In technological processes of various plants and facilities, steam and gas at excess pressure is often vented. As a result of such emissions, underexpanded supersonic turbulent jets are formed, which create a sound field exceeding background levels by up to 30...40 dBA within a radius of several kilometers. Forecasting noise characteristics of air venting of steam and gas is important even at the design stage, to facilitate the development of noise control measures. Here, on the basis of research led by the authors, results are presented for the numerical simulation of the venting of underexpanded steam and gas jets into the atmosphere. The specific mechanism of noise formation and a new method of predicting the noise characteristics of steam jets are also presented.
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