煤化工V型调节球阀空化与流激振动分析OA

In order to address the cavitation phenomenon and resonance problem caused by unsteady flow in V-type regulating ball valves in the coal chemical industry,the cavitation characteristics of its typical opening were investigated based on computational fluid dynamics,revealing the time-frequency domain characteristics of its pressure pulsation response,and its vibration characteristics were studied using thermal－fluid－structure interaction modal analysis.The results show that the severe cavitation area of the V-type regulating ball valve is located at the throttling part of the ball′s V-port and the dif-fuser hole of the rear valve seat.When the pressure difference between the inlet and outlet of the valve increase,and the cavitation distribution range as well as the gas phase volume fraction inside the valve also increase.The main frequency and amplitude of the pressure pulsation within the valve are concen-trated in the low-frequency region(0－100.00 Hz),and the smaller the opening,the wider the fre-quency domain of the pulsating pressure energy distribution.There are two main frequency peaks at the 30%opening.The main frequency in the low-frequency region corresponds to the frequency of large-scale cavitation clusters falling off,while the main frequency peak near 287.00 Hz corresponds to the frequency of small-scale cavitation clusters and collapsing.When resonance occurs,the maximum modal deformation of the ball valve is located at the pneumatic device,and the amplitude is greater than 7 mm.The ball shows two sets of amplitude peaks between 45.00－120.00 Hz and 266.25 Hz.The frequency of its amplitude mutation point corresponds to the intrinsic frequency of the valve,and is lo-cated in the pressure pulsation main frequency region,which can easily cause large-amplitude vibra-tions in the pipeline system.In addition,when the ball resonates,its oscillation amplitude is large,which easily causes frequent impacts and collisions with the valve seat sealing surface.This exacerbates the fretting wear between the sealing surface and the ball and easily leads to sealing leakage problems.