Flame Front Structure of Ammonia/air Turbulent Premixed Flames Stabilized in Swirling Flows

Abstract

Ammonia is expected not only as hydrogen energy carrier but also as carbon-free fuel. Fundamental flame characteristics of ammonia/air turbulent premixed flames in a swirl burner need to be clarified in order to realize ammonia-fueled gas turbine combustor with high efficiency, and lower emission level than the emission standards. In this study, flame front of ammonia/air flame in swirling flows were experimentally observed by using OH-PLIF under various pressure, and the flame front characteristics, i.e., local flame surface density and local curvature, were evaluated. It was clarified that the scale of wrinkles on flame front decreases with an increase in pressure.