4-밸브 가솔린 엔진 펜트루프형 연소실내 텀블 유동 및 난류에 관한 사이클 시뮬 레이션 해석
Cycle simulation analysis for tumble flow and turbulence in a pent-roof combustion chamber of the 4-valve gasoline engines
iii, 40 p.
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The tumble flow in a pent-roof combustion chamber of the 4-valve gasoline engines is modelled to be implemented into the lumped model cycle simulation program. The angular momentum conservation equation for the tumble flow is formed and solved for the cylinder as a control volume, and the resulting tumble velocity profile is incorporated into the k - ε turbulence model. Using the steady flow rig data of flow coefficient and tumble vortex ratio for the intake port as input data, the cycle simulation is performed to show the effect of the intake port angle on the tumble velocity and turbulence intensity. The model well predicts the tumble spin-up, the tumble break-up, and the resulting turbulence increase in the late stage of compression process, frequently observed in the 4-valve gasoline engines. The predictions of tumble flow and turbulence intensity from cycle simulation well agree with the measured data using Laser Doppler Velocimeter in an optical engine.
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