Injection Studies in the French Hypersonic Technology Program

摘要

During the first year of the French hypersonic program PREPHA, various concepts of scramjet injector struts had been studied. Two concepts had been defined to be tested individually at conditions simulating Mach 6. Tests results of these two concepts are presented and compared with three-dimensional calculations. The first concept led to a stable supersonic combustion regime at all equivalence ratios. With the second concept, designed to optimize mixing efficiency, some difficulties were encountered, relative to ignition delay (at low equivalence ratio) and to precombustion shock train occurrence (at high equivalence ratio). In parallel, basic experiments relative to jet penetration and ignition were performed: they provide an extended data base which can be used to support strut injectors design. From all these studies, a strut injector concept has been choosen for the injection system of the PERPHA test scramjet CHAMOIS.