A PIV algorithm for estimating time-averaged velocity fields
A PIV algorithm for estimating time-averaged velocity fields
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DOI：
10.1115/1.483256
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发表时间：
2000-06-01
影响因子：
2
通讯作者：
Santiago, JG
中科院分区：
文献类型：
--
作者：
Meinhart, CD;Wereley, ST;Santiago, JG
本文提出了一种用于估计时间平均或相位平均速度场的PIV算法。该算法可应用于信号强度不足以用于标准互相关技术的情况，例如询问点中的粒子图像数量少或图像质量差。该算法还可用于通过允许比标准互相关技术所需的询问点更小的询问点来增加测量的空间分辨率。与通常使用的先估计瞬时速度场然后平均速度场的技术相反，通过在确定信号峰值的位置之前平均一系列瞬时相关函数，可以显著地提高速度测量的质量。该算法被应用到一个30亩mx300妈妈微通道流。【S0098-2202（00）00602-7】。
A PIV algorithm is presented for estimating time-averaged or phase-averaged velocity fields. The algorithm can be applied to situations where signal strength is not sufficient for standard cross correlation techniques, such as a low number of particle images in an interrogation spot, or poor image quality The algorithm can also be used to increase the spatial resolution of measurements by allowing smaller interrogation spots than those required for standard cross correlation techniques. The quality of the velocity measurements can be dramatically increased by averaging a series of instantaneous correlation functions before determining the location of the signal peak, as opposed to the commonly used technique of estimating instantaneous velocity fields first and then averaging the velocity fields. The algorithm is applied to a 30 mu mx300 mum microchannel flow. [S0098-2202(00)00602-7].