Flame/wall interaction

Sound generation by flame/wall interactions

Modern combustion chambers are compact in order to reduce size and weight restrictions of the system. In some cases, flow perturbations can cause flame annihilation at the vincinity of (film-cooled) walls. The distruction of the flame surface generates pressure waves which may trigger combustion instabilities.

At IMFT, we observed this sound generation mechanism in experimental campaigns. This motivated us to quantify the pressure level of sound which is produced after flame/wall interaction. Here you can take a look at the pressure field during harmonic excitation of the flow filed resulting in a periodic flame/wall interaction.

Consequently, we carried out computations of laminar premixed Head on Quenching (HOQ) and quantified the generated sound level. It turned out, that the pressure fluctuations can be easily modeled analytically, thereby using Cantera for the computation of flow properties.

A. Ghani & T. Poinsot
Flame Quenching at Walls: A Source of Sound Generation
Flow, Turbulence and Combustion (2017), vol. 99 (1), pp. 173-184