Visualization of the large-scale vortex structures in excited turbulent jets

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作者：

VF Kopiev，MY Zaitsev，SI Inshakov，LP Guriashkin

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摘要：

The present work is a part of the more common research aimed at establishing the role of large-scale vortex structures in the mechanism of noise generation by subsonic turbulent jet. The work presents the results of photography and videography of fast non-stationary processes in a circular subsonic jet under lateral acoustic excitation by harmonical source located upstream in a stilling chamber. Jet velocity varied in the range of 40–200 m/s (M=0.12–0.6).

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关键词：

Practical/ aeroacoustics computational fluid dynamics flow visualisation interferometers jets shear turbulence subsonic flow video recording vortices/ vortex structure visualization noise generation nonstationary process videography nonstationary process photography circular subsonic jet acoustic excitation stilling chamber jet velocity turbulent subsonic jet shear interferometer optical averaging technique 40 to 200 m/s/ A4755C Jets in fluid dynamics A4780 Measurement instrumentation and techniques for fluid dynamics A4710 General fluid dynamics theory, simulation and other computational methods A4725M Noise (turbulence generated) A4725F Boundary layer and shear turbulence A4730 Rotational flow, vortices, buoyancy and other flows involving body forces A4740D General subsonic flows C7320 Physics and chemistry computing / velocity 4.0E+01 to 2.0E+02 m/s