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CFD에 의한 2차원 후향계단에서의 재부착 유동특성에 관한 연구
최영도(Y. D. Choi),이영호(Y. H. Lee) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
The present study is aimed to investigate flow characteristics of Two dimensional backward-facing step by numerical approach. A convection conservative difference scheme based upon SOLA algorithm is used for the solution of the two-dimensional incompressible Navier-Stokes equations to simulate the laminar, transitional and turbulent flow conditions at which the experimental data can be available for the backward-facing step. The twenty kinds of Reynolds number are used for the calculations. In an effort to demonstrate that the reported solutions are dependent on the mesh refinement, computations are performed on seven different meshes of uniformly increasing refinement. Also to investigate the result of inflow dependence, two kinds of the inflow profile are chosen for the laminar flow. As criterion of benchmarking the result of numerical simulation, reattachment length is used for the selected Reynolds numbers.
저주파 유도가열 장치용 싸이리스터 PWM 정류기의 특성분석
윤동철(D.C. Yoon),이경빈(K.B. Lee),최영도(Y.D. Choy),백승택(S.T. Beak),한병문(B.M. Han),소용철(Y.C. Soh) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper proposes a new induction heating system composed of a thynstor PWM rectifier with a resonant commutation circuit. The operation of proposed system as first analyzed by a theoretical approach with equivalent circuits. And its verification was performed by computer simulations with EMTP. The proposed system can provide a solution for the power factor problem of the existing high-power induction heating system, which uses the line-commutated thyristor bridge in rectifier side.