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首页> 外文会议>Vehicle aerodynamics, 2012. >CFD Analysis of Various Automotive Bodies in Linear Static Pressure Gradients
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CFD Analysis of Various Automotive Bodies in Linear Static Pressure Gradients

机译：线性静压梯度下各种汽车车身的CFD分析

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摘要

Establishing data adjustments that will give an interference free result for bluff bodies in automotive wind tunnels has been pursued for at least the last 45 years. Recently, the Two-Measurement correction method that yields a wake distortion adjustment for open jet wind tunnels has shown promise of being able to adjust for many of the effects of non-ideal static pressure gradients on bluff automotive bodies. Utilization of this adjustment has shown that a consistent drag results when the vehicle is subjected to the various gradients generated in open jet wind tunnels. What has been lacking is whether this consistent result is independent of the other tunnel interference effects. The studies presented here are intended to fill that gap on the performance of the two-measurement technique. The subject CFD studies are designed to eliminate all wind tunnel interference effects except for the variation of the (linear) static pressure gradient. Zero gradients and linear gradients are generated by tapering the walls of solid wall test sections with a blockage ratio of 0.5%. Under these conditions, the variation in drag coefficient is observed with and without application of simple buoyancy adjustments, Glauert Factor based adjustments, and the two-measurement method adjustments. Conclusions are reached relative to the ability with each of these approaches to achieve interference free results on a range of vehicle body styles both simplified and with a moderate level of production vehicle detail.
机译：至少在过去的45年中，一直在建立数据调整，以使汽车风洞中的钝体得到无干扰的结果。近来，“二次测量”校正方法为敞开式喷射风洞产生了尾流畸变调整，已显示出能够针对非理想静压力梯度对钝性车身的许多影响进行调整的希望。利用这种调节已经显示出，当车辆经受在敞开式喷射风洞中产生的各种梯度时，会产生一致的阻力。一直缺乏的是这种一致的结果是否独立于其他隧道干扰影响。此处提出的研究旨在填补两次测量技术性能上的空白。该CFD研究旨在消除（线性）静压力梯度变化之外的所有风洞干扰影响。零梯度和线性梯度是通过以0.5％的堵塞率使实心壁试验截面的壁逐渐变细而产生的。在这些条件下，在有或没有应用简单浮力调整，基于Glauert因子的调整以及两次测量方法调整的情况下，均可观察到阻力系数的变化。得出的结论是，相对于上述每种方法在一系列简化的车身样式和中等程度的生产细节上实现无干扰结果的能力。

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