摘要
为研究导叶和环形蜗室周向相对位置对离心泵叶轮径向力的影响,以某配有导叶和环形蜗室的离心泵为研究对象,设计相对位置角α分别为0°,10°,20°和30°的4套计算方案.采用ANSYS CFX对泵内全流场进行非定常的数值模拟,并通过试验对数值计算结果进行验证.基于数值计算结果,分析了导叶和环形蜗室不同相对位置下泵能量性能和叶轮径向力的变化规律.结果表明:α的变化对泵能量性能有明显的影响,不同的α,扬程的最大变化为1.95%,效率的最大变化为1.39%,且α=20°时,其能量特性最优;随着α的增大,径向力脉动的幅值先减小后增大,α=20°,其脉动幅值最小,为最大脉动幅值的80%;随着α的增大,径向力脉动的主频先增加后减小,主频和次频对应的脉动幅值则先减小后增加,α=20°时,主频和次频处的脉动幅值最小;α的改变会对径向力矢量的分布产生影响,当α=0°和30°时,其分布具有较强的规律性,且α=0°时,其分布更有利于离心泵的长期运行.
In order to study effect of circumferential setting position of diffuser in concentric volute on impeller radial thrust, a specific centrifugal pump with diffuser and concentric volute as well as impel- ler was used as the model, four design cases where the angle ot between the trailing edge of the blade pressure side of the diffuser and the volute discharge nozzle wall were considered to be 0°, 10° ,20° and 30°, respectively. Based on ANSYS CFX, unsteady numerical simulations of the whole flow field in those cases were conducted, the predicted head and efficiency are validated with the measurement. Further, the effects of a on performance and impeller radial thrust are clarified, h is identified that the maximal variations in head and efficiency are 1.95% and 1.39% , respectively, and the best pump performance is achieved at α = 20°. With the increase of c~, the amplitude of radial thrust pulsation firstly decreases but increases eventually. At α = 20°, the amplitude reaches tile minimum value, which is 80% of the largest amplitude. However, the dominant frequencies of radial thrust pulsation initially increase and then decrease with increasing α. At α = 20°, the amplitudes of the first and se- cond dominant frequencies reach the minimum values. The change of α can influence the distribution of radial thpast vector, and the distribution shows an obviously regular pattern at α = 20° and 30°. Particu- larly, the distrihution at α = 20° may be more suitable for a long-term operation of this kind of pumps.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2016年第3期204-209,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
"十二五"国家科技支撑计划项目(2013BAK06B02)
国家自然科学基金资助项目(51209105)
江苏省六大人才高峰计划项目(ZBZZ-040)
关键词
离心泵
导叶
环形蜗室
相对位置
径向力
centrifugal pump
guide vane
annular casing
relative position
radial force
