Flame-vortex interaction during turbulent side-wall quenching and its implications for flamelet manifolds

TL;DR

This paper investigates turbulent flame-wall interactions during side-wall quenching of methane-air flames using detailed simulations, revealing insights into flame vortex interactions and proposing a new chemistry manifold that improves prediction accuracy near walls.

Contribution

It introduces a novel chemistry manifold that accounts for exhaust gas recirculation and enthalpy losses, validated through simulation and enhancing modeling accuracy.

Findings

Simulation captures head-on and side-wall quenching behaviors.

The new manifold improves prediction of near-wall thermochemical states.

Flame vortex interaction mechanism aligns with experimental observations.

Abstract

In this study, the thermochemical state during turbulent flame-wall interaction of a stoichiometric methane-air flame is investigated using a fully resolved simulation with detailed chemistry. The turbulent side-wall quenching flame shows both head-on quenching and side-wall quenching-like behavior that significantly affects the CO formation in the near-wall region. The detailed insights from the simulation are used to evaluate a recently proposed flame (tip) vortex interaction mechanism identified from experiments on turbulent side-wall quenching. It describes the entrainment of burnt gases into the fresh gas mixture near the flame's quenching point. The flame behavior and thermochemical states observed in the simulation are similar to the phenomena observed in the experiments. A novel chemistry manifold is presented that accounts for both the effects of flame dilution due to exhaust gas recirculation in the flame vortex interaction area and enthalpy losses to the wall. The manifold is validated in an a-priori analysis using the simulation results as a reference. The incorporation of exhaust gas recirculation effects in the manifold leads to a significantly increased prediction accuracy in the near-wall regions of flame-vortex interactions.