基于大尺度PIV的涌浪首浪翻坝过程下坡面流速分布测量

The Surface Velocity Distribution Measurement Based On LS-PIV Technology On in the Downstream Slop Face Of a Dam

涌浪翻坝过程对坝体下坡面的侵蚀程度与涌浪的速度密切相关,由于测量手段的匮乏,很难得到准确全面的表面流速分布情况。针对于此,通过对MPIV开源程序二次开发,引入大尺度PIV(LS-PIV)技术,对涌浪首浪翻坝过程坝体下坡面速度分布进行测量。经过对图像和数据进行分析,得到以下结论:(1)LS-PIV技术在涌浪翻坝过程表面流速测量中的应用是可行且可靠的;(2)涌浪作用阶段,坝体下坡面的表面流速分布具有不均匀性;(3)涌浪作用过程,峰头在下坡面移动速度是一个先急剧增大再缓慢增大到一个峰值再急剧下降的过程。研究可为其他试验设计和理论研究提供参考和借鉴。

The degree of erosion on downstream slop of a dam during the process of the surge passing a dam is closely related to the speed of the surge during the process of the surge passing a dam, however, it＇s hard to obtain the overall and accuracy water surface velocity distribution is due to the lack of measurements. Thus, this paper introduced LS - PIV（ The large scale Particle Image Velocimetry） technology is introduced to measure the water surface velocity of the dam downstream slop, Based on analysis of the images and data, this paper got the following conclusionit is concluded： （1）The large scale PIV technology is feasible and reliable when apply in the measurement of the surge passing a dam; （2）The water surface velocity distribution is not unifornfity during the surge passing the down- stream of a dam; （3）The velocity of water front on downstream was first sharp increased and slowly increase to a peak value and sharp decreased process during the surge pass the downstream slop. In this paper, the research can be used as test design of other researchers and provide theoretical reference.