Strut/wall combined fuel injection scheme was adopted to improve mixing and
combustion efficiency in a scramjet combustor fueled with liquid kerosene in
the condition of Mach 6. Injectors were placed on the front of the strut and
the side wall of the combustor. A series of numerical simulations and
experiments were carried out to improve the combustor performance under
conditions of different incoming flow velocity, injection methods and fuel
distribution ratios. The value of pressure was obtained by pressure sensor
and the flame images were captured by the high-speed camera in experiment.
By processing and analyzing the basic data, characteristics of fuel mixing
and combustion performance were discussed in this paper. Then, the influence
mechanism of the strut/wall combined injection on the performance of the
combustor was explained based on the performance with influence factors.
Results indicated that the mixing and combustion efficiency was related to
condition, injection method and nozzle arrangement. The strut/wall combined
injection dispersed the heat release, which could reduce the pressure rise
and total temperature. The fuel distribution ratio between the strut
injection and wall injection is also a key factor affecting the performance
of the combustor. These results in this paper are valuable for the
combustion organization in the supersonic combustor and the improvement of
the combustor performance.