Abstract
The development and use of a tunable diode laser absorption sensor for gas temperature and water concentration in a high enthalpy supersonic flow is presented. This diagnostic enables non-intrusive, in situ measurements in harsh environments produced by propulsion ground test facilities. Water vapor was chosen as the target species to enable calculations of hydrogen-air combustion efficiency and to calibrate steam addition for simulated-vitiated testing. The sensor utilizes robust diode lasers capable of probing the nearinfrared absorption band of water near 1.4 microns. Two lasers are wavelength-multiplexed to enable twoline thermometry and both scanned-wavelength direct absorption and wavelength-modulation spectroscopy with second-harmonic detection (WMS-2f) techniques were used. Results are presented for measurements taken at the combustor entrance and tunnel exit of the University of Virginia’s dual-mode scramjet combustor for steam-injected and hydrogen-air combustion operation modes.
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