Investigation on subsurface vortices within a closed pump intake under different pressure conditions
Investigation on subsurface vortices within a closed pump intake under different pressure conditions
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不同压力条件下封闭泵入口内的地下涡流研究
DOI：
10.1007/s42241-020-0062-9
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发表时间：
2020-10
影响因子：
2.5
通讯作者：
Shi Xiaoyan
中科院分区：
文献类型：
--
作者：
Guo Miao;Tang Xuelin;Li Xiaoqin;Wang Fujun;Shi Xiaoyan
通过试验研究了不同自由水面压力条件下封闭式水泵进水口内的涡系特征及其演变规律，并分析了同一水位不同平均轴向流速的钟罩对水流流态的影响。对于所有情况，密切观察到三种不同的流动状态：在临界流量下，各种侧壁附着、后壁附着和淹没涡结构及其演化都受到自由表面压力的影响，在较高流量下，随着压力绝对值的增加，这些涡的数量和强度都增加，在较低流量下，侧壁涡的产生与压力大小密切相关，当绝对压力值较低时，侧壁涡不产生，但随着绝对压力值的增加，侧壁涡的数量和强度增加。此外，统计分析表明，在所有工况下，沿流向沿着右侧的侧壁涡发生概率均远高于对侧，尤其是单涡发生概率，而后壁涡发生概率也很高，均在90%以上，多涡发生概率远高于单涡发生概率。捕获的涡被定性地分为不同的“涡区”：无涡区和涡区，包括过渡，单涡和多涡。雷诺数和绝对压力是影响这些涡的存在和数量的最重要的参数，这两个参数的增加减小了无涡过渡区，并导致后壁和侧壁涡区的差异更大。
An experimental study to investigate various features of subsurface vortices and their evolutions inside a closed pump intake under different pressure conditions at free surface, and to analyze the influence of a pipe bell with different mean axial velocities at the same water level on flow patterns is presented. For all cases, three different flow regimes are closely observed: various side-wall attached, back-wall attached and submerged vortices structures, and their evolutions are subject to the free-surface pressure for a critical flow rate, the number and strength of all these vortex rise as the absolute value of the pressure increases for a higher flow rate, for a lower flow rate, whether the side-wall vortices occur or not is related closely to the pressure magnitude, and there are no vortices for lower absolute pressure values, the number and the strength of the side-wall vortices increase as the absolute pressure values increase. Besides, based on statistical analyses, the side-wall vortex probability on the right side along the stream-wise direction is much higher than that on the opposite side for all operation cases, particularly single vortex probability, and the back-wall vortex probabilities are quite higher with values of more than 90%, meanwhile, the multi-vortices probability is much higher than that of the single-vortex. The captured vortices have been qualitatively classified into different “vortex zones”: no vortex zones and vortex zones including transition, single- and multi-vortex. The Reynolds number and the absolute value pressure are the most important parameters which influence the existence and the number of these vortices, and the increase of the two parameters reduces the no vortex transition zone and causes bigger difference in the back-wall and side-wall vortex zones.
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DOI：
10.1177/2041298310393447
发表时间：
2011-06
期刊：
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
影响因子：
--
作者：
X. Tang;Fujun Wang;Y. Li;G. Cong;X. Shi;Y. Wu;L. Qi
通讯作者：
X. Tang;Fujun Wang;Y. Li;G. Cong;X. Shi;Y. Wu;L. Qi
影响因子：
1.2
作者：
N. Kimura;T. Ezure;A. Tobita;H. Kamide
通讯作者：
N. Kimura;T. Ezure;A. Tobita;H. Kamide
DOI：
10.1016/j.egypro.2015.11.836
发表时间：
2015-12
期刊：
Energy Procedia
影响因子：
--
作者：
L. Cristofano;M. Nobili
通讯作者：
L. Cristofano;M. Nobili
影响因子：
2.4
作者：
M. Padmanabhan;G. Hecker
通讯作者：
M. Padmanabhan;G. Hecker
DOI：
10.1061/(asce)ps.1949-1204.0000074
发表时间：
2011-05
影响因子：
2
作者：
Z. Ahmad;B. Jain;S. Kumar;M. K. Mittal
通讯作者：
Z. Ahmad;B. Jain;S. Kumar;M. K. Mittal