两相流水沙分离鳃流场的PIV测试及分析

Test and Analysis on Flow Field in A Two-Phase Flow Water-Sediment Separation Device by PIV Techniques

利用粒子图像测速技术,测试了两种工况下垂向异重流式水沙分离鳃中水沙两相流的速度场,给出了分离鳃内泥沙运动的流速矢量分布图、流速云图及三维流场分布图。对测试结果的分析表明,分离鳃内部形成了泥沙沿鳃片上表面向下运动,清水沿鳃片下表面向上运动的垂向异重流现象,加速了泥沙的下沉。此分析结果与实际观察现象及理论分析一致,进一步探明了分离鳃的水沙分离机理。

A Particle Image Velocimetry （short for PIV） technology was used to test the velocity field of water-sediment two-phase flow in a vertical-component density flow water-sediment separation device un- der two working conditions, and the distribution map of velocity vector of sediment movement in separation device,cloud atlas of velocity and distribution map of three-dimentional flow field were presented. Analysis of the test results indicated that a vertical-component density flow was formed in the separation device,and its phenomena was follows as：the sediment moved down along the upper surface of the gill slice and the water moved up along the undersurface oppositely. This analysis result was in accordance with the real ob- served phenomena and the theoretical analysis result, which further proved the separation mechanism of water and sediment in the separation device.