不同工作原理的PIV在紊流测量中的适应性分析  

Adaptability of PIV based on different working principle to turbulence measurements

作　　者：胡江[1,2] 王兴奎[1] 杨胜发[2] 兰艳萍[2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074

出　　处：《水力发电学报》2013年第1期181-186,共6页Journal of Hydroelectric Engineering

基　　金：国家科技支撑计划项目(2011BAB09B01)"三峡水库常年回水区航运工程建设关键技术研究";重庆市自然科学基金(cstc2011jjA1167)

摘　　要：基于单脉冲和双脉冲两种PIV系统的不同工作原理和高精度水槽试验数据分析了其在紊流测量中的适应性、数据的统计分析方法以及对样本容量的要求。双脉冲PIV系统和频率高于100Hz的单脉冲PIV系统均适合于紊流的测量,频率低于50Hz的单脉冲PIV系统只适合于平均流速的测量。传统的三种紊流数据统计分析方法中,双脉冲PIV只适合于统计平均法,高频单脉冲PIV可采用时间平均和统计平均两种方法。在进行平均流速的测量时,两种PIV系统的样本容量在500以上即能满足要求。在进行均匀紊流紊动特性的研究时,单脉冲PIV样本容量在30000时已经足够;而双脉冲PIV采用3000个采样数据不能保证所获得成果均满足要求,需要3000个以上的样本才能获得较好的结果。Adaptability of monopulse PIV and double-pulse PIV to turbulent flow measurements are analyzed in this paper, using experimental data of flows in a chute and considering the difference in PIV working principles, statistical methods of data processing, and their requirements for data sample size. Both double- pulse PIV and high-frequency monopulse PIV （higher than 100Hz） are fit for turbulence measurement. If its frequency is lower than 50Hz, monopulse PIV is fit for time-average velocity only. Among the three traditional methods for data processing, time-average method and statistical average method can be used for monopulse PIV data, while only the latter method can be used for double-pulse PIV data. In measurement of time-average velocity, both PIV systems perform well if sample size is over 500, while in measurement of turbulence characteristics, the size must be increased to at least 3,000 and 5,000 for monopulse PIV and double-pulse PIV, respectively.

关 键 词：水力学 单脉冲PIV 双脉冲PIV 紊流测量 数据统计分析方法 采样容量 

分 类 号：TV145.1[水利工程—水力学及河流动力学]