LES多组分汽液平衡模型及其在ECN喷雾A中的应用
Multi-component vapor-liquid equilibrium model for LES and application to ECN Spray A
摘要：
本文提出并评价了一个详细的多组分两相热力学平衡模型，用于高压下液体燃料喷射和混合的大涡模拟（LES）。该模型能较好地描述超临界和多组分亚临界两相共存状态。大涡模拟结果与实验数据吻合得很好。我们还解决了著名的跨和超临界流体混合的数值挑战，并比较完全保守的制定准保守的制定的控制方程。我们的结果证明了物理和数值的一致性，这两种方法在细网格和典型LES网格上的能量守恒误差与准保守的提法展示。
英文摘要：
We present and evaluate a detailed multi-species two-phase thermodynamic equilibrium model for large-eddy simulations (LES) of liquid-fuel injection and mixing at high pressure. The model can represent the coexistence of supercritical states and multi-component subcritical two-phase states. LES results for the transcritical Spray A of the Engine Combustion Network (ECN) are found to agree very well to available experimental data. We also address well-known numerical challenges of trans- and supercritical fluid mixing and compare a fully conservative formulation to a quasi conservative formulation of the governing equations. Our results prove physical and numerical consistency of both methods on fine grids and demonstrate the effects of energy conservation errors associated with the quasi conservative formulation on typical LES grids.
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