Stereo PIV measurement of vortices in a model pump intake
Stereo PIV measurement of vortices in a model pump intake
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DOI：
10.1088/1755-1315/240/7/072020
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
Miao Guo;Xuelin Tang;Xiaoqin Li;Fujun Wang
中科院分区：
文献类型：
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作者：
Miao Guo;Xuelin Tang;Xiaoqin Li;Fujun Wang
为了加深对水泵进水口内各种旋涡的认识，采用体视PIV（ParticleImageVelocimetry）技术，在恒定流量和不同水位条件下，对水平六面体进水口内带喇叭口的垂直进水管模型水泵进水口内的旋涡流动进行了研究。两种不同的流态被观察到的两种情况下：一个“临界水位（CWL）”的临界流量（情况1），一个“更高的水位”的一致的流量与前一个（情况2），和速度矢量，流线和涡量分布在选定的测量部分进行了系统的分析。比较情况1和情况2的实验结果：在自由表面、一侧壁和底部选定的测量段上，漩涡的数量和强度随着水位的升高而减小。此外，两种情况下的另一侧壁截面上也没有形成明显的漩涡。在后壁截面上，情况1的涡数比情况2的多，但在同一截面上，情况1的涡强度和尺度比情况2的小。
In the present paper, in order to improve and understand of various vortices which form in pump intake, a stereo PIV (Particle Image Velocimetry) technique has been used to investigate the vortex flows in a model pump intake comprising a vertical intake pipe with a bell mouth in a horizontal hexahedral intake under conditions of consistent flow rate and different water level. Two different flow regimes are observed for two cases: a “critical water level (CWL)” for a critical flow rate (case 1); a “higher water level” for a consistent flow rate with previous one (case 2), and the velocity vector, streamline and vorticity distributions on selected measurement sections are analyzed systematically. Comparing the experimental results between case 1 and 2: the number and strength of the vortex decrease with the increase of the water level on selected measurement sections of the free surface, one sidewall and floor. Moreover, there is not any distinct vortex formed on the section of another side wall for two cases neither. The number of vortex on the section of the back wall for case 1 is more than that for case 2, but the strength and the scale for case 1 are lower than that for case 2 on the same section.