M. Varney, M. Passmore, A. Gaylard
{"title":"Parametric Study of Asymmetric Side Tapering in Constant Cross Wind\n Conditions","authors":"M. Varney, M. Passmore, A. Gaylard","doi":"10.4271/06-11-03-0018","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":46295,"journal":{"name":"SAE International Journal of Passenger Cars-Mechanical Systems","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2018-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4271/06-11-03-0018","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"SAE International Journal of Passenger Cars-Mechanical Systems","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4271/06-11-03-0018","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"TRANSPORTATION SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 7
常侧风条件下非对称侧锥的参数研究
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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