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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.
A Study on the Flow Characteristics of the Spiral Flow Nozzle with the Width Change of Annular Slit
T. H. Kim,T. Setoguchi,Y. W. Lee 한국가시화정보학회 2009 한국가시화정보학회지 Vol.7 No.1
In comparison with previous researches for swirling flow, the spiral flow self-generated in the spiral flow nozzle has some different characteristics. It is not needed a compulsive tangential momentum to get its velocity component and has long potential core, relatively low swirl ratio, and high focusing ability. In this study, the self-generated mechanism of the spiral flow was clarified and the effect on the width of annular slit on spiral flow characteristics was investigated experimentally and numerically. As a result, the existence of tangential velocity component regardless of a compulsive angular momentum is clarified and the results obtained by experiment have a satisfactory agreement with those by numerical method, quantitatively and qualitatively.
파력발전용 웰즈터빈성능에 영향을 미치는 날개형상에 관한 연구
김태호(T.H. Kim),瀨戶口俊明(T. Setoguchi),김희동(H.D.Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Optimization of the Wells turbine requires a clear understanding of the blade geometry effect on its<br/> performance. The complicated interrelations among the major parameters associated with the turbine<br/> geometry, like solidity, hub-to-tip ratio, aspect ratio, blade sweep ratio, and so on, make the overall<br/> performance of the turbine blade highly difficult and unpredictable. In the present study, the effect of the<br/> blade geometry with the hub-to-tip and aspect ratios on the turbine performance was investigated by a<br/> computational technique. In computation, the 3-dimensional, steady, incompressible, Reynolds-Averaged<br/> Navier-Stokes(RANS) equations were are solved by the finite volume method. It was found that the optimum<br/> blade geometry is obtained for the hub-to-tip ratio of 0.7, the aspect ratio of 0.5, the sweep ratio of 0.35, and<br/> the solidity of 0.67. Detailed flow patterns were obtained to discuss the turbine blade optimization.
A Study on the Flow Characteristics of the Spiral Flow Nozzle with the Width Change of Annular Slit
Kim, T.H.,Setoguchi, T.,Lee, Y.W. The Korean Society of Visualization 2009 한국가시화정보학회지 Vol.7 No.1
In comparison with previous researches fur swirling flow, the spiral flow self-generated in the spiral flow nozzle has some different characteristics. It is not needed a compulsive tangential momentum to get its velocity component and has long potential core, relatively low swirl ratio, and high focusing ability. In this study, the self-generated mechanism of the spiral flow was clarified and the effect on the width of annular slit on spiral flow characteristics was investigated experimentally and numerically. As a result, the existence of tangential velocity component regardless of a compulsive angular momentum is clarified and the results obtained by experiment have a satisfactory agreement with those by numerical method, quantitatively and qualitatively.
김태호(T.H. Kim),瀨戶口俊明(T. Setoguchi),김희동(H.D.Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A Wells turbine for the wave power conversion has generic hysteretic flow characteristics in a<br/> reciprocating flow. The hysteretic loop is opposite to the well-known dynamic stall of an airfoil. In the present<br/> study, the flow mechanism of the hysteretic behaviors was elucidated by the unsteady 3-dimensional Navier-<br/> Stokes computations. It was found that the hysteretic behaviors were caused by the streamwise vortical flows<br/> generated near the blade suction surface. The effects of the hub-to-tip ratio and tip clearance on the hysteretic<br/> flow characteristics of the Wells turbine were also discussed from a view of the practical design of the turbine<br/> blade.
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.