Abstract
Numerical simulations were carried out for a piloted turbulent non-premixed methane/air flame. The solution method was based on a joint probability density function (PDF) for velocities, chemical composition, and turbulent frequency. A stand-alone Monte Carlo particle-mesh approach was applied to solve the modeled PDF transport equation. The pressure field could be obtained by the solution of a Poisson equation, and thus, the solution procedure did not need the aid of a CFD code. To take into account multistep finite-rate chemistry, the method of intrinsic low-dimensional manifolds (ILDM) was applied in a three-scalar formulation. All chemical information was stored in look-up tables, which could be efficiently implemented into the PDF scheme. The effects of chemical kinetics and mixing processes, which were modeled using the modified coalescence/dispersion model, are analyzed and discussed. The profile of axial mean velocity component and scatter plots of temperature and some intermediate species against mixture fraction are compared to experimental measurements. The overall agreement of the numerical results is good. The local flame characteristics are discussed in the critical state of burning, extinction, and reignition, where finite-rate chemistry becomes significant. These phenomena can also be predicted quite well by these simulations.
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