Numerical Simulation of an Ultra-compact Interstage Turbine Burner with Increasing Number of Cavities in the Cavity

Abstract

Abstract. The Interstage Turbine Burner (ITB) engine provide significantly higher specific thrust with no or only small increases in thrust specific fuel consumption substitute for conventional gas engine with after-burners. Continue combustion between a high pressure turbine stage and low pressure turbine stage is organized. Ultra-Compact Combustor (UCC), which is one of mainstream design concepts of ITB, has a broad application prospect in the field of aviation with the advantages of compact structure and high combustion efficiency. In order to improve the application of Ultra-Compact Turbine interstage combustor in aero-engine, the numerical simulation was carried out by using CFD technique to research on the influence of the number of cavities in the cavity on the ITB. The results show that the increasing number of structures of cavities in the cavity will enhance the circumferential cavity of the fuel and air mixing and burning, promote the combustion mixture to the mainstream radial transport capacity and improve combustion efficiency and uniformity of exit temperature field.

A review of computational studies on trapped vortex combustors for gas turbine applications

“…The geometry of the work by Kumar and Mishra (2016) has two cavities, namely, inner and outer located along the walls of the annular combustor. The combustor design of Guang-qi LUO (2017) is similar to that of Thornburg et al (2007) which are designed as an UCC (shorter length). The various geometries of TVC used in numerical studies are illustrated in Figure 1.…”

“…The strengths of simulations in near wall region as predicted by k-omega models and in the far field region as predicted by k-ε model have improved in the past decades and as a result they offer accurate formulations both in reactive and non-reactive cases (Khalil et al , 2018). Grid generation is also heavily influenced by computational advancements as can be seen in the works of Luo et al , 2017 wherein grids with 1– 1.5 million cells were discretized for the simulations. This is a huge shift in TVC simulation studies where in the initial days, grid elements were limited to few lakhs, especially for reactive cases.…”

“…For the reactive cases, two-step chemistry with dddy dissipation concept (EDC) model was used. In case of ITB (Thornburg et al, 2007, Luo et al, 2017, numerical simulations based on Reactive Slot in the middle of aftbody and its effect on length of back flow and total pressure loss implicit formulations with Green Gauss node-based gradient evaluations was used to study the influence of number of structures in cavities of ITB on mixing and transport capacity (Luo et al, 2017). From the study, it was observed that the increasing number of structures of cavities in the cavity help in enhancing the circumferential cavity of the fuel and air mixing and burning, promote the combustion mixture to the mainstream radial transport capacity and improve combustion efficiency and uniformity of exit temperature field.…”