Numerical Simulation and Spectrum Analysis on Valve Vibration Induced by Fluid Flow

Flow field instability has obvious contribution to the vibration of control valve which is widely used in engineering, and sometimes it is even the main reason. In this paper, pressure fluctuation in different crucial positions of the valve has been measured throughout all of the pre-opening sleeve valve experiment when the vibration of stem has been monitored. The experiment shows that the vibration of stem is severe at the condition of valve large opening, at which pressure fluctuation also reaches the largest value. The spectrum analysis shows that, frequency will change with different working conditions, and most of it is below 15Hz. The frequency range of 3.8~4.1Hz, which is resonant with the valve core´s first-order intrinsic frequency, appears in the test when the stem vibrates severely. In the meantime, through the numerical simulation, the structure of throttling window and valve disc wall of sleeve valve has obvious influence on flow field. The instability induced by solid-structure interaction is the major factor of the valve vibration.