Flame Length Scaling of C2H4-Air Premixed Flames under Acoustic Forcing

Abstract

An experimental study has been carried out to investigate the effects of inlet velocity, equivalence ratio, and acoustic forcing on flame lengths and flame center lengths in a dump combustor. A premixed gas of ethylene and air was supplied to a combustor through an inlet section and an acoustic driver was used to generate acoustic forcing to simulate unstable combustion. By changing these parameters, combustion tests were performed and flame images were taken using an ICCD camera with a bandpass filter corresponding to a CH* chemiluminescence band. Flame lengths/flame center lengths were obtained from the flame images and were analyzed with respect to dimensional parameters. For a more general finding, the flame length and flame center length were normalized by the inlet width. The dimensional parameters were also replaced with nondimensional parameters such as the Reynolds number, Strouhal number, Damköhler number, and normalized inlet velocity fluctuation, since dimensional parameters have a complex influence on these non-dimensional parameters. The normalized flame lengths and flame center lengths could be expressed well as a function of the non-dimensional parameters. It was found that an increase in the Reynolds number and a decrease in the Strouhal number, Damköhler number and normalized inlet velocity fluctuation caused the flame length/flame center length to become greater.

Entropy and flame transfer function analysis of a hydrogen-fueled diffusion flame in a longitudinal combustor

“…Lieuwen [17,18] provided an excellent review on premixed flame-acoustic wave interactions via the investigation of acoustic wave interactions with turbulent, premixed flames. Hwang et al [19] performed experimental measurements on a dump combustor to study axial lengths and center lengths of a premixed ethylene-air flame affected by oncoming inlet velocity, equivalence ratio, and acoustic forcing. Kim et al [20] conducted an experiment on a swirl-stabilized combustor to study combustion instability via examining the recirculation zones and vortex interaction.…”