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带侧后缘锥度方型背车辆中尾流动力学检测产品配置单(CCD相机) 【刊物发表】

  • 应用领域: 铁路/船舶/交通
  • 检测样品: 电动车/摩托车
  • 检测项目:尾流动力学
  • 浏览次数:30 次
  • 下载次数:0 次
  • 发布时间:2019-01-16
  • 参考标准:暂无
采用两台LaVision ImagerProX4M相机和两台CMOS相机构成一套可以测量两个互相垂直平面的2D2C和2D3C速度矢量场的粒子成像测速系统。用于带侧后缘锥度方型背车辆低频尾流动力学研究。
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In this paper, the effects of side trailing edge tapering on the wake of a simplified square-back vehicle are investigated. The tapered surfaces are reported to trigger a switch from a laterally asymmetric bi-stable wake to a vertically asymmetric stable wake. The wake structure reported in the literature for lateral symmetry breaking states is seen to rotate by 90? as the angle of the tapered surfaces ?s is increased. A 6% drag reduction over the simple square-back case is reported for 6? < ?s < 12?. This gain is found to be the result of the stretching of the circular vortex responsible for the suction zone visible in any symmetry breaking state. A downwash dominated wake is observed in these conditions. The sensitivity of such a wake to small variations of the model pitch angle (for ?s ? 12?) is also assessed. As the pitch angle α is reduced from 0? to  2?, the time averaged wake is reported to switch from a downwash dominated topology to an upwash dominated topology. A strengthening of the long time instability is observed when the symmetry in the vertical direction is recovered and is accompanied with a 4:9% reduction in base drag over the same model tested at α ? 0?.

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