弁絞りによる配管管壁と管内高次音響モードとの連成振動

概要

論文の詳細を見る
When pipe wall vibrations are coupled with its internal acoustic waves in the cricumferential and axial mode, the pipe wall vibrations are presumed to add to the coupling frequencies. The coupling frequency is dependent on acoustic wave speed, pipe wall diameter and thickness. In this study, it is experimentally examined how flow turbulence caused by valve choking excites the coupling vibration. In this experiment, the fluid is air, and the pipe diameter is about 100 mm. The predicted coupling frequencies are about 2 kHz and 3. 5 kHz. Valve choking, the pressure condition for which is near or above the critical pressure ratio, causes flow turbulence with broadband frequencies. Referring to the experimental results, the relationship between the coupling vibration and the pressure ratio at the choking valve is discussed. It is confirmed that valve choking can induce large pipe wall coupling vibrations and noise.
社団法人日本機械学会の論文
1995-09-25