Research on mixing and combustion characteristics of large aspect ratio supersonic combustor equipped with multi-strut

The characteristics of the multi-strut equipped large aspect ratio supersonic combustor fueled with liquid kerosene were observed to deepen understanding of the combustion characteristics. Some numerical simulations and experiments have been carried on at the condition of Tt = 1680K, Pt = 1.68Mpa, and Ma = 2.8. The mixing and combustion performances of liquid kerosene under the different fuel injection methods are studied by numerical calculation. The results show that with the multi-struts injection method, the fuel distribution can be optimized, and combustion performance is improved by 60%. Then, three different strut arrangement schemes are proposed by designing the relative position between the leading edge shock wave of the ignition strut and the injection strut. The shock field structure and total pressure loss in different cases are discussed, and a low-resistance strut arrangement scheme is obtained. The mixing efficiency of the liquid fuel is discussed, and the effect of the shock wave on the fuel vaporization process is analyzed by using the two-phase flow model. The results show that the process of fragmentation and atomization of the gaseous fuel is promoted by the shock wave, which improves the mixing efficiency. The influence of the arrangement scheme of the multi-struts on the combustion efficiency is analyzed. The degree of flame overlap increases rapidly at a small distance between struts, which makes the combustion efficiency drop by 30%. Finally, combined with the research contents of this paper, a design method of the multi-strut arrangement scheme is proposed, and the feasibility of the design method is verified by experiments. The results of this paper are beneficial for the future performance optimization of multi-strut combustors using liquid kerosene as fuel.