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역유동을 이용한 초음속 노즐에 작용하는 Pitching 효과에 대한 연구
임채민(C. M. Lim),김희동(H. D. Kim),瀨戶口俊明(T. Setoguchi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In the modern aerospace industry the fluidic thrust-vector control, with simpler design, got considerable attention than the mechanical thrust-vector control because of its simpler design, low maintenance cost, high maneuverability and low aerodynamics drag. In the recent past many studies have been reported on fluidic thrust-vector control, nevertheless the application of the fluidic thrust-vector control is still in the infant stage due the lack of understanding of the pitching effect and the flow field associated with separation, strong unsteadiness, and the shock wave and boundary layer interaction. In this paper, both experimental and computational studies have been reported to examine the pitching effect on a supersonic nozzle using the counter-flow concept. The results obtained from both experimental and computational studies show that, for a given nozzle pressure ratio, the thrust vector angle has a maximum value at a certain suction flow rate, which is almost 5% of the mass flow rate of the primary jet.
에어 제트 직기의 메인 노즐 유동에 관한 수치해석적 연구
임채민(C.-M. Lim),이호준(H.-J. Lee),노석홍(S.-H. Noh),이권희(K.-H. Lee),김희동(H.-D. Kim),전두환(D.-H. Chun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
An air jet loom as one of shuttleless looms transports a yarn into warps using viscosity and kinetic energy of an air jet. A performance of this picking system depends on the ability of instantaneous inhalation/exhaust, the configuration of nozzle, the operation characteristics of a check valve, and so on. In the recent past many studies have been reported on an air jet discharged from the nozzle exit, but studies for understanding of the flow field characteristics associated with shear layer, and shock wave and boundary layer interaction in the nozzle were not conducted enough. In this paper, computational study was performed to explain the flow field in the air jet nozzle with an acceleration tube of a very small divergent angle. The result obtained from computational study show that the flow field in the air jet nozzle depends on the nozzle configuration and the length of acceleration tube.