소음진동 (Journal of KSNVE)
- 제9권1호
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- Pages.113-120
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- 1999
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- 1226-0924(pISSN)
다공관형 초음속 배기노즐의 공력소음에 관한 연구
A Study on the Aerodynamic Noise of a Supersonic Exhaust Nozzle of Perforated Tube
초록
A perforated tube nozzle as an exhaust noise suppressor of a high-speed civil transport(HSCT) is proposed. The experimental results for the near and far field sound. the visualization of jet structures and the static pressure distributions in the jet passing through a perforated tube are presented and discussed in comparison with those for a simple tube. It is shown that the perforated tube has an excellent performance to greatly reduce the shock-associated noise and that also the turbulent mixing noise is reduced in the range of a limited jet pressure ratio. This considerable noise reduction is due to the pressure relief caused by the through-flow through the perforated holes. Such a pressure relief results in the transformation of normal shock waves into weak Mach waves of X -type and increases the thrust force of the perforated tube nozzle.
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