Effect of equivalence ratio of wall injection on strut-cavity coupled combustion

For the combustor based on full-height swept strut coupled with cavity, the experiments were conducted under clean air conditions and the inlet air was preheated by storage heater. Liquid kerosene was used as fuel and was injected by stages from the wall and strut. The effect of equivalence ratio of wall injection on the static pressure distribution and combustion performance was studied by experiments and one-dimensional analysis. The results show that as the equivalence ratio of strut was constant, with the increasing of wall injection equivalence ratio, the peak static pressure increased, and the position of the lifting of pressure was moved upward. When the total equivalence ratio reached 1.1, an inlet unstart occurred. One-dimensional analysis shows that the Mach number decreased below 1 in the strut area, then reached 0.5 in cavity and finally back to more than 1 in diverging area of outlet. The combustor worked in subsonic mode. In the combustion performance aspect, increasing of wall injection equivalence ratio ledes to increase of total pressure recovery coefficient, increase of total temperature at exit, but reduction of combustion efficiency.