Strut injection was proposed to replace wall injection in ramjet combustaor

in order to promote the combustion efficiency and avoid the problem of inhomogeneous mixing of fuel and mainstream

which was caused by fuel centralized near the wall with wall injection in ramjet combustor based on cavity flameholder. The distribution of fuel and flow field structure in ramjet combustor based on cavity/strut structure was simulated. The effects of strut on mixing and performance of ramjet combustor were studied. It was found that the strut made homogeneous fuel distribution in the whole flow channel

enhanced the mixing of fuel and air

enhanced the mixing efficiency and combustion efficiency of the combustor exit by 214% and 205% respectively

although it reduced the total pressure recovery coefficient of the combustor exit by 63% compared with that under the wall injection method. The improvement of combustion efficiency made up the additional total pressure loss

and increased the specific impulse of the combustor exit by 396% under the strut injection method. Therefore

it is good for improving the combustor performance when the cavity/strut structure is used in ramjet combustor.