Suppression of Gas-dynamic Self-oscillations in the Outflow Line of a Gas Control Valve

This article considers investigation of the causes and characteristics of high-frequency gas-dynamic self-oscillations arising in the outflow line of gas control valves. We have demonstrated that these self-oscillations result in a substantial increase in the level of dynamic loading of the control valve elements due to occurrence of intense tonal spectra components of pressure fluctuations in the pipeline, vibrations of the output flange of the control valve, as well as external noise of the whole assembly. We have provided the results of the study of conditions for high-frequency gas-dynamic self-oscillations arising from the gas flow interaction with the control valve elements, as well as with supporting pylons of the central fairing. It is shown that an increase in the flow above a certain value of output speed (40 m/s) results in tonal spectrum components of pressure pulsations. We have described the measures to suppress gas-dynamic self-oscillations by means of a perforated sleeve installed in the outflow line of the control valve.