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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Mechanical and Electrical Engineering     
Experimental analysis on characteristic of cavitation in tip region of axial flow pump impeller
ZHANG De sheng, SHI Lei, CHEN Jian, PAN Qiang, SHI Wei dong
Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
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Abstract  

The high speed photography technology was used to analyze the cavitation feature in the tip region of an axial-flow pump model, in terms of hydraulic and cavitation performance of the pump model with different blade numbers, the trajectories of tip leakage vortex for various flow rates, cavitation patterns under changeable cavitation conditions and transient characteristic of tip vortex cavitation. The experimental results show that hydraulic and cavitation performance of the model pump can be improved by the appropriate increase of blade number. When the pump operates under small flow rate condition, it is more prone to generating cavitation. With the increase of flow rate, the angle between the blade suction side and tip-leavage vortex decreases, and its origin is delayed further downstream. Cloud cavitation vortices, at the trailing edge of triangle cloud cavitation, is entrained by tip-leakage vortex. Then it interacts with the shedding cavitation vortices at the aft part of vortex rope and moves towards the pressure side of neighboring blade in the direction that nearly perpendicular to the blade suction side, resulting in the blockage of flow passage and severe degradation of the performance. As a consequence of the blockage, the leakage flows in the tip clearance would decrease, bringing about the decrease of tip clearance cavitation and the width of triangle cloud cavitation connecting with the blade suction side．

Published: 01 August 2016
CLC:  TH 311  
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ZHANG De sheng, SHI Lei, CHEN Jian, PAN Qiang, SHI Wei dong. Experimental analysis on characteristic of cavitation in tip region of axial flow pump impeller. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(8): 1585-1592.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.08.022     OR     http://www.zjujournals.com/eng/Y2016/V50/I8/1585


轴流泵叶轮叶顶区空化特性试验分析

为了研究叶顶区空化特性,以某一模型轴流泵为研究对象,利用高速摄影试验,探讨不同叶片数下泵的水力性能和空化性能、不同流量下的叶顶泄漏涡轨迹、不同空化数下的叶顶空化形态以及叶顶区空化发展瞬态特性.试验结果表明,适当增加叶片数,泵的水力性能和空化性会更好|在小流量工况下,叶顶更易发生空化初生|随着流量的增大,叶顶泄漏涡轨迹与叶片吸力面的夹角逐渐减小,同时泄漏涡初生点逐渐向叶顶尾缘移动；在叶顶三角形云状空化尾缘产生云状空化涡,受到叶顶泄漏涡的卷吸,与叶顶泄漏涡涡带尾缘脱落的空化涡相互作用混合,沿着几乎垂直叶片的方向向相邻叶片的压力面移动,造成了流道的堵塞,降低了泵的水力性能.垂直云状空化涡堵塞流道,引起叶顶区流量减小,造成叶顶间隙空化减少以及与叶顶区相连的三角形云状空化的宽度减小.

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