엔진 흡입˙압축과정의 유동해석을 위한 난류모델의 평가
Assessment of Turbulence Models for Engine Intake and Compression Flow Analysis
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초록
Many turbulence models have been developed in order to analyze the flow characteristics in an engine cylinder. Watkins introduced k-ε turbulence model for in-cylinder flow, and Reynolds modified turbulence dissipation rate by applying rapid transformation theory, Wu suggested k-ε-τ turbulence model in which length scale and time scale are separated to introduce turbulence time scale, and Orszag proposed k-ε RNG model. This study applied the models to in-cylinder flow induced by intake valve and piston moving. All models showed similar flow fields during early stage of intake stroke. At the end of compression stroke, κ-ε Watkins, κ-ε Reynolds and κ-ε RNG predicted well second and third vortex, especially κ-ε RNG produced new forth vortex near central axis at the lower part of cylinder which was not predicted by the other models.
Abstract
Many turbulence models have been developed in order to analyze the flow characteristics in an engine cylinder. Watkins introduced k-ε turbulence model for in-cylinder flow, and Reynolds modified turbulence dissipation rate by applying rapid transformation theory, Wu suggested k-ε-τ turbulence model in which length scale and time scale are separated to introduce turbulence time scale, and Orszag proposed k-ε RNG model. This study applied the models to in-cylinder flow induced by intake valve and piston moving. All models showed similar flow fields during early stage of intake stroke. At the end of compression stroke, κ-ε Watkins, κ-ε Reynolds and κ-ε RNG predicted well second and third vortex, especially κ-ε RNG produced new forth vortex near central axis at the lower part of cylinder which was not predicted by the other models.
참고문헌 (13)
- Watkins, A. P., "Flow and Heat Transfer in Piston", Cylinder Assemblies, University of London, 1977
- Reynolds,W.C., "Modeling of Fluid Motions in Engines - An Introductory Overview", pp.41~65 (1980), Plenum Press
- Wu, C. T., "Simulation and Modelling of Homogeneous Compressed Turbulence", Department of Mechanical Engineering, pp.1~80 (1985)
- Orszag, S, A., "Renormalization Group Modeling and Turbulence Simulations", Int. Conference on Near-Wall Turbulent Flows, pp.1031~1046 (1993)
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- 양희천, "RNG κ-ε 모델의 적용성에 대한 연구", 대한 기계학회 논문집(B), 21(9), pp.1149~1164 (1997)
- 박상규, "RNG κ-ε 모델을 이용한 포트", 밸브계 및 실린더 내의 유동해석, 1998, pp.22(4), 436~444
- Modelling of Turbulence in Internal Combustion Engines, "Morel, T.", ~, pp.820040 (1982)
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- 명현국, "이차적인 변형율 효과를 나타내는 새로운 변수의 제안", 대한기계학회 논문집, 18(1), pp.184~192 (1994)
- Tennekes, H., "A First Course in Turbulence" (1973), The MIT Press
- Calculation and Measurements of the flow in a Motored Model Engine and Implications for Open-Chamber, Direct-Injection Engines, "Ahmadi-Befrui, B.", ~, pp.DE82019033 (1982)
- 강신형, "축대칭 왕복엔진의 흡입 및 압축과정에서 유동 및 열전달의 수치해석", 대한기계학회 논문집, 11(3), pp.395~408 (1987)