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김종규(J.K. Kim),김승현(S.H. Kim),이연상(Y.S. Lee),허강열(G.Y. Huh) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
There is an increasing need for the ability to predict the turbulent flow, chemical reaction and heat transfer phenomena in furnaces and combustors and their performance as a function of the input and boundary conditions. Although a significant progress has been achieved in predictive modelling techniques, the shortcomings in certain modelling aspects highlight the lack of detailed information on the turbulent-combustion characteristics of the flow and radiation heat transfer. Detailed knowledge of the turbulent flow, flame characteristics and heat flux distributions is required in furnaces and combustors for high combustion efficiency and low pollutant emissions. In this paper, FLUENT 4.0 is applied to numerical analysis of the FHC-Ⅲ type swirl burner in No.2 Hot Mill Works of POSCO. The mixture fraction / PDF(Probability Density Function) approach with K-ε turbulent model is used for simulation of turbulent diffusion flames. The PI-model is applied to radiation heat transfer.
유한 체적법을 이용한 난류 확산 화염에서의 복사 열전달 계산
김승현(S.H. Kim),허강열(K.Y. Huh) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
The effects of radiative heat transfer are investigated in a turbulent combustion flow field with highly non-adiabatic flames.Turbulent combustion is modeled by the k-ε-g model and a one step irreversible reaction scheme for the combustion chemistry. The radiative trasport equation is solved by the finite volume method considering the radiative transfer from CO₂, H₂O and soot only. Gray gas is assumed to calculate the radiative properties of CO₂ and H₂O. A two-equation soot formation model is applied to predict soot volume fraction distribution. All equations are solved in a coupled manner and the numerical results are compared with available experimental data.
POPPET VALVE 형 2행정 엔진의 정상 상태 소기 유동 연구 (Ⅱ) -수치 해석 방법
김종규(J.K.Kim),허강열(K.Y.Huh),정용일(Y.I.Jung) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
A two-stroke engine has several advantages over a four-stroke engine. It is simple in structure, light in weight and smoothly operating, etc. The scavenging flow in the cylinder is one of the most important factors in determining the performance and power of a poppet-valve-type two-stroke engine. In this study, a shrouded valve is tested to improve the scavenging flow pattern. The scavenging flow paterrn and trapping efficiency are investigated by 3-D computational fluid dynamic analysis with respect to the shroud angle, shroud shape, motoring speed and valve lift-Results show that the trapping efficiency is the highest with 120 deg shrouded valve.<br/>
김우태(W.T.Kim),허강열(K.Y.Huh) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
A simple valve treatment technique is developed to simulate multiple moving valves in three?dimensional engine flow. In this technique the convective and diffusive fluxes and the pressure gradient are put equal to zero at valve surfaces. The valve motion is treated quasi-statically. Results show reasonable trends for variation of the velocity field.<br/>
PC-based Engine Controller 를 이용한 연소실 압력 자료 취득 및 해석
임혁(H.Im),허강열(K.Y.Huh) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
A PC-based engine controller is developed to enhance flexibility and convenience of engine test bed experiments. The spark advance and injection duration may be set arbitrarily by a user for each cylinder independently. The PC-based engine controller is applied to a 4-cylinder MPI spark ignition engine for cylinder pressure data acquisition and combustion analysis. Experimental results are compared with the results of the quasidimensional analysis to investigate the predictive capability of quasidimensional simulation. It is shown that the quasidimensional cycle simulation reproduces a qualitatively correct trend for the pressure trace and IMEP with respect to the spark advance, load and A/F ratio.<br/>
이광구(G.G.Lee),허강열(K.Y.Huh) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The PIV system and its image analysis software are developed to measure an instantaneous velocity. field. An artificial image is generated and tested to give a proper autocorrelation im-age. The PIV system is applied to a rectangular duct flow as a basic study and a reasonable two dimensional instantaneous velocity field is obtained.<br/>