The ignition process of a premixed reactive jet in hot vitiated crossflow

Abstract

The transient ignition process of a premixed methane-air jet that is injected into a hot vitiated cross-flow is investigated by means of LES with analytically reduced chemistry. Premixed reactive jet in hot crossflow (RJICF) configurations are important for modern combustion systems for power applications. The ignition process occurs without external heat source and it is here investigated by comparing numerical simulations to experimental data (PIV and OH LIF). The LES gives access to the full spatio-temporal evolution of the reaction zone, and allows to identify regions governed by autoignition and by flame propagation. After the transient flame anchoring, the turbulent RJICF structure is also characterised. The reaction zone stretches over a wide range of mixture fractions from the most reactive one to the stoichiometry.