摘要
研制了一套明渠紊流二维水槽试验系统,并开发了图像采集和数据处理软件,该系统测量频率高,局部图像最高频帧可达800Hz。应用于试验水槽水流的测量结果得出雷诺应力在距床面0.1h(水深)以上沿深度呈线性分布,纵向时均流速垂线分布在y+=30以上基本符合对数律,纵向紊动强度在y+=50以上基本符合指数分布,与现有的研究成果吻合,证实了系统的可靠性。
A particle image velocimetry（PIV） measurement system with high frame frequency is developed for experimental study of turbulent open channel flow. The corresponding software for image collection and data processing are also developed. The highest frame frequency reaches 800Hz for local image, so that the high frequency fluctuation of flow velocity can be measured. The measurement result of open channel flow shows that the Reynolds stress along the water depth higher than 0.1 h exhibits linear law, the distribution of time average longitudinal flow velocity along the depth in the range of y ＋ 〉 30 obeys the logarithm law and the longitudinal turbulent intensity obeys the exponential law. This result accords with the well known existing study result, and the reliability of the system is verified.
出处
《水利学报》
EI
CSCD
北大核心
2008年第7期781-787,共7页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(50579032
50221903)
关键词
PIV系统
明渠紊流
平均流速分布
紊动强度分布
PIV system
open channel turbulent flow
verification
Reynolds stress
distribution ofaverage velocity
distribution of turbulent intensiy
