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자유회전 테일핀을 갖는 미사일에 대한 Roll Lock-in 현상의 수치적 연구
양영록(Y.R. Yang),김문석(M.S. Kim),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.4
In this study, roll lock-in phenomena of freely spinning tailfins were investigated by a CFD code. To analyze a motion of freely spinning tailfins, this research use a Chimera method, an Euler code and a 6 degrees of freedom analysis. The numerical results of aerodynamic characteristics and roll rates of a canard-controlled missile with freely spinning tailfins show a good agreement with wind tunnel test results. Using the roll rates calculation result of freely spinning tailfins, roll lock-in phenomena is confirmed. Roll lock-in phenomena and Roll lock-in states can be predicted through effects of the induced vortex of the canards control and the analysis of the rolling moments of tailfins due to the bank angle.
충격파를 이용한 발사관 덮개 개방 메커니즘에 관한 수치적 연구
양영록(Y.R. Yang) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.3
A study was conducted on opening mechanism of canister end covers using shock wave from a rocket motor. To create the required pressure to open the end covers, a rupture disk was placed on a nozzle of the rocket motor. As a result of the study, it was confirmed that shock wave pressure generated by the rocket motor and opening time of the aft end cover had a major effect to open the fwd end cover. Through the computational fluid dynamic analysis and test, the opening mechanism of canister end covers by using shock wave from a rocket motor was verified.
A NUMERICAL SIMULATION OF INFRARED RADIATION OF EXHAUST PLUME
장우(Y. Zhang),양영록(Y.R. Yang),박경린(G.R. Park),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
The infrared radiation of exhaust plume was investigated numerically by a finite volume method (FVM) with anisotropic scattering particles. The exhaust plume is considered to absorb, emit and scatter radiant energy isotropically as well as anisotropically. The spatial and spectral distribution characteristics were obtained for the detection wavelength with 2.7㎛. The radiative intensities were presented for the different detective direction.
강영진(Y.J. Kang),양영록(Y.R. Yang),김성현(S.H. Kim),황의창(U.C. Hwang),염용일(Y.I. Youm),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
In this study the performance of the nozzle of a rocket system is evaluated using a CFD code. The main emphasis of the investigation is placed on the effects of the number (9 and 12) and the depth of fluted edge in the rocket nozzle. It is observed that as the depth increases the rolling moment of the nozzle increases while the thrust of the nozzle decreases.
강영진(Y.J. Kang),양영록(Y.R. Yang),황의창(U.C. Hwang),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.3
As a preliminary design study to achieve target aerodynamic performance, this work was conducted on an original nozzle with 9 flutes in order to design a fluted nozzle with 12 flutes. The thrust and rolling moment of the nozzle with 12 flutes were analyzed using a CFD code according to the depth and rotation angle of the flutes. Based on this, a fluted nozzle with 12 flutes was optimized to yield the same thrust as that of the original nozzle with 9 flutes. The response surface method was applied for shape optimization of the fluted nozzle and design variables were selected to determine the depth angle and rotation angle of the flutes. An optimized shape that led to a thrust as strong as that of the original nozzle was obtained
박경린(G.R. Park),양영록(Y.R. Yang),정성기(S.K. Jung),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
An integrated multi-disciplinary design system plays a critical role in the preliminary design of an aircraft. In this paper such system is developed for the multi-disciplinary computation and design; aerodynamics, elasticity, and radio frequency stealth. Common data base of geometry and structured grids is generated and used for aerodynamic, structural and electromagnetics analysis. The Navieri-Stokes CFD, FEM, and CEM technique are used for aerodynamic, structural, and RF stealth computations, respectively.
Radial Basis Function을 사용한 격자 변형에 대한 연구
제소영(S.Y. Je),정성기(S.K. Jung),양영록(Y.R. Yang),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
A moving mesh system is one of the critical parts in a computational fluid dynamics analysis. In this study, the RBF(Radial Basis Function) which shows better performance than hybrid meshes was developed to obtain the deformed grid. The RBF method can handle large mesh deformations caused by translations, rotations and deformations, both for 2D and 3D meshes. Another advantage of the method is that it can handle both structured and unstructured grids with ease. The method uses a volume spline technique to compute the deformation of block vertices and block edges, and deformed shape.