轴对称腔体内淹没射流空化的滞后效应

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摘要对轴对称腔体内淹没射流的空化流动特征进行了高速摄像观测和试验研究，得到了腔体内和下喷嘴出口管内流动的空化数与工作射流雷诺数（Re）的变化规律。试验研究发现，在一定的Re范围内，空化数随Re数发生跳跃变化，腔体内空化形态发生突变，空泡形态由突变前的小直径空泡剧变为突变后的大直径空泡。Re减小变化过程发生空化数跳跃的临界雷诺数小于Re增大变化过程发生空化数跳跃的临界雷诺数，两者存在滞后效应。在试验的腔长范围（6≤Lc/d1≤13）内，Re增大变化过程和Re减小变化过程的临界雷诺数均随腔长线性变化，但后者变化的斜率小于前者，滞后效应随着腔长的增长而扩大。

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关键词 ：淹没射流, 轴对称腔体, 空化, 滞后效应, 两相流动

Abstract：Experimental measurements and high speed video observations were carried out to study the cavitating flow properties of submerged jet in an axis-symmetrical cavity. The variations of cavitation numbers with Reynolds numbers (Re) of working jet were obtained in cavity chamber and outlet nozzle. From the experimental results, it was found that, in a certain range of Re, the cavitation number jumping variation occurred; and cavitating state changed suddenly in cavity chamber, which changed from small diameter bubbles to large diameter bubbles. The critical Reynolds numbers for cavitation number jump occurrence in decreasing process of working jet Re was smaller than that in increasing process of working jet Re, which showed a hysteresis property between two variation processes. In cavity chamber length range of experiments, the critical Reynolds numbers were linearly related to chamber lengths for both increasing and decreasing process of working jet Re variation, but the slope of cavitation number jump in decreasing process was smaller than in increasing process. The hysteresis properties enlarged as the chamber length growth.

Key words： submerged jet axis-symmetrical cavity cavitation hysteresis property two-phase flow

收稿日期: 2014-02-08 出版日期: 2015-09-25

引用本文:

王玉川 1，高传昌 2，谭磊 3，曹树良 3. 轴对称腔体内淹没射流空化的滞后效应[J]. 振动与冲击, 2015, 34(18): 118-122.
WANG Yuchuan 1 GAO Chuanchang 2 TAN Lei 3 CAO Shuliang 3. Hysteresis properties of submerged jet cavitation in axis-symmetrical cavity. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(18): 118-122.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2015/V34/I18/118

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