TY - GEN

T1 - Computational analysis of mach number effects on edgetone

AU - Nonomura, Taku

AU - Muranaka, Hiroko

AU - Fujii, Kozo

PY - 2006

Y1 - 2006

N2 - In this study, Mach number effect on edgetone is investigated to verify the feedback-loop of edgetone using the high-order computation. The computational results show three clear points. When the Mach number increases independently, 1) the edgetone phenomenon tends to cease 2) the frequency of edgetone becomes lower 3) the oscillation mode (which is named stage) of edgetone becomes lower. The second point shows that the edgetone mechanism is explained by the fluid-acoustic feedback-loop. As for the Powell's feedback-loop equation our computational results show that phase-lag p is constant Therefore the feedback-loop equation is verified to be physically correct. However the computed value of p is -0.2 which does not correspond to that of Powell's suggestion.

AB - In this study, Mach number effect on edgetone is investigated to verify the feedback-loop of edgetone using the high-order computation. The computational results show three clear points. When the Mach number increases independently, 1) the edgetone phenomenon tends to cease 2) the frequency of edgetone becomes lower 3) the oscillation mode (which is named stage) of edgetone becomes lower. The second point shows that the edgetone mechanism is explained by the fluid-acoustic feedback-loop. As for the Powell's feedback-loop equation our computational results show that phase-lag p is constant Therefore the feedback-loop equation is verified to be physically correct. However the computed value of p is -0.2 which does not correspond to that of Powell's suggestion.

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M3 - Conference contribution

AN - SCOPUS:33845276535

SN - 1563478102

SN - 9781563478109

T3 - Collection of Technical Papers - 36th AIAA Fluid Dynamics Conference

SP - 139

EP - 152

BT - Collection of Technical Papers - 36th AIAA Fluid Dynamics Conference

PB - AIAA International

T2 - 36th AIAA Fluid Dynamics Confernce

Y2 - 5 June 2006 through 8 June 2006

ER -