摘要
从近壁区湍流拟序结构出发,研究离心泵内的空泡运动规律。首先利用空泡的Morrison方程得出了近壁区法向运动速度upx,然后基于拟序结构推导出了空泡在"扫掠"情况下的流向速度upy,最后用两个速度得到了基于近壁拟序结构的离心泵内的空泡对叶轮壁面的冲击角。研究表明离心泵内正是由于近壁区拟序时的"扫掠"作用造成了沙粒对叶轮壁面以小角度的冲击破坏,这与前人的试验观测结果基本吻合。
The bubble motion in the centrifugal pump was investigated based on the coherent structure in the near-wall region. First, the Morrison equation of bubble was used to determine the normal velocity in the near-wall region. Then, the flow velocity of bubble was obtained based on the coherent structure under the ＂sweep＂ conditions. Finally, the shock angle of bubble in the centrifugal pump with coherent structure on the impeller wall was obtained based on the above two velocities. . The results showed that the ＂sweep＂ effects of coherent structure in the near-wall region of the centrifugal pump can cause the small-angle shock failure from the sand to the impeller wall, which was in coincidence with the previous research results.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2013年第6期106-109,共4页
South-to-North Water Transfers and Water Science & Technology
关键词
近壁区湍流
拟序结构
离心泵
空泡
空蚀
扫掠
near-wall turbulent
coherent structure
centrifugal pump
bubble
cavitation
sweep
