The present study deals with the implication of the novel diamond-shaped dual strut with a backward-facing step on the combustion characteristics of a cavity-based scramjet combustor. The dual strut with diamond shape is considered for the investigation since it triggers the flow separation leading to the disturbances in the flow especially at the top and bottom wall thus serving the flame holding purpose. Firstly, the combustion characteristics of a combustor with a single strut are compared and evaluated with a dual strut based combustor to portray the effect of a dual strut. A separate study is carried out to investigate the influence of spacing in a dual strut on the performance of the scramjet combustor. Our study reveals that the dual strut with a cavity greatly affects the formation of vortices, separation region, and recirculation region which is evident from an increase in the mixing and combustion efficiency. It can be observed that the formation of vorticity and the recirculation region is found to be larger due to the strong and multiple reflections of a shock in the case of the diamond-shaped dual strut with a backward-facing step injection as compared to the single diamond-shaped strut. Further, it is observed that the spacing(D) in the dual strut also affects the mixing and combustion performance. It is found that the value of mixing and combustion efficiency decreases with an increase in spacing independent of Mach number due to the presence of larger separation regions. It can also be observed that the length of the recirculation region occupies entire the cavity making flame stable when the spacing is the least. This is desirable as far as engine performance is concerned.

本研究涉及新型的菱形双重支撑的含义，该反向支撑对基于腔的超燃冲压燃烧器的燃烧特性具有向后的作用。考虑使用菱形双支柱，因为它会触发流动分离，导致流动紊乱，尤其是在顶壁和底壁，从而起到阻火的作用。首先，比较和评估了具有单支杆的燃烧器的燃烧特性，并使用基于双支杆的燃烧器进行了评估，以描绘双支杆的效果。进行了一项单独的研究，以研究双支柱中的间距对超燃冲压燃烧器性能的影响。我们的研究表明，带有空腔的双支柱会极大地影响涡旋的形成，分离区域，从混合和燃烧效率的提高中可以明显看出这一点。可以观察到，在菱形双重支撑的情况下，与向后进行阶梯式注射相比，由于震动的强烈和多重反射，涡流和回流区域的形成更大。菱形支柱。此外，观察到双支柱中的间距（D）也影响混合和燃烧性能。发现由于较大的分离区域的存在，混合和燃烧效率的值随着间距的增加而降低，而与马赫数无关，间距的增加。还可以观察到，当间隔最小时，再循环区域的长度占据整个空腔，从而使火焰稳定。