Mixing studies of helium in air at Mach 6Concentration and mean flow measurements with nanoshadowgraphs and surface flow visualization have been obtained by a study of mixing phenomena during gas injection into hypersonic flow. At Mach 6, a comparison of the matched-pressure injection case with the underexpanded case indicated a greater injectant core penetration rate and a greater concentration-decay rate, leading to a shorter distance for the injectant core to reach an H2-air stoichiometric ratio. The entire injectant plume remained supersonic, and only moderate pressure losses were found. While injector yaw did not increase the mixing rates, it led to an increase in overall injectant plume cross-section, with consequent increase in the size of the mixing region.
Document ID
19910057116
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Thomas, R. H. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Schetz, J. A. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Fuller, E. J. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Mays, R. B. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)