常侧风条件下非对称侧锥的参数研究

IF 1.3 Q3 TRANSPORTATION SCIENCE & TECHNOLOGY SAE International Journal of Passenger Cars-Mechanical Systems Pub Date : 2018-06-28 DOI:10.4271/06-11-03-0018
M. Varney, M. Passmore, A. Gaylard
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引用次数: 7

摘要

版权所有©2018 SAE International。运动型多用途车(SUV)通常具有钝的后端几何形状,用于设计和实用性,这通常不是空气动力学。可以通过多种被动和主动方法来减少阻力,这些方法通常在零偏航时优先考虑,这并不完全代表“道路”环境。因此,为了将视觉上正方形的几何形状(静止时)与非零偏航时的最佳减阻相结合,对独立应用垂直侧边锥度的自适应系统进行静态测试。拉夫堡大学的大型风洞采用¼比例的温莎模型进行了参数研究。在力和力矩系数的偏航角范围(0°、±2.5°、±5°和±10°)内,评估了实施不对称侧锥的空气动力学效应。该自适应系统降低了测试的每个非零偏航角下的阻力,从最简单的几何形状(无车轮的全身锥度)到最复杂的几何形状(有车轮的上身锥度),成功率各不相同;从而提供从3%到125%的额外阻力减小。该系统还显示出有益地修改几何形状的侧风稳定性的潜力。
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Parametric Study of Asymmetric Side Tapering in Constant Cross Wind Conditions
Copyright © 2018 SAE International. Sports Utility Vehicles (SUVs) often have blunt rear end geometries for design and practicality, which is not typically aerodynamic. Drag can be reduced with a number of passive and active methods, which are generally prioritised at zero yaw, which is not entirely representative of the “on road” environment. As such, to combine a visually square geometry (at rest) with optimal drag reductions at non-zero yaw, an adaptive system that applies vertical side edge tapers independently is tested statically. A parametric study has been undertaken in Loughborough University’s Large Wind Tunnel with the ¼ scale Windsor Model. The aerodynamic effect of implementing asymmetric side tapering has been assessed for a range of yaw angles (0°, ±2.5°, ±5° and ±10°) on the force and moment coefficients. This adaptive system reduced drag at every non-zero yaw angle tested, from the simplest geometry (full body taper without wheels) to the most complex geometry (upper body taper with wheels) with varying levels of success; providing additional drag reductions from 3% to 125%. The system also shows potential to beneficially modify the cross wind stability of the geometry.
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