The Research Of The Hyper-burner Mixing Technology

Mixing at the inlet of the hyper-burner can make the combustion in the hyper-burner moreefficient in all operation mode include turbine mode and ramjet mode and conversion mode whileTurbine-Based Combine Cycle working in the full flight envelope. In this paper, several kinds ofmixers were designed according to the hyper-burner working characteristics. Numerical simulation ofsquare lobed mixer was performed to study flow characteristic downstream the mixer and thehyper-burner combustion characteristic. Experiments on two optimized mixers were done to know thepractical performance of mixers.The influence of square lobed mixer’s radial height, area ratio of peak to valley divergence angleand the exit height of the mixer as well as the shape of the central plug on flow characteristic andcombustion performance of the hyper-burner was numerical studied. The results show that thehyper-burner can get the least total pressure loss and the best mixing performance while the radialheight of the mixer equals the radius of the wall which separates the core and the bypass flow, thepeak area (core flow pass) equals the valley area (bypass flow pass), the down divergence angle islarger than upward angle and the ratio of mixer exit height to mixer wavelength is0.65. Meanwhile,with the length of the central plug increasing and the area between the mixer and central plugdecreases, the turbine downstream backflow can be restrained obviously under ramjet mode and themixing characteristic was enhanced. On the basis of aforementioned analysis, the optimized mixerstructure that can mix core and bypass flow more efficiently in short mixing distance was got.Mixer integrated with fuel injection was designed, and fuel spray distribution downstream themixer with different injection location was simulated. The results show that, in the axial, fuel spraydistributes more uniformly as the injection position close to the mixer exit; in the circumferential, thefuel-rich region in the flow channel decreases and the fuel concentration nearby the radial flamestabilizer increases with the radius of the circumferential injection increasing; in the radial, the fuelconcentration afore annular flame stabilizer decreases with the radial injection radius increasing.A fan-shaped test platform of the hyper-burner was set up under the foundation of the numericalstudy. Experiments of the performance of hyper-burner equipped with square lobed mixer and theintegrated fuel injection mixer were performed, which verified the results of numerical study andestablished good foundation for further research.