使用雷诺平均法由PIV数据确定可压缩流体中的平均压力

2019/08/04   下载量： 0 次

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由5台LaVision ImagerLX 2MP型相机构成3D3C体视层析PIV测量系统。利用DaVis8.1软件平台进行数据采集控制和分析处理。并利用PIV结果求得可压缩流体的平均压力。

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    The feasibility of computing the flow pressure on the basis of PIV velocity data has been demonstrated abundantly for lowspeed conditions. The added complications occurring for high-speed compressible flows have, however, so far proved to be largely inhibitive for the accurate experimental determination of instantaneous pressure. Obtaining mean pressure may remain a worthwhile and realistic goal to pursue. In a previous study, a Reynolds-averaging procedure was developed for this, under the moderate-Mach-number assumption that density fluctuations can be neglected. The present communication addresses the accuracy of this assumption, and the consistency of its implementation, by evaluating of the relevance of the different contributions resulting from the Reynolds-averaging. The methodology involves a theoretical order-of-magnitude analysis, complemented with a quantitative assessment based on a simulated and a real PIV experiment. The assessments
show that it is sufficient to account for spatial variations in the mean velocity and the Reynolds-stresses and that temporal and spatial density variations (fluctuations and gradients) are of secondary importance and comparable order-of-magnitude. This result permits to simplify the calculation of mean pressure from PIV velocity data and to validate the approximation of neglecting temporal and spatial density variations without having access to reference pressure data.

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北京欧兰科技发展有限公司
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