Abstract
The project on multi-ring burner is focused on the effect of the distance between each ring on the combustion performance and flame stabilization mechanism. Both numerical analysis and simple experimental diagnosis have been systematically carried out. The governing equations for the combustor model are solved by a CFD-RC software. Changing the variable in simulation, the results are used to be the design basis in the future. When the distance between each ring of the burner is systematically varied, the reacting flow field and heat transfer alter drastically, and which directly affect the flame structure, flame length and flame temperature. When the burners’ gap decreases, flame temperature rises and flow temperature becomes uniform, but flame length increases. The overall effect is negative to combustion performance. The optimal value of the range between each burner and the re-distribution of the equivalence ratio result in better combustion effect. The best operating range of S/d value was around 2.33 in one-step reaction but around 1.67 in two-step reaction. In the design rule, the best design region of S/d value locates between 2 and 2.5 in the case which equivalence ratio is 1.5.