LABORATORY MODELING OF THE PROCESSES OF SOUND EXCITATION BY SELF-OSCILLATING REGIMES IN FLOWS IN HEAT-EXCHANGE-SYSTEMS' PIPELINES

The authors have performed laboratory modeling of noise-emission processes in turbulent fl ows of the heattransfer agent in shutoff and control valves of a pipeline. Experiments were conducted on an aeroacoustic bench consisting of a model of the fl ow chamber of shutoff and control valves (parallelepiped), inlet and outlet tubes, an exhaust fan, and a baffl e chamber. Parallel measurements of velocity fi elds were performed by the PIV method, and of acoustic characteristics, with a microphone. The experiments were conducted with different widths of the gaps between the tubes in the fl ow-chamber model. At certain values of the gaps, tone sounding was recorded at frequencies of 340 and 680 Hz by the microphone, which, as subsequently shown by results of the velocityfi eld measurements, is a consequence of the self-oscillating fl ow regime occurring with a periodic separation of vortices whose scale is comparable with the gap width in the fl ow chamber
   
Author:  D. A. Sergeev ,  A. A. Kandaurov ,  A. V. Stulenkov ,  A. S. Suvorov
Keywords:  self-oscillations, fl ows in pipelines, sound, laboratory modeling
Page:  402