| 王龙,李丹勋,王兴奎.高帧频明渠紊流粒子图像测速系统的研制与应用[J].水利学报,2008,39(7): |
| 高帧频明渠紊流粒子图像测速系统的研制与应用 |
| High frame frequency particle image velocimetry for experimental study of open channel turbulent flow |
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| DOI： |
| 中文关键词: PIV系统 明渠紊流 平均流速分布 紊动强度分布 |
| 英文关键词: PIV system open channel turbulent flow verification Reynolds stress distribution of average velocity distribution of turbulent intensiy |
| 基金项目: |
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| 摘要点击次数: 2398 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 0.1h 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. |
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