Numerical Simulation and Analysis of Flow Process of Slinger Annular Combustor

For further understanding of slinger annular combustor's combustion process, a homemade calculation program in arbitrary curvilinear coordinates had been developed to simulate the turbulent combustion. Research object's 3D body-fitted grid was generated by a program based on that elliptical grid generation technique was used to generate. Gas phase governing equations were discretized by hybrid difference scheme and solved by using SIMPLE arithmetic. RNG k-ε and Wilcox k-ω were used to consider the effects of different turbulent model on turbulent flow numerical simulation. And near wall flow was dealt by three layer wall function. Simulation results show that fresh air introduced into combustion chamber turns back at diffuser's outlet, and a larger recirculation zone exists in diffuser's underside, which results in larger total pressure drag. In the numerical calculation of the cold state flow field, the obvious backflow region is formed on both sides of the head of the flame tube. Simulation results gained from different turbulence models are in agreement with the experimental data. Among these turbulence models, Wilcox k-ω model is likely to offer better prediction capability for the research of combustion process in slinger annular combustor.