A new method for evaluating errors in high‐frequency ADV measurements
A new method for evaluating errors in high‐frequency ADV measurements
复制标题
DOI：
10.1002/(sici)1099-1085(20000215)14:2
复制
发表时间：
2000-02
影响因子：
3.2
通讯作者：
S. McLelland;A. Nicholas
中科院分区：
文献类型：
--
作者：
S. McLelland;A. Nicholas
声学多普勒流速仪（ADV）能够在高频下对一个小型的远程采样体中的三维流速进行测量，然而，这些测量包含了测量技术本身所固有的误差。本文展示了一种计算总测量误差的新方法，包括采样误差、多普勒噪声以及与单点ADV测量相关的采样体中由于流速切变所导致的误差。这一过程综合考虑了仪器配置的影响以及任何探头方向下速度分量之间的误差分布。结果表明，ADV能够对高达最大采样率的频率下的湍流速度波动进行表征，并且雷诺切应力误差非常小。版权所有©2000约翰威立父子有限公司
The acoustic Doppler velocimeter (ADV) measures three-dimensional velocities in a small, remote sampling volume at high frequencies, however, these measurements incorporate errors that are intrinsic to the measurement technique. This paper demonstrates a new method for calculating the total measurement errors, including sampling errors, Doppler noise and errors due to velocity shear in the sampling volume associated with single-point ADV measurements. This procedure incorporates both the effects of instrument configuration and the distribution of errors between velocity components for any probe orientation. It is shown that the ADV can characterize turbulent velocity fluctuations at frequencies up to the maximum sampling rate and that Reynolds shear stress errors are very small. Copyright © 2000 John Wiley & Sons, Ltd.