On two-dimensional numerical modeling of the Burrows - Kurkov experimental data on hydrogen combustion in a supersonic air flow usingNS/RANS equations

Abstract

Using the two-dimensional computer code NERAT-2D, a computational analysis of experimental data on the ignition of a hydrogen jet in a concurrent flow of moist air has been performed. For a numerical study, experimental data were selected [Burrows M.C., Kurkov A.P.] An analytical and experimental study of supersonic combustion of hydrogen in the vitiated air stream. AIAA J. 1973. No.11. Pp. 1217–1218], which have been used for several decades to validate computer codes and physicochemical models of hydrogen combustion in air. Used computer code NERAT-2D implements the numerical integration of two-dimensional Na-vier − Stokes equations on structured multi-block grids. The problem is solved on a sequence of calculation grids without and using Reynolds averaging. The 8-reaction kinetic Evans − Schexnayder model of combustion of molecular hydrogen in hot humid air was used. It is shown that on relatively coarse computational grids, the calculated limit of ignition of a hydrogen jet in an airflow significantly exceeds that measured in the experiment. On detailed computational grids, an unsteady motion of an ignitable hydrogen jet is observed, and the ignition boundary corresponds with good accuracy to the experimental one. As an appendix to the article, a number of animation files are presented that illustrate the unsteady combustion of a hydrogen jet in a co-currents flow of moist air.