Constructive schemes of noise mufflers of power plants developed by the authors of paper are described. A special set-up has been developed on the basis of a mobile compressor station, the main element of which is an internal combustion engine. Based on the results of tests of noise mufflers, it is concluded that the use of the proposed samples of mufflers can achieve a significant effect of reducing the noise of power plants of various types.
The method of James Lighthill is known and widely used, which allows determining the acoustic power of isothermal jets.
A mathematical model for calculating the acoustic parameters (sound power, radiation pattern) of non-isothermal sound jets is proposed,
taking into account the noise silencer installed in the gas exhaust tract. At the output, the equations of continuity, the amount
of motion, energy, as well as the Lighthill wave equation are used. A statistical model is used as a turbulence model for calculations.
A physical mechanism of noise generation by turbulent flows is proposed, which consists in considering "own" and "shear" noise. The
" own " noise is caused by turbulent pulsations of the gas-dynamic flow, the "shift" noise is caused by the presence of a flow velocity
gradient. Analytical dependences of the components of "own" and "shift" noise are obtained.
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