Unsteady flow characteristic of low-specific-speed centrifugal pump under different flow-rate conditions
Unsteady flow characteristic of low-specific-speed centrifugal pump under different flow-rate conditions
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DOI：
10.1007/s11630-015-0750-x
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发表时间：
2015-01
影响因子：
2.5
通讯作者：
B. Cui;Deshen Chen;Wen-jun Xu;Ying-zi Jin;Zuchao Zhu
中科院分区：
文献类型：
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作者：
B. Cui;Deshen Chen;Wen-jun Xu;Ying-zi Jin;Zuchao Zhu
为研究离心泵内的非定常流动特性，对低比转速复杂叶轮离心泵在不同工况下的流场进行了数值模拟。计算过程中采用RNG κ-ε湍流模型和滑移网格。结果表明，叶轮与蜗壳之间的相互作用导致流体的不稳定流动，造成蜗壳周向压力脉动分布不均匀。离心泵内压力脉动除主要频率及其倍频外，复杂叶轮长叶片引起的频率在低频区也起主导作用。舌部附近存在较大的波动现象。蜗壳壁面和叶片出口处的静压脉动频率组成基本相同，只是蜗壳壁面附近的脉动幅度有所减小。总的来说，流量的不同主要影响泵内脉动频率的幅值，而对频率组成的影响不大。
To investigate the unsteady flow characteristics in centrifugal pump, the flow field in a low-specific-speed centrifugal pump with complex impeller is numerically simulated under different conditions. The RNG κ-ɛ turbulence model and sliding mesh are adopted during the process of computation. The results show that the interaction between impeller and volute results in the unstable flow of the fluid, which causes the uneven distribution of pressure fluctuations around the circumference of volute. Besides the main frequency and its multiple frequency of pressure fluctuations in the centrifugal pump, the frequency caused by the long blades of complex impeller also plays a dominant role in the low-frequency areas. Furthermore, there exists biggish fluctuation phenomenon near the tongue. The composition of static pressure fluctuations frequency on the volute wall and blade outlet is similar except that the fluctuation amplitude near the volute wall reduces. In general, the different flow rates mainly have influence on the amplitude of fluctuation frequency in the pump, while have little effect on the frequency composition.