A flamelet model for transcritical LOx/GCH4 flames

[摘要] This work presents a numerical framework to efficiently simulate methane combustion at supercritical pressures. A LES flamelet approach is adapted to account for real-gas thermodynamics effects which are a prominent feature of flames at near-critical injection conditions. The thermodynamics model is based on the Peng-Robinson equation of state (PR-EoS) in conjunction with a novel volume-translation method to correct deficiencies in the transcritical regime. The resulting formulation is more accurate than standard cubic EoSs without deteriorating their good computational performance. To consistently account for pressure and strain fluctuations in the flamelet model, an additional enthalpy equation is solved along with the transport equations for mixture fraction and mixture fraction variance. The method is validated against available experimental data for a laboratory scale LOx/GCH4flame at conditions that resemble those in liquid-propellant rocket engines. The LES result is in good agreement with the measured OH∗ radiation.

[发布机构] Institut für Thermodynamik, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, Neubiberg; 85577, Germany^1

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Computational performance;Injection conditions;Liquid propellant rocket engine;Peng-Robinson equation of state;Real gas thermodynamics;Super-critical pressures;Thermodynamics model;Transcritical regimes