Analysis of Flame Onset and Propagation for the Flame Speed Closure Turbulent Combustion Model in Constant-Volume Vessels,

ARANCIAGA JOAQUIM; LOPEZ EZEQUIEL; NIGRO NORBERTO

Bahia Blanca

Congreso; MECOM 2022; 2022

AMCA

Computational simulations of the kernel growth resulting from a spark discharge in fuel-air mixtures have been carried out in many works to date by different groups, under both laminar andturbulent conditions. Within the Reynolds-Averaged Navier-Stokes (RANS) context, most turbulentcombustion models in current and widespread use lack thorough testing and validation in a seeminglysimple, though extremely valuable setup. Namely, a fan-stirred vessel with well-defined turbulencestatistics, in which a spherical flame grows as it burns fresh mixture after a spark is discharged. Anotable exception is the Flame Speed Closure (FSC) Model, which has been extensively employed topredict explosions under a wide range of conditions. The main focus of the present work is to examinea weak point associated to the model through the application of Computational Fluid Dynamics (CFD)for simulating turbulent combustion in constant-volume vessels, specifically the difficulty in producingsuccessful ignitions using standard ignition models. A modification to circumvent the referred issue isproposed and assessed.