Investigation on free-surface vortices within a closed pump intake under different pressure conditions using stereo PIV
Investigation on free-surface vortices within a closed pump intake under different pressure conditions using stereo PIV
复制标题
使用立体 PIV 研究不同压力条件下封闭泵入口内的自由表面涡流
DOI：
10.1080/00223131.2020.1819906
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发表时间：
2021
影响因子：
1.2
通讯作者：
Shi Xiaoyan
中科院分区：
文献类型：
--
作者：
Guo Miao;Tang Xuelin;Wang Fujun;Li Xiaoqin;Shi Xiaoyan
本文研究了五种压力条件下封闭式水泵进水口内的自由表面涡和涡量分布随时间的变化。系统地分析了这些涡旋的位置、强度、出现概率和透视统计以及涡旋的概率分布。在亚临界（Q= 19.78m3/h）时，涡的产生与压力大小密切相关; (b)临界（Q= 22.61 m3/h），旋涡的演变受到所施加压力的显著影响。涡的数量随着绝对压力值的增加而增加，具有波动性和随机性。(c)超临界（Q= 25.43 m3/h），当达到压力条件的最高绝对值时，整个测量段的空间尺度被涡流占据。通过统计分析，得到了测量截面内出现旋涡的概率。被捕获的旋涡被定性地划分为不同的“旋涡区”。Re、We和绝对压力是影响自由表面涡的存在和数量的最重要的参数。试验结果可为闭式取水口的实际运行提供参考，为闭式取水装置的设计提供指导。
ABSTRACT This paper examines free-surface vortices and the vorticity distribution with time-dependent evolution within a closed pump intake under five pressure conditions. The location and the strength of these vortices, occurrence probability and perspective statistics, as well as vortex probability distribution are all systematically analyzed. Three cases were observed and analyzed: (a) Subcritical (Q= 19.78 m3/h), whether vortices occur or not is related closely to the pressure magnitude. (b) Critical (Q= 22.61 m3/h), evolution of vortices was significantly impacted by the pressure applied. The number of vortices increases as the absolute pressure values increase, which was fluctuating and random. (c) Supercritical (Q= 25.43 m3/h), the spatial scale of the whole measurement section is occupied by the vortex when the highest absolute values of pressure conditions are reached. Based on statistical analyses, the probability of vortex occurrence within the measurement section was obtained. The captured vortices have been qualitatively classified into different ‘vortex zones’. The Re, We and the absolute value pressures are the most important parameters influencing the existence and the number of free-surface vortices. The experiment results may provide a reference for the actual operation of closed pump intake and the design guidelines for the installations with closed pump intakes.