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http://dx.doi.org/10.5139/JKSAS.2007.35.1.027

Experimental study on the Supersonic Jet Noise and Its Prediction  

Lim, Dong-Hwa (충남대학교 항공우주공학과 대학원)
Ko, Young-Sung (충남대학교 항공우주공학과)
Choi, Jong-Soo (충남대학교 항공우주공학과)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.35, no.1, 2007 , pp. 27-32 More about this Journal
Abstract
this paper the acoustic signature from a supersonic nozzle is measured and compared to the result of a program developed for a gas turbine noise prediction. In order to measure the jet Mach Number, the pressure and temperature at the settling chamber was measured along with pressures from a pitot-tube placed near the exit. The results are also compared to the ones obtained with a shadow graph technique. Jet noise produced by an imperfectly expanded jet contains shock associated noise, which consist of broadband noise and screech tone noise. For subsonic condition, the directivity is dominant to the downstream direction due to turbulence mixing noise. For supersonic conditions, however, the directivity is dominant toward upstream direction due to shock associated noise. The comparison with a jet exhaust noise prediction code shows good agreement at supersonic conditions but needs to be improved at subsonic speeds.
Keywords
Jet Noise; Turbulent Mixing Noise; Broadband Shock Associated Noise; Screech Tone;
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