摘要
本文采用大涡模拟方法,对双吸离心泵叶轮在不同交错角度下的内部流场进行非定常数值模拟,重点分析交错角度的变化对离心泵蜗壳内部非定常流场的影响。研究结果表明随着交错角度的增大,双吸离心泵效率和扬程整体上略有下降。叶片交错角度变化对蜗壳压力内部的横向流动也有一定影响,随着叶轮交错角度的增加,横向流动的旋涡面积和强度略有减小。不同交错角度下,蜗壳内压力脉动频域值均以叶片通过频率为主,并且随着交错角度的增大,压力脉动幅值呈现逐渐变小的趋势。当叶片均匀交错时,其脉动幅值降低了约70%。
The large eddy simulation method is used for staggered unsteady numerical simulation by double suction centrifugal pump impeller at different angles of the internal flow field. Attention is fixed on the changes of stagger angle on the volute of a centrifugal pump effect of non steady flow. The results show that the efficiency and head of the double suction centrifugal pump is decreased slightly with the increase of the staggered angle. The transverse flow of the internal pressure of the spiral case has some influence on the cross angle of the blade,and the vortex area and the strength of the transverse flow decreases with the increase of the cross angle of the impeller. The pressure fluctuation frequency domain of spiral case is dominated by the blade passing frequency under different staggered angles and the blade passing frequency decreases with the increase of staggered angle. When the impeller configuration is evenly staggered,the level of pressure fluctuation can be reduced about 70% .
作者
周晓红
刘国营
胡永金
陈伟
刘涛
ZHOU Xiaohong;LIU Guoying;HU Yongjin;CHEN Wei;LIU Tao(School of Science and Mathematics, Hubei University of Automotive Technology, Shiyan 442002, Chin)
出处
《水电与抽水蓄能》
2018年第2期82-85,61,共5页
Hydropower and Pumped Storage
基金
国家自然科学基金资助项目(11674113)
关键词
双吸离心泵
交错角度
内部流场
数值模拟
double suction centrifugal pump
large eddysimulation
stagger angle
internal flow field
