The unsteady turbulence flow of cold and combustion case in different trapped vortex combustor

The trapped vortex combustor (TVC) is a new design concept in which cavities are designed to trap a vortex flow structure. In order to improve combustion efficiency of trapped vortex combustor, a new structure with guide vane and blunt body is proposed. Numerical simulation of unsteady turbulence flow is carried out, and the flow field of different combustor with blunt body and without blunt body is compared to analyze the effect brought by blunt body. The results show that the setting of blunt body can increase the value and the distribution area of turbulent kinetic energy, and improve the heat and mass transfer of the combustion chamber. Double vortex structure, no matter size or location, basically remains unchanged since it is formed, setting blunt body will not affect the cavity flow. Furthermore, after setting blunt body, the combustion chamber exit temperature distribution is more uniform, combustion efficiency is higher. Effect of the blunt body and combustion on unsteady flow (Instantaneous velocity field) in TVC is compared. [Display omitted] •A new structure of TVC with flow guide vane and blunt body was proposed.•The effect of blunt body on the flow combustion characters was investigated.•The flow field of combustor with blunt body and without blunt body is compared.•Vortex undergoes the process of forming-breaking down-forming again-being stable.