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1차원 재생모델에 의한 벽-유동 모노리스 디젤 입자상물질 필터 트랩의 수치 시뮬레이션
김광현(G.H.Kim),박정규(J.K.Park),정인승(Y.S.Jung) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
A mathematical model for wall-flow monolith ceramic diesel paniculate filter was developed in Oder to decnbe the processes which take place in the filter during regeneration. The major output of the model comprises ceramic wall temperature and regeneration time (soot reduction). Various numerical tests were performed to demonstrate how the gas oxygen concentration, flow rate and the initial paniculate trap loading affect the regeneration time and peak trap temperatures. The model is shown to be in reasonable agreement with the published experimental results. This model can be applied to predict the thermal shock failure due to high temperature during combustion regeneration process.<br/>
SI 엔진의 헤드와 블록에 대한 온도 분포 해석 및 측정
김광현(G.H.Kim),박정규(J.K.Park),권남진(N.J.Kwon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
This is a study for the prediction of engine temperature distribution using the finite element method. And then results of this simulation will be verified by experimental results. High power and high efficiency is required in internal combustion engine. And high power increases pressure and temperature in combustion chamber. Therefore. engine block and cylinder head must have high reliability from thermal stress more than before. Hence, it is necessary to evaluate heat transfer and thermal behavior of engine. The difficult problem of 3-dimensional temperature distribution analysis is to determine boundary condition for solving Laplace equation. In this study, for the calculation of temperature distribution of engine, the cycle simulation in combustion chamber which is used to find heat transfer coefficient and ambient temperature is necessary. The temperature distribution of each part of engine can be obtained by using the heat transfer coefficient and ambient temperature as boundary condition. The purpose of this study is to analyze, by the finite element method, 3-dimensional temperature distribution of engine head and block.<br/>
G. Kim(김광현),Y. Choe(최요한),C. Kim(김종암) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.1
The present paper deals with accuracy improvement of a bleed boundary condition model used to improve the performance of supersonic inlets. In order to accurately predict the amount of bleed mass flow rates, this study performs a scaling of sonic flow coefficient data for 90-degree bleed holes in consideration of Prandtl-Meyer expansion theory. Furthermore, it is assumed that porosity varies with stream-wise location of the porous bleed plate to accurately predict downstream boundary layer profiles. The bleed boundary condition model is demonstrated through Computational Fluid Dynamics(CFD) simulations of bleed flows on a flat plate with/without an oblique shock. As a result, the bleed model shows the improved accuracy of bleed mass rates and downstream boundary layer profiles.