航天推进技术研究院主办
[1]严俊峰,陈 晖,逯婉若.泵-管路系统的汽蚀自激振荡特性分析[J].火箭推进,2015,41(05):29-33.
YAN Junfeng,CHEN Hui,LU Wanruo.Analysis on characteristics of self-excited cavitation oscillation in pump-piping system[J].Journal of Rocket Propulsion,2015,41(05):29-33.
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YAN Junfeng,CHEN Hui,LU Wanruo.Analysis on characteristics of self-excited cavitation oscillation in pump-piping system[J].Journal of Rocket Propulsion,2015,41(05):29-33.
泵-管路系统的汽蚀自激振荡特性分析
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
41
期数:
2015年05期
页码:
29-33
栏目:
研究与设计
出版日期:
2015-10-31
- Title:
- Analysis on characteristics of self-excited cavitation oscillation in pump-piping system
- Keywords:
- centrifugal pump; piping system; self-excited cavitation oscillation; dynamic characteristic; limit cycle
- 分类号:
- V434-34
- 文献标志码:
- A
- 摘要:
- 在带诱导轮离心泵试验中，当泵流量很小时，泵进出口压力均出现了幅值未发生衰减的低频振荡，这与高速离心泵的频率特征形成对比，表明泵-管路系统内发生了自激振荡。泵在小流量下工作时，会出现与主流区强烈作用的回流区，该反向回流在诱导轮叶片工作面上形成漩涡并随诱导轮一起旋转，引起主流液体的静压降低及空泡体积的周期性变化，由此产生了汽蚀自激振荡。利用空泡动力学模型对低频汽蚀自激振荡特性进行计算，得到了带诱导轮离心泵－管路系统的振荡频率、进口压力及流量的动态特性、流量-进口压力极限环等。结果表明，计算的汽蚀自激振荡特性与试验值接近，汽蚀自激振荡数学模型合理可行；泵转速及进口管长度越小，泵进口压力和流量越大，汽蚀自激振荡的频率就越大。
- Abstract:
- The low frequency oscillation of inlet pressure and outlet pressure occurred in an inducer-centrifugal pump test when flow in the pump was small, which contrasts with the frequency characteristics of high speed centrifugal pump. This indicates that the self-excited oscillation occurs in the pump-piping system. When the pump is operating at off-design conditions, the backflow zone intensively interacting with main flow zone may appear. This backflow is rotated with the inducer, which will decrease the static pressure of the mainstream liquid and result in a periodical change of the physalides volume, and then the self-excited cavitation oscillation occurs. In order to analyze the characteristics of the self-excited cavitation oscillation, a novel cavitation dynamic model is presented to simulate the dynamic characteristic to capture the oscillation frequency in the pump-piping system, the dynamic characteristics of inlet pressure and flow rate, and the limit cycle of flow rate versus inlet pressure. The results of numerical experiments indicate that the calculated characteristics of self-excited cavitation oscillation is consistent with experimental result, this cavitation self-excited mathematic model is suitable to simulate the characteristics of the self-excited cavitation oscillation. The oscillation frequency increases with decrease of the pump speed and the length of inlet piping, while the oscillation frequency decreases with decrease of the inlet pressure and the flow rate.
参考文献/References:
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YAN Junfeng, CHEN Wei. Optimum design of low- specific-speed high speed centrifugal pump based on genetic algorithm[J]. Journal of Rocket Propulsion, 2006, 32(3):1-7.
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备注/Memo
收稿日期：2015-04-23；修回日期：2015-06-08 作者简介：严俊峰（1980—），男，硕士，高级工程师，研究领域为涡轮泵设计
更新日期/Last Update:
1900-01-01