Species Measurements in a Hypersonic, N96-11689 Hydrogen-air, Combustion Wake

^ A continuously sampling, time-of-flight mass spectrometer has been used to measure relative species concentrations in a two-dimensional, hydrogen-air combustion wake at mainstream f; Mach numbers exceeding 5. The experiments»which were conducted in a free piston shock ! tunnel, yielded distributions of hydrogen, oxygen, nitrogen, water and nitric oxide at stagnation enthalpies ranging from 5.6 MJ kg" to 12.2 MJ kg" and at a distance of approximately 100 times the thickness of the initial hydrogen jet. The amount of hydrogen that was mixed in stoichoimetric proportions was approximately independent of the stagnation enthalpy, in spite of the fact that the proportion of hydrogen in the wake increased with stagnation enthalpy. Roughly 50% of the mixed hydrogen underwent combustion at the highest enthalpy. The proportion of hydrogen reacting to water could be approximately predicted using reaction rates based on mainstream temperatures. Postgraduate Student f Emeritus Professor of Space Engineering 1 https://ntrs.nasa.gov/search.jsp?R=19960001681 2017-09-13T15:45:59+00:00Z