Species measurements in a hypersonic, 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 Mach numbers exceeding 5. The experiments, in a free piston shock tunnel, yielded distributions of hydrogen, oxygen, nit...

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Bibliographic Details
Published in:Combustion and flame 1996-09, Vol.106 (4), p.478-486
Main Authors: Skinner, K.A., Stalker, R.J.
Format: Article
Language:English
Subjects:
Applied sciences
Combustion of gaseous fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Hydrogen
Mass spectrometry
Nitrogen
Nitrogen oxides
Oxygen
Q1
Theoretical studies. Data and constants. Metering
Water
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Summary: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 Mach numbers exceeding 5. The experiments, 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 −1 to 12.2 MJ kg −1 and at a distance of approximately 100 times the thickness of the initial hydrogen jet. The amount of hydrogen mixed in stoichiometric proportions was approximately independent of the stagnation enthalpy, despite the fact that the proportion of hydrogen in the wake was 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.
ISSN:0010-2180
1556-2921
DOI:10.1016/0010-2180(96)00018-1