Numerical study of injection strategy based on cavity combustor under oblique shock wave interference

In this study, the effect of jet injection strategy on the mixing performance of ethylene jets is investigated. Numerical simulations are carried out using the SST k-ω turbulence model and steady RANS. Mesh-independence verification is performed using experimental data from the open literature. The mixing performance, penetration depth, and total pressure loss of the ethylene jets with different injection angles and injection numbers are compared and analyzed. The analysis reveals that the interaction between the ethylene jets in the double-hole jet facilitated the mixing process and has a significant mixing effect in the vicinity of the nozzle. The mixing efficiency of the two-hole jet near the injection nozzle is about 43.4% higher than that of the 90° jet. The vertical incidence still dominates in the penetration depth. The ethylene diffusion distribution of the double-hole jet is more uniform, so the penetration depth of the double-hole jet does not increase, but decays more slowly downstream. In addition, the jet injection strategy has almost no effect on the total pressure loss.