Direct numerical simulation of hydrogen impinging jet flame using flamelet generated manifold reduction

Abstract

A hydrogen-air nonpremixed impinging jet flame is studied using three-dimensional direct numerical simulation (DNS) and flamelet generated manifold (FGM). The simulations are used to investigate the buoyancy instability and the spatial and temporal patterns of the near-wall flame temperature. The computational domain employed has a size of 4 jet diameters in the streamwise direction and 12 jet diameters in the cross-streamwise directions. The results presented in this study were performed using a Cartesian grid with 528x528x528 points. Reynolds number used was Re=2000, based on the inlet reference quantities. The spatial discretisation was carried out using a sixth-order accurate compact finite difference scheme and the discretised equations were advanced using a third-order accurate fully explicit compact-storage Runge-Kutta scheme. Results shows that the combustion-induced buoyancy leads to the formation of both inner and outer vortical structures in the primary and wall jet regions. Moreover, DNS results suggest that the near-wall vortical structures play an important role in the temperature field.

More information

Identifiers

ORCID for K.K.J. Ranga Dinesh: orcid.org/0000-0001-9176-6834

Catalogue record

Export record