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Dual-Pump CARS Thermometry and Species Concentration Measurements in a Supersonic CombustorThe dual-pump coherent anti-Stokes Raman spectroscopy (CARS) method was used to measure temperature and the absolute mole fractions of N2, O2 and H2 in a supersonic combustor. Experiments were conducted in NASA Langley Research Center's Direct Connect Supersonic Combustion Test Facility. In this facility, hydrogen and air bum to increase the enthalpy of the test gas; O2 is then added to simulate air. This gas is expanded through a Mach 2 nozzle and into a combustor model consisting of a short constant-area section followed by a small rearward facing step and another constant area section. At the end of this straight section H2 fuel is then injected at Mach 2 and at 30 deg. angle with respect to the freestream. One wall of the duct then expands at a 3 deg. angle for over 1 meter. The ensuing combustion is monitored optically through ports in the side of the combustor. CARS measurements were performed at the nozzle exit and at four different planes downstream fuel injection. Maps were obtained of the mean temperature, as well as quantitative N2 and O2 and qualitative H2 mean mole fraction fields. Correlations between fluctuations of the different measured parameters are presented for one of the planes of data.
Document ID
20040035789
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
OByrne, Sean
(New South Wales Univ. Canberra, Australia)
Danehy, Paul M.
(NASA Langley Research Center Hampton, VA, United States)
Cutler, Andrew D.
(George Washington Univ. Hampton, VA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
AIAA Paper 2004-0710
Meeting Information
Meeting: 42nd Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 5, 2004
End Date: January 8, 2004
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
OTHER: 23-762-55-MB
Distribution Limits
Public
Copyright
Public Use Permitted.
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