CONTRIBUTION OF NON-ISOTHERMAL JETS TO THE PROCESSES OF NOISE GENERATION OF ENERGY MACHINES WHEN INSTALLING SILENCERS

Abstrakt

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.