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首页> 外文会议>Vehicle aerodynamics, 2012. >Bluff Body Drag Reduction with Ventilated Base Cavities
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Bluff Body Drag Reduction with Ventilated Base Cavities

机译：通风腔可减少虚张声势

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摘要

Various techniques to reduce the aerodynamic drag of bluff bodies through the mechanism of base pressure recovery have been investigated. These include, for example, boat-tailing, base cavities and base bleed. In this study an Ahmed body in squareback configuration is modified to include a base cavity of variable depth, which can be ventilated by slots. The investigation is conducted in freestream and in ground proximity. It is shown that, with a plain cavity, the overall body drag is reduced for a wide range of cavity depths, but a distinct minimum drag condition is obtained. On adding ventilation slots a comparable drag reduction is achieved but at a greatly reduced cavity depth. Pressure data in the cavity is used to determine the base drag component and shows that the device drag component is significant. Modifications of the slot geometry to reduce this drag component and the effects of slot distribution are investigated. Some flow visualisation using PIV for different cavity configurations is also presented.
机译：已经研究了通过基本压力恢复机制来减少钝体的气动阻力的各种技术。这些包括，例如，船尾，底腔和底流。在这项研究中，对方型配置的Ahmed身体进行了修改，使其包括一个深度可变的基础腔，该腔可以通过狭槽通风。调查是在自由流和地面附近进行的。结果表明，在一个普通的空腔中，整个空腔深度范围内的整体阻力都减小了，但获得了明显的最小阻力条件。通过增加通风槽，可达到类似的减阻效果，但是腔深度大大减小。腔中的压力数据用于确定基础阻力分量，并显示设备阻力分量很重要。研究了插槽几何形状的修改以减少此阻力分量以及插槽分布的影响。还介绍了一些使用PIV进行不同腔体配置的流动可视化。

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