High pressure/high temperature multiphase simulations of dodecane injection to nitrogen: Application on ECN Spray-A

FUEL

卷:275

Article

Koukouvinis, Phoevos^1,2  Vidal-Roncero, Alvaro¹  Rodriguez, Carlos¹  Gavaises, Manolis¹  Pickett, Lyle² 

[1] City Univ London, Sch Math Comp Sci & Engn, Dept Mech Engn & Aeronaut, Northampton Sq, London EC1V 0HB, England

[2] Sandia Natl Labs, Combust Res Facil, 7011 East Ave, Livermore, CA 94550 USA

关键词: Fuel injection;    Real-fluid thermodynamics;    Large Eddy simulation;    Multiphase flows;   

DOI  :  10.1016/j.fuel.2020.117871

来源: Elsevier

【 摘 要 】

The present work investigates the complex phenomena associated with pressure/high temperature dodecane injection for the Engine Combustion Network (ECN) Spray-A case, employing more elaborate thermodynamic closures, to avoid well known deficiencies concerning density and speed of sound prediction using traditional cubic models. A tabulated thermodynamic approach is proposed here, based on log(10)(p)-T tables, providing very high accuracy across a large range of pressures, spanning from 0 to 2500 bar, with only a small number of interpolation points. The tabulation approach is directly extensible to any thermodynamic model, existing or to be developed in the future. Here NIST REFPROP properties are used, combined with PC-SAFT Vapor-Liquid-Equilibrium to identify the liquid in mixtures penetration, hence avoiding the use of an arbitrary threshold for mass fraction. Identified liquid and vapour penetration are compared against experimental data from the ECN database showing a good agreement, within approximately 3-8% for axial penetration of liquid, 2% for vapor axial penetration and within experimental uncertainty for radial distribution of mass fraction. Analysis of the vortex evolution indicates that driving mechanisms behind the jet break-up are vortex tilting/stretching, then baroclinic torque, leading to Rayleigh-Taylor instabilities, closely followed by vortex dilation and finally viscous effects.

【 授权许可】

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