PIV不确定度的传播

2017/02/10   下载量： 7 次

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应用领域 其他
检测样本 其他
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LaVision公司的首席执行官Bernhard Wieneke是PIV领域的著名学者。在PIV不确定度的定量分析领域发表过多篇高水平，开拓性的文章。这是其中一篇。

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This paper discusses the propagation of the instantaneous uncertainty of PIV measurements
to statistical and instantaneous quantities of interest derived from the velocity field. The
expression of the uncertainty of vorticity, velocity divergence, mean value and Reynolds
stresses is derived. It is shown that the uncertainty of vorticity and velocity divergence requires
the knowledge of the spatial correlation between the error of the x and y particle image
displacement, which depends upon the measurement spatial resolution. The uncertainty of
statistical quantities is often dominated by the random uncertainty due to the finite sample
size and decreases with the square root of the effective number of independent samples.
Monte Carlo simulations are conducted to assess the accuracy of the uncertainty propagation
formulae. Furthermore, three experimental assessments are carried out. In the first experiment,
a turntable is used to simulate a rigid rotation flow field. The estimated uncertainty of the
vorticity is compared with the actual vorticity error root-mean-square, with differences
between the two quantities within 5–10% for different interrogation window sizes and
overlap factors. A turbulent jet flow is investigated in the second experimental assessment.
The reference velocity, which is used to compute the reference value of the instantaneous
flow properties of interest, is obtained with an auxiliary PIV system, which features a
higher dynamic range than the measurement system. Finally, the uncertainty quantification
of statistical quantities is assessed via PIV measurements in a cavity flow. The comparison
between estimated uncertainty and actual error demonstrates the accuracy of the proposed
uncertainty propagation methodology.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 采用时间分辨层析PIV以欧拉和拉格朗日视角研究湍流边界层（TBL）

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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