Modelling of hydrogen-air supersonic mixing and combustion in near-wall region

摘要

Turbulent mixing, ignition, and flame stabilization in the non-premixed supersonic hydrogen-air flow is numerically modelled in a near-wall region. Mixing algorithm based on the turbulence approach SA-RANS (Reynolds Averaged Navier-Stokes equations closed with Spalart-Allmaras turbulence model) with a diffusion model and a detailed kinetic model for hydrogen-air chemical reactions are employed. The system of governing equations that consists of basic conservation laws and the turbulence model equation is solved in a coupled manner with the LU-SGS-GMRES method. The model is applied to simulate the process of hydrogen injection into a M = 2.44 air flow with their subsequent mixing, ignition, and combustion in the Burrows-Kurkov chamber. The results are compared to available experimental and reference computational data. All calculations are carried out on the 'MVS-10P' JSCC RAS supercomputer cluster.