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정석영,윤성준,변우식,안창수,Jung Suk Young,Yoon Sung Joon,Byon Woosik,Ahn Chang Soo 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.3
Numerical analysis of aerodynamic heating for KPSAM is performed using aerodynamic heating model suitable to KPSAM, which has complex flow field resulting from the spike attached to the dome, such as large separation area and the strong shock/boundary layer interaction region around reattachment point on the dome. The aerodynamic heating model is validated and modified through the comparison between the flight test measurement and the thermal analysis results. TFD temperature sensors are installed on the dome to measure surface temperature during the flight. Computation results, obtained from the heat transfer analysis on the sensors, agree well with flight test data. The aerodynamic heating model provides heat transfer rate into surface as a boundary condition of unsteady 1D/axisymmetric thermal analysis on the missile structure. The axisymmetric thermal analysis using FLUENT is more versatile than the 1D analysis and can be applied to the heating problem related with complex structures and multi-dimensional heat transfer problems such as prediction of temperature rise at contact surface of different materials.
허기훈(Ki-Hoon Hur),변우식(Woosik Byon) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
Parametric studies are performed of the factors influencing the afterbody drag. To display the effect of differing afterbody shapes, several ogive boattails with combinations of the base area and the angle of boattail end are computed using axisymmetric Navier-Stokes equations with central differencing and a DADI scheme. And Chien's k-e model is employed used for computations of turbulent flows around the base region. The effects of base area, hoattail angle and jet on/off are illustrated on afterbody drag at transonic speed.
정석영(Suk Young Jung),윤성준(Sung Joan Yoon),변우식(Woosik Byon) 한국전산유체공학회 2002 한국전산유체공학회 학술대회논문집 Vol.2002 No.-
Numerical analysis of aerodynamic heating for KPSAM is performed using aerodynamic heating model suitable to KPSAM, which has complex flow field resulting from the spike attached to the dome, such as large separation area and the strong shock/boundary layer interaction region around reattachment point on the dome. The aerodynamic heating model is validated and modified through the comparison between the flight test measurement and the thermal analysis results. TFD temperature sensors are installed on the dome to measure surface temperature during the flight. Computation results, obtained from the heat transfer analysis on the sensors, agree well with flight test data. The aerodynamic heating model provides heat transfer rate into surface as a boundary condition of unsteady ID/axisymmetric thermal analysis on the missile structure. The axisymmetric thermal analysis using FLUENT is more versatile than the ID analysis and can be applied to the heating problem related with complex structures and multi -dimensional heat transfer problems such as prediction of temperature rise at contact surface of different materials.
비정렬 중첩격자기법을 이용한 유도무기의 기체분리운동 모사
정문승(Mun Seung Jung),이상욱(Sang Wook Lee),권오준(Oh Joon Kwon),허기훈(Ki Hoon Hur),변우식(Woosik Byon) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.5
본 연구에서는 비행중인 유도무기의 기체분리에 대한 수치적 해석을 수행하였다. 기체 의 정확한 분리운동을 모사하기 위해 삼차원 공간에서 각각의 물체가 연결되어 움직이는 6자유도 운동방정식을 유도하였으며/ 물체를 둘러싼 격자계의 독립적인 처리를 위해 개발 된 비정렬 중첩격자기법과 연계하였다. 개발된 해석기법은 유도무기의 받음각이 0도와 5 도인 경우의 기체분리운동 해석에 적용되었으며/ 이를 통해 본 연구에서의 해석기법이 다 중 물체간의 상대운동이 있는 비정상 유동장을 해석하는데 효과적임을 알 수 있었다. In this study, numerical simulation of airframes separating from a missile system has been preformed. For the time-accurate trajectory simulation, six D.O.F equations of motion of multiply connected bodies were derived and these equations have been coupled with the unstructured overset mesh technique for the treatment of independent mesh blocks moving with each body component. Applications were made for the simulation of the airframe separation at missile angles of attack of 0 and 5 degrees. It was demonstrated that the present method is efficient and robust for the prediction of unsteady time-accurate flow fields involving multiple bodies in relative motion.