This paper proposes a new method that obstacles are attached to both the suction and pressure surfaces of the blades to suppress cavitation development. A centrifugal pump with a specific speed of 32 is selected as the physical model to perform the external characteristic and cavitation performance experiments. SST k − ω turbulence model and Zwart cavitation model were employed to simulate the unsteady cavitation flow in the pump. The results indicate that the numerical simulation results are in good agreement with the experimental counterparts. After the obstacles are arranged, the maximum head decrease is only 1.37%, and the relative maximum drop of efficiency is 1.12%. Obstacles have minimal impacts on the variations of head and efficiency under all flow rate conditions. The distribution of vapor volume in the centrifugal pump is significantly reduced after obstacles are arranged and the maximum fraction reduction is 53.6%. The amplitude of blade passing frequency decreases significantly. While obstacles decrease the intensity of turbulent kinetic energy near the wall in the impeller passages to effectively reduce the distribution of cavitation bubbles, and control the development of cavitation. After the obstacles are set, the strength of the vortex in the impeller passages is weakened significantly, the shedding of the vortex is suppressed, flow in the impeller becomes more stable.

中文翻译：

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离心泵叶片表面障碍物抑制汽蚀发展的影响研究

本文提出了一种新的方法，即在叶片的吸力面和压力面都安装障碍物来抑制气蚀的发展。选择比转速为32的离心泵作为物理模型，进行外特性和汽蚀性能实验。SSTķ - ω采用湍流模型和 Zwart 空化模型来模拟泵内的非定常空化流动。结果表明，数值模拟结果与实验结果吻合良好。设置障碍物后，最大水头下降仅为1.37%，效率相对最大下降1.12%。在所有流速条件下，障碍物对扬程和效率变化的影响最小。设置障碍物后，离心泵内蒸汽体积分布明显减少，最大减少分数为53.6%。叶片通过频率幅度显着降低。而障碍物降低了叶轮通道中壁面附近的湍动能强度，有效减少了空化气泡的分布，并控制气蚀的发展。设置障碍物后，叶轮通道内的涡流强度明显减弱，涡流的脱落得到抑制，叶轮内的流动更加稳定。