Experimental study of vitiation effects on hydrogen/kerosene fueled supersonic combustor

Abstract Direct-connect tests were performed to determine the effects of vitiation on combustion in a supersonic combustor. Major combustion vitiation species (H 2 O and CO 2 ) were added to the airstream. The tests were conducted in a direct-connect combustor with a Mach 2.02 inlet, hydrogen and kerosene were chosen as the test fuel. In the cases fueled with hydrogen, with an equivalence ratio of about 0.25, transition from cavity shear-layer combustion mode to combined shear-layer/recirculation combustion mode was observed in three test conditions, clean air stream, air stream with 4.5% H 2 O and 4.5% H 2 O + 4.5% CO 2 , but not occurred in the case with 4.5% CO 2 . In addition, in cases fueled with kerosene, the equivalence ratios were about 0.53 and 0.73 and tests with two matching types in vitiated air were conducted: A. matching total temperature and total pressure; B. matching static temperature and static pressure. Results show that the pressure profile decreased with the increasing H 2 O and CO 2 contents, but the difference of pressure between the two matching types was not significant because of the small difference of two matching types.