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김유일(Y.I. Kim),김귀순(K.S. Kim),김경천(K.C. Kim),하만영(M.Y. Ha),박호동(H.D. Park) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
A computer code for solving the Reynolds averaged full Navier-Stokes equations has been developed for analysis of gas and steam turbine cascade flows with the option of using one of two types of turbulence model. One is the Baldwin-Lomax model and the other is standard k-ε model. The numerical integration is based on the explicit four stage Runge-Kutta scheme and finite volume method. To be verified, the resulting code is applied to VKI turbine cascade and compared with the previous experimental results. Finally, the flowfield around a steam turbine cascade is analyzed. Comparisons with experimental data show that present numerical scheme is an accurate Navier-Stokes solver and can give very good predictions for both gas and steam turbine cascade flow.
노규석(K. S. Rho),김유일(Y. I. Kim),구정서(J. S. Koo),송달호(D. H. Song) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
For a good crashworthy design of train vehicles, it is essential to develop some design and analysis techniques for energy absorbing structures. This paper analyzes the front structure of TGV-K and suggests crashworthy design of Korea high speed train(KHST) using the accident scenario of SNCF(collision with a stationary rigid mass in motion of 15 ton at 110 ㎞/h). Specifically this reserch is concentrated on developing a well-designed protective headstocks using mullticell structures with cutouts to improve crashworthiness of KHST.
김명호(M.-H. Kim),최정열(J.-Y. Choi),김귀순(K.S. Kim),이기수(G.S. Lee),김유일(Y.I. Kim),임진식(J.S. Lim) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
An accelerating flow field through a compressor cascade is studied numerically by unsteady computational simulation. The two-dimensional Navier-Stokes equations for compressible flow is used for the study of unsteady high incidence angle flow, with preconditioning scheme to cover the wide range of Mach number and k-ωmodel for the turbulent viscous flow analysis. A DCA(double circular arc) compressor blade is accelerated artificially in this study to understand the unsteady effect by comparing the present results with the existing steady-state experimental and computational results. Also, the accelerating flow field during the starting phase of gas turbine is studied with actual experimental data for the understanding of flow field and performance characteristics at off-design condition.
노규석(K. S. Rho),구정서(J. S. Koo),김유일(Y. I. Kim),송달호(D. H. Song) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Because a driver is located in the front end of KHST, he is most likely to be insured at collision accidents. So, it is very important to design some survival space for the driver. To evaluate the driver"s safety of KHST (Korean High Speed Train), the front structure of power car is analysed using PAMCRASH under the SNCF accident scenario(collision against a movable rigid mass 15 ton at 110 ㎞/h). Because the driver"s cab of KHST is a modified version of TGV-K, which is not so strong as to protect him, it turns out to be inadequate to guarantee his survival space. Therefore it is recommended to redesign the driver"s cab in a crash worthy point of view like the case of TGV-Duplex or NEC.