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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.
김규완(Gyu Wan Kim),김윤상(Yun Sang Kim),Zhang Guang,Tokitada Hashimoto,Toshiaki Setoguchi,김희동(Heuy Dong Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study basic research was carried out to obtain the fundamental data of the needle-free injection system with powder injection. Improved needle-free injector was designed and manufactured. In addition, we measured the velocity of the powder particles, this was performed by simply visualizing the macro mode traveling at supersonic velocity to measure the number of milliliters of the square particles with high spatial and temporal resolution using high-speed video camera. The velocity data were acquired by the particle tracking velocimetry method after image processing.