Numerical Simulation Of Combustion Performances Of The Tarpped Vortex Combustor

When fluid flows through a cavity, the cavity will have one or some trapped vortexs, combustion performances what fuel burns in the trapped vortex have high combustion efficiency and low lean-fuel blow-out ratio. Blowing air from cavity walls can strengthen the vortex intensity. Recent research shows that if fuel is injected from the bottom of fore-wall and air is blown from the middle of the after-wall, it will produce two vortices in the cavity. One vortice near the mainstream serves to the main combustion, the other serves to stable ignition. This two vortices lead to make the tarpped vortex combustion better. Based on the above principle in the trapped vortex combustor, this kind of trapped vortice combustor has advantage of high-efficient and compact structure.In this paper through the CFD calculation of the combustor, ways of combustion organizations and some key technology of performance are analysed. A kind of new technology of flame stability is used through the fuel supply classification, subarea combustion technology to meet more and more widen operating range. The main flame is ignited by flame on duty from the trapped vortex, which achieves high-efficiency and low emission. Trapped vortex combustion can be designed as RQL (Rich-Quench-Lean) high-performance and low-pollution combustor through changing the fuel distribution. By calculating, allotting fuel with optimal outlet profile and low emisssion are obtained, while other three working parameters are computed, which is compared with the prototype. It is concluded that the tarpped vortex combustor has compact structure, better outlet temperture profile and lower emission.