The two-point spatial correlation of the rate of change of fluctuating heat release rate is central to the sound emission from open turbulent flames, and a few attempts have been made to address this correlation in recent studies. In this paper, the two-point correlation and its role in combustion noise are studied by analysing direct numerical simulation (DNS) data of statistically multi-dimen...

Direct numerical simulation data obtained from four pairs of turbulent, lean hydrogen–air, complex-chemistry flames are analysed to explore the influence molecular diffusion on flame surface density, displacement speed $S_d$ and density transport equation terms. Each pair involves (i) a where mixture-averaged diffusivities adopted Lewis number $Le$ is significantly less than unity (ii) an equid...

Direct Numerical Simulations (DNS) are performed to investigate the process of spontaneous ignition hydrogen flames at laminar, turbulent, adiabatic and non-adiabatic conditions. Mixtures vitiated air temperatures representing gas-turbine reheat combustion considered. Adiabatic processes investigated first, providing a quantitative characterization stable unstable flames. Results indicate that,...

Planar laser-induced incandescence (LII) imaging is reported at repetition rates up to 100 kHz using a burst-mode laser system to enable studies of soot formation dynamics in highly turbulent flames. To quantify the accuracy and uncertainty of relative soot volume fraction measurements, the temporal evolution of the LII field in laminar and turbulent flames is examined at various laser operatin...