叶片数对低比转速离心泵性能影响分析

发布时间：2018-03-12 21:12

本文选题：离心泵　切入点：低比转速　出处：《热能动力工程》2017年08期 　论文类型：期刊论文

【摘要】：振动及空化是影响离心泵性能的重要因素。为了进一步优化流道,提高离心泵的性能,在保证离心泵其他参数不变的情况下,设计了3种不同叶片数叶轮。对3种离心泵进行全流道三维非定常湍流数值模拟,分析叶片数对离心泵性能的影响。结果显示:不同叶片数离心泵在两个监测点的压力脉动主频都是相对应的叶片通过频率,次频为叶片通过频率的倍频。叶片数的变化对隔舌处的压力脉动变化影响较大。随着叶片数的增加,离心泵的扬程逐渐增大,离心泵的效率变化比较复杂,当叶片数为5时,离心泵的效率最高。随着进口压力的不断降低,离心泵叶轮所受扭矩发生变化,在临界空化余量附近,泵扭矩发生陡降。
[Abstract]:Vibration and cavitation are important factors affecting the performance of centrifugal pump. In order to further optimize the flow channel and improve the performance of centrifugal pump, the other parameters of centrifugal pump are guaranteed to remain unchanged. Three kinds of impellers with different blades are designed. Three kinds of centrifugal pumps are numerically simulated with three dimensional unsteady turbulent flow channels. The effect of vane number on the performance of centrifugal pump is analyzed. The results show that the main frequency of pressure pulsation of centrifugal pump with different vane number at two monitoring points is the corresponding vane passing frequency. The secondary frequency is the double frequency of the blade passing frequency. The change of blade number has a great influence on the pressure pulsation of the tongue. With the increase of the blade number, the lift of centrifugal pump increases gradually, and the efficiency of centrifugal pump changes more complex, when the number of blades is 5:00, The efficiency of centrifugal pump is the highest. With the decreasing of inlet pressure, the torque of impeller of centrifugal pump changes, and the torque of pump drops sharply near the critical cavitation allowance.
【作者单位】：西华大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51379179) 西华大学研究生创新基金项目(ycjj2016096)
【分类号】：TH311

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