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Large-eddy simulations of turbulent flows in internal combustion engines

机译：内燃机湍流的大涡模拟

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摘要

Large-eddy simulations (LES) of turbulent spray combustion in internal combustion engines are conducted with a new hybrid Eulerian-Lagrangian methodology. In this methodology, the Eulerian filtered compressible gas equations are solved in a generalized curvilinear coordinate system with high-order finite difference schemes for the turbulent velocity and pressure. However, turbulent mixing and combustion are simulated with the two-phase compressible scalar filtered mass density function (FMDF) and Lagrangian spray models. The LES/FMDF model is used for simulation of in-cylinder turbulent flow and spray mixing and combustion in three flow configurations: (1) a poppet valve in a sudden expansion, (2) a simple piston-cylinder assembly with a stationary valve, and (3) a realistic single-cylinder, direct-injection spark-ignition (DISI) engine. The flow statistics predicted by the LES model are shown to compare well with the available experimental data for (1) and (2). The computed in-cylinder flow for the third configuration shows significant cycle-to-cycle variations. The flow in the DISI engine is also highly inho-mogeneous and turbulent during the intake stroke, but becomes much more homogeneous and less turbulent in the compression stroke. Simulations of spray, mixing and combustion in the DISI engine indicate the applicability of the LES/FMDF model to internal combustion engines and other complex combustion systems.
机译：使用新的混合欧拉-拉格朗日方法对内燃机中的湍流喷雾燃烧进行大涡模拟（LES）。在这种方法中，欧拉滤波的可压缩气体方程是在广义曲线坐标系中求解的，该方程组具有针对湍流速度和压力的高阶有限差分方案。但是，利用两相可压缩标量滤波质量密度函数（FMDF）和拉格朗日喷雾模型模拟了湍流混合和燃烧。 LES / FMDF模型用于模拟三种流动配置下的缸内湍流以及喷雾混合和燃烧：（1）突然膨胀的提升阀；（2）具有固定阀的简单活塞缸组件； （3）现实的单缸直喷式火花点火（DISI）发动机。 LES模型预测的流量统计数据显示与（1）和（2）的可用实验数据进行了很好的比较。对于第三种配置，计算出的缸内流量显示出明显的周期变化。在进气冲程期间，DISI发动机中的气流也很不均匀，且湍流很大，但在压缩冲程中，气流变得更加均匀，湍流更少。 DISI发动机中喷雾，混合和燃烧的模拟表明LES / FMDF模型在内燃机和其他复杂燃烧系统中的适用性。

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