Abstract
In this paper, we present numerical simulations of a turbulent non-premixed CH4/H2-air flame based on the solution of the transport equation for the joint velocity and composition probability density function (PDF). A Monte Carlo particle-mesh approach is used to solve the modeled PDF transport equation, in which the mean pressure gradient and turbulent frequency are supplied by a finite-volume mean flow program. The finite-rate chemical kinetics of the CH4/H2-air system is simplified by the method of intrinsic low-dimensional manifolds (ILDM). Simple look-up tables guarantee an easy implementation into the turbulent PDF code. The hybrid solution algorithm is applied to calculate a recently published bluff-body stabilized turbulent non-premixed flame of CH4/H2 by Masri et al. [1]. Two different characteristic flames are presented, where one is close to chemical equilibrium and, for the other, the effects of finite-rate chemistry become significant. The mean temperature distribution and scatter plots for temperature and mass fractions of CO2 and H2O are compared with experimental data. The numerical calculations reproduce the experimentally observed phenomena, such as local extinction, quite well.
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