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NUMERICAL ANALYSIS OF INTERACTION BETWEEN SUPERSONIC JET AND PERPENDICULAR PLATE
Yasunobu T,Matsuoka T,Kashimura H,Setoguchi T Korea Society of Computational Fluids Engineering 2005 한국전산유체공학회지 Vol.10 No.1
The numerical investigation of the interaction between the underexpanded supersonic jet and the perpendicular plate is carried out using the TVD numerical method. The wave structure in the flowfield and the pressure and temperature distributions on the plate surface are obtained by the numerical analysis. Especially, the influence of self-induced flow oscillation caused by the impinging jet and the characteristic of impinging jet are shown. From the result of the numerical analysis, it is concluded that the pressure and the temperature fluctuations on the plate surface strongly depends on the pressure ratio in the flowfield and the position of plate.
NUMERICAL ANALYSIS OF INTERACTION BETWEEN SUPERSONIC JET AND PERPENDICULAR PLATE
T. Yasunobu,T. Matsuoka,H. Kashimura,T. Setoguchi 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.1
The numerical investigation of the interaction between the underexpanded supersonic jet and the perpendicular plate is carried out using the TVD numerical method. The wave structure in the flowfield and the pressure and temperature distributions on the plate surface are obtained by the numerical analysis. Especially, the influence of self-induced flow oscillation caused by the impinging jet and the characteristic of impinging jet are shown. From the result of the numerical analysis, it is concluded that the pressure and the temperature fluctuations on the plate surface strongly depends on the pressure ratio in the flowfield and the position of plate.
PASSlVE SHOCK CONTROL IN TRANSONIC FLOW FIELD
Matsuo S,Tanaka M,Setoguchi T,Kashimura H,Yasunobu T,Kim H.D Korea Society of Computational Fluids Engineering 2005 한국전산유체공학회지 Vol.10 No.1
In order to control the transonic flow field with a shock wave, a condensing flow was produced by an expansion of moist air on a circular bump model and shock waves were occurred in the supersonic parts of the fields. Furthermore, the additional passive technique of shock-boundary layer interaction using the porous wall with a cavity underneath was adopted in this flow field. The effects of these methods on the shock wave characteristics were investigated numerically. The result showed that the flow fields might be effectively controlled by the suitable combination between non-equilibrium condensation and the position of porous wall.
PASSIVE SHOCK CONTROL IN TRANSONIC FLOW FIELD
S. Matsuo,M. Tanaka,T. Setoguchi,H. Kashimura,T. Yasunobu,H. D. Kim 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.1
In order to control the transonic flow field with a shock wave, a condensing flow was produced by an expansion of moist air on a circular bump model and shock waves were occurred in the supersonic parts of the fields. Furthermore, the additional passive technique of shock-boundary layer interaction using the porous wall with a cavity underneath was adopted in this flow field. The effects of these methods on the shock wave characteristics were investigated numerically. The result showed that the flow fields might be effectively controlled by the suitable combination between non-equilibrium condensation and the position of porous wall.
Propagation Characteristics of Compression Waves Reflected from the Open End of a Duct
Heuy Dong Kim,Dong Hoon Lee,H. kashimura 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.5
The present study addresses the distortion of the compression wave reflected from an open end of a shock tube. An experiment is carried out using the simple shock tube with an open end. Computational work is also performed to represent the experimented flows. The second-order Total Variation Diminishing scheme is employed to numerically solve the unsteady, axisymmetric, inviscid, compressible governing equations. Both the experimented and predicted results are in good agreement. The generation and development mechanisms of the compression wave, which is reflected from the open end of the shock tube, are obtained in detail from the present computations. The effect of size of the baffle plate at the open-end that causes the reflection of the incident expansion wave is found negligible. A good correlation is obtained for transition of the reflected compression wave to a shock wave inside the tube. The present data show that for a given wave length of the incident expansion wave the transition of the reflected compression wave to a shock wave can be predicted with good accuracy.
An Assistant System for Riding a Unicycle
M. Iwase,Y. Kanai,M. Kinoshita,S. Hatakeyama,Y. Kashimura,I. Hanazaki,T. Yokoyama,H. Higaki,K. Fujisawa 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.1
The final purpose of this study is to design a control system to assist in the skill of riding a unicycle. To realize such a system, it is necessary to make a mathematical model and to analyze the dynamics of the unicycle. It is ideal that the dynamics of a unicycle is kept as original as possible even if any automatic support control is required to assist the operator. Thus, this paper presents modeling of the unicycle and a control system design by the controlled Lagrangian to realize this type of controller.