Laser absorption measurements of OH concentration and temperature in pulsed facilitiesA laser absorption flow diagnostic application has been developed at the NASA Ames 16-inch Shock Tunnel for purposes of measuring the thermochemical state of OH in flow environments of interest. Research objectives include the investigation of high temperature, low pressure chemistry pertinent to scramjet combustors and high altitude flight. The system can be operated in either the fixed frequency mode or in the rapid wavelength scanning mode to measure species mole fraction and temperature. Emission diagnostics have been employed to determine shock tunnel flow quality and assist in the proper application of the diagnostic and its data interpretation. Rotational lines in the OH system were probed in the expanding facility nozzle flow, and time-resolved measurements of temperature and mole fraction are provided.
Document ID
19920041136
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cavolowsky, John A. (NASA Ames Research Center Moffett Field, CA, United States)
Newfield, Mark E. (NASA Ames Research Center Moffett Field, CA, United States)
Loomis, Mark P. (MCAT Institute Moffett Field, CA, United States)