Combustion characteristics of a dual-mode scramjet injecting liquid kerosene by multiple struts

Abstract

In order to optimize fuel allocation between multiple injection struts in scramjet combustor, experimental investigation has been carried out to study the combustion characteristics of a dual-mode scramjet, in which liquid kerosene was injected from three staggered arranged struts, and the effect of fuel allocation between the three struts on the combustion characteristics has been analyzed. The results show strong influence of the quantity and streamwise position of struts on the wall pressure distribution and both the equivalence ratio limits of inlet unstarting and lean blowout. To obtain a wide stable operation range, just one strut is needed for injecting most of the fuel in the combustors with configuration and size as in this work, and a streamwise position closer to the downstream divergent segment is a better injection location. Lower lean blowout limit can be obtained by injecting the overall much lean fuel from just one strut with a relatively closer distance to the downstream flameholder.