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Numerical Investigation of In-Cylinder Fuel Atomization and Mixing For a GDI Engine

机译：GDI发动机缸内燃油雾化和混合的数值研究

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Gasoline Direct Injection (GDI) engines have been shown to have better fuel economy, transient response and cold-start hydrocarbon emissions. Additionally they have lower NOx emissions when operated under lean conditions. However, controlling charge stratification under various load conditions is a major challenge in GDI engines. In the present study a numerical simulations have been performed to understand factors affecting air/fuel mixture preparation under various engine operating conditions. Fuel spray atomization was studied using the two-way coupled Eulerian-Lagrangian approach. Momentum, energy and species equations were solved for the continuous gas phase. The droplet life history was tracked using the Lagrangian approach. Parameters like fuel injection time, fuel mass flow rate and engine speed was varied to determine their effect on air/fuel mixture preparation inside the cylinder. NOMENCLATURE A Area (m 2) B Spalding number Cd Coefficient of discharge Cp Constant pressure specific heat (kJ/kgK) do Injector inner diameter (m) Dp Droplet diameter (m) Fs Surface force (N) Fb Body force (N) g Acceleration due to gravity (m/s 2) he Heat transfer coefficient (WK/m 2
机译：汽油直喷（GDI）发动机具有更好的燃油经济性，瞬态响应和冷启动碳氢化合物排放量。此外，在稀薄条件下运行时，它们的NOx排放量更低。但是，在各种负载条件下控制电荷分层是GDI发动机的主要挑战。在本研究中，已经进行了数值模拟，以了解在各种发动机工况下影响空气/燃料混合物制备的因素。使用双向耦合欧拉-拉格朗日方法研究了燃料喷雾雾化。求解了连续气相的动量，能量和物质方程。使用拉格朗日方法跟踪液滴的寿命历史。改变诸如燃料喷射时间，燃料质量流量和发动机速度的参数，以确定它们对气缸内空气/燃料混合物制备的影响。术语A面积（m 2）B喷口数Cd排放系数Cp恒压比热（kJ / kgK）do喷油器内径（m）Dp液滴直径（m）Fs表面力（N）Fb体力（N）g重力加速度（m / s 2）he传热系数（WK / m 2

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