低比转数潜水排污泵的内部流场PIV试验研究

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针对低比转数潜水排污泵的研究现状进行调研后发现,目前主要的研究手段以数值计算为主,缺乏对其内部流场的可视化试验研究,因此,为揭示低比转数潜水排污泵内部流场的物理结构及流场演化过程,针对一比转数ns=60的潜水排污泵进行结构改造后,以透明的有机玻璃材料代替传统的金属材料,以空心玻璃球作为示踪粒子,进行了不同工况下的二维PIV测试.试验结果表明：在科氏力的作用下,叶片进口吸力面上的相对速度大于压力面上的,而叶片出口则相反;在大流量工况下叶片进口边的速度梯度最大,叶片出口的＂射流-尾迹＂现象也最为明显;在不同流量工况下,叶片压力面一侧均存在一定脱流现象,该脱流区域随流量的减小向叶片出口方向移动,并逐渐形成一个与叶片旋转方向相反的旋涡;当流量为0.2Qd时,该旋涡位于叶片流道出口中心,并堵塞了大部分流道.

After the state-of-the-art investigations into low specific speed submersible sewage pumps were reviewed,it was found that the studies mainly focused on numerical calculations,while there is a lack of internal flow field visualization investigations.Therefore,the internal flow field in a submersible sewage pump with specific speed of 60 was measured by means of a 2D-PIV under different operating conditions to reveal the flow structure and development in the impeller from the inlet to the outlet.The pump original structure was modified with a transparent plexiglas to replace the conventional metal material,and the hollow glass spheres were severed as seeding particles for the PIV measurements.The experimental results show that the relative velocity on the blade suction surface near the blade inlet is greater than that on the blade pressure surface while this velocity profile is reverse near the blade outlet due to the Coriolis effect.The velocity gradient at the blade inlet is the largest,and the jet-wake phenomenon at the blade outlet is the most obvious at high flow rates.A flow separation was observed on the blade pressure surface at various flow rates;meanwhile,it moved towards the blade outlet and gradually developed into a vortex rotating in the direction of opposite blade rotation with decreasing flow rate.At 0.2Qd operating point,the vortex is in the center of flow passage at the blade outlet and blocks most of the passage.

潜水排污泵，低比转数，PIV，射流-尾迹，脱流，submersible sewage pump，low specific speed，particle image velocimetry，jet-wake，flow separation。

低比转数潜水排污泵的内部流场PIV试验研究。