无阻塞潜水磨碎泵的空化及压力脉动特性研究

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摘要由于磨碎泵在实际运行中刀盘的流道容易发生堵塞，本文主要模拟磨碎泵静刀盘的刀盘流道堵塞情况对磨碎泵性能的影响，该模拟基于ANSYS-CFX14.0软件分别对无阻塞潜水磨碎泵模型进行定常和非定常计算，并对无阻塞潜水磨碎泵的外特性进行了试验验证。分别堵塞磨碎泵静刀盘流道的1/4、1/3、1/2，通过对不同的流道堵塞工况分析发现：随着流道堵塞程度的增加，潜水磨碎泵的扬程整体下降，潜水磨碎泵的功率整体下降，效率降低，且最高效率点向小流量区域移动，可发现当堵塞静刀盘流道的1/4、1/3时，对磨碎泵的扬程、效率和功率的影响不大，堵塞1/2时，磨碎泵的扬程和效率下降明显，即堵塞不严重的工况下，磨碎泵的水力性能所受影响很小；随着流道堵塞程度的增加，刀头附近的空化程度在加剧，当堵塞比达到一定程度时，叶轮进口背面也开始发生空化；静刀盘流道内压力脉动脉动能量最大，且随着远离静刀盘流道位置的脉动能量降低，动静刀盘的动静干涉作用是影响动刀盘和靠近静刀盘流道的监测点压力脉动的最主要因素，且随着流量的增加，各个监测点主频幅值均有所降低。

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关键词 ：磨碎泵, 动静刀盘, 空化, 无堵塞, 压力脉动

Abstract：In the actual operation, the jam of the submerged grinder pump cutter channel is easy to occur. In this paper mainly simulate the effect of grinding pump static cutter channel congestion on the pump performance, the simulation based on the software of ANSYS-CFX14.0 to make steady and unsteady calculations and experimental verification for the characteristics of the pump. To respectively clog 1/4, 1/3, 1/2 channel of static cutter grinding runner , and through the different channel blockage condition analysis found:With the increasing degree of runner blockage, the pump head overall drop, the power decline,the efficiency reduced ,and maximum efficiency point moves to the small flow conditions,when clog 1/4, 1/3 channel of static cutter grinding runner, which had little effect on the ground pump head, but when clog 1/2 channel ,the pump head and efficiency decreased significantly;with the increasing degree of runner blockage,the cavitation adjacent to cutters intensified become more serious,the cavitation of impeller inlet on the back also become more serious,with the increase of the flow,the monitoring points pressure pulsation fluctuations on the knife disk reduced, the monitoring points pressure pulsation fluctuations on stationary cutter increased, the pulsating energy of pressure pulsation in the static blade channel is the largest, and the pulsating energy away from the stationary cutter runner reduced.

Key words： grinder pump movement cutter cavitation;non-jamed;pressure pulsation

收稿日期: 2015-06-16 出版日期: 2016-08-25

引用本文:

付强1,卢永刚1,朱荣生1,王秀礼1,王学吉1 . 无阻塞潜水磨碎泵的空化及压力脉动特性研究[J]. 振动与冲击, 2016, 35(17): 95-101.
Fu Qiang1 Lu Yonggang1 Zhu Rongshen1 Wang Xiuli1 Wang Xueji1. Research of cavitation and pressure pulsation of non-jamed submerged grinder pump. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(17): 95-101.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2016/V35/I17/95

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