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신현동(Hyun-Dong Shin),이영기(Young-Ki Lee),김희동(Heuy-Dong Kim),?戶口俊明(Toshiaki Setoguchi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
When a shock wave arrives at a duct, an impulsive wave is discharged from the duct exit and causes serious noise and vibration problems. In the current study, the characteristics of the impulsive wave discharged from a partial closed duct exit is numerically investigated using a CFD method. The Yee-Roe- Davis’s total variation diminishing(TVD) scheme is used to solve the axisymmetric, unsteady, compressible Euler equations. With several partial closed duct exits, the Mach number of the incident shock wave M<SUB>s</SUB> and the distance L/D between the duct exit and a flat plate are varied in the range of M<SUB>s</SUB> = 1.01 ~ 1.50 and L/D = 1.0 ~ 4.0, respectively. The results obtained show that the magnitude of the impulsive wave impinging upon the flat plate strongly depends upon M<SUB>s</SUB>, L/D and the partial closure of duct exit. The impulsive wave on the flat plate can be considerably alleviated by the partial closure of duct exit and, thus, the present method can be a passive control for the impulsive wave.