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首页> 外文会议>ASME Internal Combustion Engine Division fall technical conference 2010 >VALIDATION OF A LAGRANGIAN IGNITION MODEL IN SI ENGINE SIMULATIONS
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VALIDATION OF A LAGRANGIAN IGNITION MODEL IN SI ENGINE SIMULATIONS

机译：SI引擎仿真中拉格朗日点火模型的验证

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Ignition process plays a key role in flame kernel formation and heavily affects further combustion development. The paper aim is to present a ID lagrangian ignition model and to validate it against real engine configurations.A lump model for the electrical circuit of the spark plug is used to compute breakdown and glow energy. At the end of shock wave and very first plasma expansion, a spherical kernel is deposited inside the gas flow at spark plug location. A simple model allows computing initial flame kernel radius and temperature based on physical mixture properties and spark plug characteristics. The sphere surface of the kernel is discretized by triangular elements which move radially according to a lagrangian approach. Expansion velocity is computed accounting for both heat conduction effect at the highest temperatures and thermodynamic energy balance at relatively lower temperatures. Turbulence effects and thermodynamic properties of the air-fuel mixture are accounted for.Restrikes are possible depending on gas flow velocity and mixture quality at spark location. CFD solver and lD/lagrangian ignition model are closely coupled at each time step. The model proves to strongly reduce the grid sensitivity.The CFD model validation phase is crucial for a correct representation of both kernel formation and combustion development: the operation has been carried out by means of anaccurate statistical analysis of experimental in-cylinder pressure data in real engine configurations.
机译：点火过程在形成火焰核中起关键作用，并严重影响进一步燃烧的发展。本文的目的是提出一个ID拉格朗日点火模型并针对实际发动机配置对其进行验证。火花塞电路的总模型用于计算故障和辉光能量。在冲击波结束且等离子体刚开始膨胀时，球形核沉积在火花塞位置的气流内部。一个简单的模型可以根据物理混合物特性和火花塞特性计算初始火焰核半径和温度。内核的球面由根据拉格朗日方法径向移动的三角形元素离散化。计算膨胀速度时要考虑到最高温度下的热传导效应和相对较低温度下的热力学能量平衡。考虑了空气-燃料混合物的湍流效应和热力学性质。根据气体流速和火花位置处的混合物质量，可能会发生重击。 CFD求解器和ID /拉格朗日点火模型在每个时间步都紧密耦合。该模型证明大大降低了栅格灵敏度.CFD模型验证阶段对于正确表示核形成和燃烧发展至关重要：通过实际的缸内压力数据的准确统计分析来进行操作引擎配置。

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