Evaluation of Large-Eddy Simulation Coupled with an Homogeneous Equilibrium Model for the Prediction of Coaxial Cryogenic Flames under Subcritical Conditions

Large Eddy Simulations of liquid O2/gaseous H2 coaxial flames at subcritical pressure conditions are reported in this paper. These simulations reproduce the experimental Mascotte cases A1, A10 and A30, operating 1, 10 30 bar, respectively, for which temperature measurements visualisations available. The main objective work is to assess accuracy multi-fluid Homogeneous Equilibrium Model (HEM) described Pelletier et al. (Computers & Fluids, 2020) rocket engine applications. Of particular interest comparison with from Grisch (Aerospace science technology, 2003). To that purpose, numerical conducted care, order ensure a proper statistical convergence estimate influence grid resolution each case. Despite crude assumptions—no surface tension no atomisation model, instance—that made HEM used work, results found be reasonable agreements case A10, even coarser grid. For fine mesh required capture low intensity recirculation zone downstream inner jet necessary shape profile. Finally, A1 simulations, lowest Weber number, show large departures measurements. This expected due deficiency model properly two-phase dispersed flow.