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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >The vortex structure behind an Ahmed reference model in the presence of a moving ground plane
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The vortex structure behind an Ahmed reference model in the presence of a moving ground plane

机译：存在移动地平面时Ahmed参考模型背后的涡旋结构

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摘要

Laser Doppler anemometry (LDA) data are presented for an Ahmed reference model employing various backlight angles. LDA velocity measurements are taken in a number of planes around and downstream of the model at a free-stream velocity of 25 m s(-1). During the testing a rolling road provided ground simulation and six-component force data were recorded. Data from these experiments are compared to previous experimental data. It is found that the inclusion of the ground simulation and the consequent supporting strut produces a reduction in the size and strength of the vortices shed from the back end of the Ahmed model when compared with previous analysis. It is further concluded this effect is primarily a result of the overhead strut, and that the rolling road has little effect on these upper vortices. In addition, vortices shed from the underside of the model, not reported in previous experimental work, are found and analysed.
机译：针对采用各种背光角度的Ahmed参考模型，提供了激光多普勒风速仪（LDA）数据。 LDA速度测量是在模型周围和下游的许多平面中以25 m s（-1）的自由流速度进行的。在测试过程中，一条滚动道路提供了地面模拟，并记录了六分量力数据。将来自这些实验的数据与先前的实验数据进行比较。发现与以前的分析相比，包含地面模拟和随之而来的支撑杆可减少从艾哈迈德模型后端散发出的涡流的大小和强度。可以进一步得出结论，这种影响主要是由于高架撑杆的结果，而滚动道路对这些上部涡流的影响很小。此外，发现并分析了从模型下面散发的涡流，这些涡流在先前的实验工作中未进行报告。

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