Abstract
The aim of this work is the investigation of different outlets acoustic properties from the different air jets leakage, which flow out from outlets under varying conditions. Such holes as: rectangular chink for a compact air jet; rectangular chink with a bend for a flat air jet; round outlet for a swirl air jet; round outlet for air jets interaction; rectangular chink for the flat air jets interaction. In this article has been determined relationship between such factors as a noise level, air flow rate and inflow hole size at air jet leakage. There are considered some sources of noise: fan, vibration of ventilation piping metal walls and aerodynamic noise of the air jet flowing out from outlet. There has been designed the chart of sound level’s dependence from the initial air velocity and dimensionless outlet square. Obtained curves was approximated by equation. Comparing chart for the round, compact, swirl, flat air jets and their interaction, which flow out from a rectangular aperture with a bend, rectangular chink’s aperture and cylindrical pipe with a bend, we shall note that noise level is the highest at flowing out of flat jet in cause of a rectangular chink with a bend.
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