Effect of Bluff-Body Shape on Stability of Hydrogen-Air Flame in Narrow Channel

Abstract

In this work, we study the effect of bluff body shape on the proprieties of Hydrogen-air flame propagating in a narrow channel, specially its stabilization. The study is conducted with a 3D CFD numerical simulation with detailed reactional mechanism. In this work, the Finite Volume Method is applied. In other hand, the k-e turbulence model was adopted and no artificial flame anchoring boundary conditions was used. The results show dependence between flame structure and bluff body shape. This impact is particularly clear on its thermal properties. Indeed, it appears that the flame has a stretched appearance. This stretch increases particularly at the flame front. However, the heat losses determine the flame anchoring location. In other hand, results analyze shows a dependence between flame location and vortices dilatation of the turbulent flow in the narrow channel with bluff-bodies. The stability of the flame is increased when a triangular or semicircular bluff-body is applied.