Multi-component vapor-liquid equilibrium model for LES of high-pressure fuel injection and application to ECN Spray A

作者：Matheis Jan^*; Hickel Stefan

来源：International Journal of Multiphase Flow, 2018, 99: 294-311.

DOI：10.1016/j.ijmultiphaseflow.2017.11.001

• Diesel fuel injection
• Engine Combustion Network (ECN) Spray A
• Large Eddy Simulation (LES)
• Vapor-liquid equilibrium (VLE)
• Supercritical
• Transcritical

We present and evaluate a two-phase model for Eulerian large-eddy simulations (LES) of liquid-fuel injection and mixing at high pressure. The model is based on cubic equations of state and vapor-liquid equilibrium calculations and can represent the coexistence of supercritical states and multi-component sub critical two-phase states via a homogeneous mixture approach. Well-resolved LES results for the Spray A benchmark case of the Engine Combustion Network (ECN) and three additional operating conditions are found to agree very well with 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.

• 出版日期2018-2