多时距PIV技术在复杂流场测量中的应用

采用一种多时间间距适配(多时距)的粒子图像测速(PIV)技术对静水与横流环境下的垂向圆管射流流场进行测量,对比分析了多时距PIV技术测量结果的可靠性,探究了静水与横流环境下垂向圆管射流的运动特性。结果表明,多时距PIV技术得到的测量结果能够精确反映射流在静水和横流环境中的时均特征和紊动特征,且其精度明显优于传统PIV技术所得到的测量结果。研究发现,多时距PIV技术可既方便又精准地测量视窗内速度变化大的流场。

Application of multi time-interval PIV technique in complex flow field measuremen

A particle image velocimetry (PIV) technique with the adaptation of multi time-interval was used to measure the flow field of vertical round jet in still water and cross-flow environments. The reliability of measurement results of the multi time-interval PIV technique was compared and analyzed, and the motion characteristics of the vertical round jet were studied. The results show that the measurement results obtained by the multi time-interval PIV technique can accurately reflect the time-averaged and turbulent characteristics of the jet in still water and cross-flow environments, and its accuracy is significantly better than that of the traditional PIV technique. This study found that the multi time-interval PIV technique can conveniently and accurately measure the flow field with large velocity variation in the viewing window.