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Control of the Asymmetric Flow in a Supersonic Nozzle
Shigeru Matsuo,Toshiaki Setoguchi,Tokitada Hashimoto,Seiya Tokuda,Junji Nagao,Heuy-Dong Kim(김희동) 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.2
Several previous works on rocket nozzle flows have revealed thc existencc of the transition from FSS to RSS and the occurrence of asymmetric flow associated with the boundary layer separation, which can cause excessive side-loads of the propulsion system. Thus, it is of practical importance to investigate the asymmetric flow behaviors of the propulsion nozzlc and to develop its control method. In the present study, the asymmetric flow control method using a cavity system was applied to supersonic nozzle flow. Time-dependent asymmetric flow was experimcntally investigated with the rate of change of the nozzle pressure ratio. The results obtained showed that the cavity systcm installed on nozzle wall would be helpful in fixing the unsteady motions of the boundary layer separation, consequcntly reducing the possibility of the occurrence of the asymmetric flow.
Passive Control of the Pressure Oscillations in Supersonic Cavity Flows
강현구(Hyun-Goo Kang),김재형(Jae-Hyung Kim),Toshiaki Setoguchi,Shigeru Matsuo,김희동(Heuy-Dong Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
A computational fluid dynamics method has been applied to investigate the intense pressure oscillations that occur in a rectangular cavity at Mach number 1.83. Special consideration has made to get a passive control strategy which can effectively suppress the cavity pressure oscillations. The leading edge extension of rectangular cavity has been selected as a passive geometry for the present control method. In the present computations, a third-order TVD (Total Variation Diminishing) finite difference scheme with MUSCL was used to discretize the spatial derivatives and a second order-central difference scheme for the viscous terms, and a second-order fractional step was employed for time integration. The results obtained showed a considerable decrease in the amplitudes of pressure oscillations with the present control.