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首页> 外文会议>Vehicle aerodynamics, 2012. >Unsteady Vehicle Aerodynamics during a Dynamic Steering Action: 2nd Report, Numerical Analysis
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Unsteady Vehicle Aerodynamics during a Dynamic Steering Action: 2nd Report, Numerical Analysis

机译：动态转向过程中的非定常车辆空气动力学：第二次报告，数值分析

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摘要

Unsteady aerodynamic forces acting on vehicles during a dynamic steering action were investigated by numerical simulation, with a special focus on the vehicles' yaw and lateral motions. Two sedan-type vehicles with slightly different geometries at the front pillar, side skirt, under cover, and around the front wheel were adopted for comparison. In the first report, surface pressure on the body and total pressure behind the front wheel were measured in an on-road experiment. Then the relationships between the vehicles' lateral dynamic motion and unsteady aerodynamic characteristics during cornering motions were discussed. In this second report, the vehicles' meandering motions observed in on-road measurements were modeled numerically, and sinusoidal motions of lateral, yaw, and slip angles were imposed. The responding yaw moment was phase averaged, and its phase shift against the imposed slip angle was measured to assess the aerodynamic damping. It was found that the vehicle model with a higher sensory rating of high speed stability in the on-road test showed higher aerodynamic damping for the slip-angle change. The difference in flow structures on the sides of the vehicles and their contributions to the yaw and lateral motions were also investigated by visualizing the transient numerical results. Observations revealed that the vehicle with higher stability had thinner side flow structures, and flows around the front wheel house and rear-end corner contributed to restraining the rotating motion during the meandering motion. As a result, the discussions and analogy included in the previous report based on the restricted on-road measurements were confirmed in the present numerical analysis.
机译：通过数值模拟研究了在动态转向动作过程中作用在车辆上的非稳态空气动力，尤其侧重于车辆的偏航和侧向运动。为了比较，采用了两辆轿车型车辆，它们在前柱，侧裙，底盖和前轮周围的几何形状略有不同。在第一个报告中，在道路实验中测量了车身表面压力和前轮后面的总压​​力。然后讨论了车辆侧向动态运动与转弯运动中非定常空气动力学特性之间的关系。在第二份报告中，对在道路测量中观察到的车辆的曲折运动进行了数值模拟，并施加了横向，偏航和滑移角的正弦运动。对响应的偏航力矩进行相位平均，并测量其相对于施加的滑移角的相移，以评估空气动力学阻尼。发现在公路测试中具有较高的高速稳定性感官评价的车辆模型对于滑移角变化显示较高的空气动力学阻尼。通过可视化瞬态数值结果，还研究了车辆侧面流动结构的差异及其对偏航和横向运动的影响。观察发现，具有较高稳定性的车辆具有较窄的侧向流动结构，并且在前轮罩和后端拐角周围的流动有助于抑制曲折运动期间的旋转运动。结果，在本次数值分析中证实了基于有限的道路测量结果的先前报告中的讨论和类比。

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