range of 22～38°, the greater of the A pillar- angle, the smaller of the drag coefficient on small truck, and the value of drag coefficient almost decreases by 8cts for every degree increase. In the range of 13～22°, the greater of the A pillar angle, the greater of the drag coefficient on small light truck, and the drag coefficient almost increases by 3cts for every degree increase. This paper comes to a conclusion to the relationship of A pillar-angle and drag coefficient on truck, providing design guidelines for truck platform development.

Key words: Light truck; A pillar-angle; Aerodynamics; Drag coefficient

摘要： 为了识别驾驶室 A 柱倾角对货车风阻系数的影响，采用变形技术模拟出货车驾驶室 A 柱倾角变化，并用计算流体动力学（CFD）方法计算出了不同 A 柱倾角下的小卡及小轻卡风 阻系数。研究结果表明，在 22～38°范围内，A 柱倾角越大，小卡车型的风阻系数越小，每 度约降低风阻系数 8 cts；在 13～22°范围内，A 柱倾角越大，小轻卡车型风阻系数越大，每 度约增加风阻系数 3 cts。文章针对轻型货车总结出，A 柱倾角和风阻系数的关系，为轻型货 车的平台化设计提供了设计依据。

关键词: 轻型货车；A 柱倾角；空气动力学；风阻系数