调节阀内非定常空化压力脉动特性分析

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摘要基于计算流体动力学方法，数值研究了液压调节阀内非定常流动及其压力脉动特性. 通过对近壁面的压力信号进行频谱分析，讨论了空化形态的变化过程与壁面压力波动之间的关系. 结果表明：调节阀内云状空穴变化呈现出准周期性的发展过程，空化频率为565Hz，其空化变化过程包括：附着型空穴生长、附着型空穴断裂和脱落以及游离型空穴生长和溃灭. 空穴尾部近壁面处的逆压力梯度是引起反向射流的主要原因，反向射流与主流相切形成漩涡，促使附着型空穴脱落. 此外，空穴发展变化也对流道内压力脉动产生影响，阀内不同截面上的平均压力变化具有相同的主导频率，且该频率与附着型空穴非定常准周期生长、断裂、脱落频率基本吻合.
关键词调节阀；非定常空化流动；反向射流；压力脉动；数值模拟

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	刘秀梅1
	谢永伟1
	李贝贝1
	贺杰2
	陈劲松1

关键词 ：调节阀, 非定常空化流动, 反向射流, 压力脉动, 数值模拟

Abstract：The unsteady flow in a hydraulic regulating valve was numerically studied based on a computational fluid dynamics (CFD) method. Spectral analysis was conducted for pressure signals, and the correlation between the unsteady cavity behaviors and the pressure fluctuations was discussed. The results showed that a typical quasi-periodic process of cloud cavitation development is characterized by the process of attached cavity growth, attached cavity shedding, and the growth and collapse of cloud cavities. The periodic frequency of cavitation is 565Hz. The pressure gradient at the end of the attached cavity near the wall is the main cause of the reverse jet, and then the vortex is formed to make the attached cavity shedding. At the same time, the development of shedding also affects the pressure pulsation in the flow passage. The average pressure variation in different sections of the valve has the same dominant frequency, and the frequency is basically consistent with the unsteady quasi-periodic breaking and shedding frequency of the shedding.
Key words regulating valve; unsteady cavitation flow; re-entrant jet; pressure fluctuation; numerical simulation

Key words： regulating valve unsteady cavitation flow re-entrant jet pressure fluctuation; numerical simulation

收稿日期: 2021-03-17 出版日期: 2022-10-15

引用本文:

刘秀梅1，谢永伟1，李贝贝1，贺杰2，陈劲松1. 调节阀内非定常空化压力脉动特性分析[J]. 振动与冲击, 2022, 41(19): 282-288.
LIU Xiumei1, XIE Yongwei1, LI Beibei1, HE Jie2, CHEN Jinsong1. Transient cavitation pressure fluctuation characteristics in regulating valve. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(19): 282-288.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I19/282

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