This paper conducts a numerical study on the characteristics of mean flow field of a combustor with triple swirlers with focus on the effect of turbulence models on the central recirculation zone (CRZ). By comparing numerical results with high-speed photography experiment, it is found that k-Îµ RNG model can better predict the flow field characteristics than k-Îµ realizable and k- Ï‰ SST model. the CRZ length and expansion angle obtained by k-Îµ RNG model are consistent with experiments, and k-Îµ Realizable model are relatively close to it, while k-Ï‰ SST model is quite different from the two others. The results predicted by k-Ï‰ SST have much higher backflow strength and pressure gradient. The study is of great significance to reasonably choice turbulent mode to predict swirling flow in a combustor.
Keywords triple swirler; recirculation zone; turbulence model; Reynolds averaged Navierâ€“Stokes