Elimination of gas dynamic resonance modes of vibration loads of gas distribution station pipeline fitting

Abstract

The article contains a study of the modes of resonance interaction of a high-speed gas flow exiting from the metering sections of pressure regulators with their elements. It is shown that the interaction leads to a significant increase of the valve noise due to the tone component of the spectrum of vibration energy which occurs at the frequency characteristics of pressure fluctuations in the pipeline, the vibration of the controller output flange, as well as the external valve noise. The results of analyzing the prerequisites for resonant interaction of the gas flow with the regulator structural elements including the pylons of the central fairing are presented in the paper. It is shown that an increase in the output flow rate above a certain value (about 40 m / s) gives rise to discrete components of the spectrum of pressure fluctuations. The results of experimental analysis of the pressure regulator elements showing practical coincidence of the frequencies of discrete components of the flow pulsation spectrum and free oscillations of construction elements are also presented. Modal analysis of the natural oscillations of regulator elements is performed by tapping. Measures to remove resonant interaction of the output flow with the pylons that consist in installing special flow-splitting structures - perforated cylindrical sleeves are proposed. Other measures to eliminate the resonant interaction under consideration are also possible.