﻿ 旋转射流的涡声问题研究

# 旋转射流的涡声问题研究Research on the Rotating Jet Noise Based on the Vortex-Sound Theory

The internal flow and outflow field characteristics, and sound propagation problems of the rotating jet fan with the behind guide vanes are studied using the combination of the unsteady flow and large eddy simulation. The main conclusions are as follows: the pitch between the impeller and the guide vanes has a bigger adjustable space; the rotor blades is the main sound source surface, the Karman vortex and tip leakage vortex, and channel vortex near the wall from the leading edge is characteristics vortex of the moving blades, the sound sources of vortex generators is located in the leading and trailing edge; the turbulent viscosity and effective viscosity of outflow field intensifies the dissipation of the turbulent sound; the pressure characteristics of time and frequency shows a positive correlation to that of the sound pressure, the radiation of sound pressure mainly point to the axis around.

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