摘要
针对管路系统中活塞式流量调节阀内非定常流动时所产生的空化现象和共振问题,基于Schnerr-Sauer空化模型和标准k-ε湍流模型,进行非定常空化流场计算,以三个典型开度为例分析活塞式流量调节阀空化特性以及压力脉动的响应.通过对调节阀内部流场仿真模拟及压力脉动特性分析可知:活塞式流量调节阀防空化能力较强,但在节流处附近容易发生小范围的空化现象;流道内压力脉动主要集中于阀后高流速区域,近壁面压力脉动主要集中在节流处,并且沿流动方向衰减;调节阀在工作过程中压力脉动主要集中在较低频率,近壁面压力脉动频率集中在20 Hz以内,随着开度增大压力脉动阈值与振幅会有所上升.
Based on Schnerr-Sauer cavitation model and standard k-ε turbulence model,the cavitation characteristics and the response of pressure pulsation of piston type flow control valve were analyzed.Through the simulation of flow field inside the control valve and the analysis of pressure pulsation characteristic,it is concluded that the piston type flow control valve has strong anti-air defense capability,but it is prone to cavitation in a small range near the throttling place.The pressure pulsation in the flow passage is mainly concentrated in the high velocity area behind the valve,while the pressure pulsation near the wall is mainly concentrated in the throttling and attenuates along the flow direction.In the working process of the regulator valve,the pressure pulsation is mainly concentrated in the lower frequency,and the pressure pulsation frequency near the wall is concentrated within 20 Hz.With the increase of the opening degree,the pressure pulsation threshold and amplitude will rise somewhat.
作者
李树勋
沈恒云
张万年
赵玉龙
LI Shuxun;SHEN Hengyun;ZHANG Wannian;ZHAO Yulong(School of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China;Anhui Tongdu Fluid Technology Co.Ltd.,Tongling 244000,Anhui China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第12期44-48,54,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51569012)。
关键词
压力脉动
调节阀
空化特性
仿真模拟
傅里叶变换
频域
pressure pulsation
regulator valve
cavitation characteristics
simulation
Fourier transform
frequency domain
