scholarly journals Experimental study on screech tone mode switching of supersonic jet flowing through rectangular nozzles

2015 ◽  
Vol 64 (5) ◽  
pp. 054703
Author(s):  
Chen Zhe ◽  
Wu Jiu-Hui ◽  
Chen Xin ◽  
Lei Hao ◽  
Hou Jie-Jie
Keyword(s):  
Experimental Study ◽  
Supersonic Jet ◽  
Mode Switching ◽  
Screech Tone

Experimental Study of Supersonic Jet Noise Reduction With Microjet Injection

2009 ◽  
Author(s):  
Toshinori Watanabe ◽  
Ryuichi Okada ◽  
Seiji Uzawa ◽  
Takehiro Himeno ◽  
Tsutomu Oishi
Keyword(s):  
Experimental Study ◽  
Turbulent Mixing ◽  
Sound Pressure ◽  
Supersonic Jet ◽  
Jet Noise ◽  
Pressure Level ◽  
Broadband Noise ◽  
Screech Tone ◽  
Supersonic Jet Noise ◽  
Mixing Noise

Experimental study was conducted concerning active control of supersonic jet noise with a microjet injection technique. The microjets were injected into a rectangular main jet with Mach number up to 1.49. The nozzle lip of the main jet was equipped with 44 injection holes of the microjets, whose angles against the main jet were changed as 60 and 90 degrees. From far-field sound pressure data, a significant reduction of the jet noise by several dB was found in the cases with 60 and 90 degrees of injection angles. The microjet was found to affect all components of supersonic jet noise, namely, turbulent mixing noise, shock-associated broadband noise and screech tone noise. In the results of FFT analysis, the effect of the microjet was observed in the sound pressure level of the shock-associated broadband noise, the pressure level and frequency of the screech tone noise, and average level of the turbulent mixing noise. Schlieren visualization was also made for the jet flow, and the microjet was seen to change the shock structure and shear layer behavior of the supersonic jet.

Screech Tone Noise and Mode Switching in Supersonic Swirling Jets

AIAA Journal ◽  
2000 ◽  
Vol 38 (1) ◽  
pp. 189-189
Author(s):  
Young-Kil Yu ◽  
Ruey-Hung Chen ◽  
Larry Chew
Keyword(s):  
Mode Switching ◽  
Swirling Jets ◽  
Screech Tone
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