Application of Coherent Anti-Stokes Raman Scattering to Combustion Media

A laboratory-based system utilizing the Nd:YAG laser has been developed to investigate the Coherent Anti-Stokes Raman Scattering (CARS) of molecular gases in combustion. Single-shot and simultaneous experimental measurements of species concentration and temperature of combustion media are reported a...

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Bibliographic Details
Main Authors: Goss,Larry P, Switzer,Gary L
Format: Report
Language:English
Subjects:
CARS(Coherent Anti-Stokes Raman Scattering)
COMBUSTION
Combustion and Ignition
COMPUTERIZED SIMULATION
DIAGNOSTIC EQUIPMENT
GASES
LASER BEAMS
LIGHT SCATTERING
MATHEMATICAL PREDICTION
MOLECULES
NEODYMIUM LASERS
PE61102F
PE62203F
RAMAN SPECTROSCOPY
Test Facilities, Equipment and Methods
THEORY
TURBULENCE
WUAFWAL2301S103
WUAFWAL30480566
YAG LASERS
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Summary:A laboratory-based system utilizing the Nd:YAG laser has been developed to investigate the Coherent Anti-Stokes Raman Scattering (CARS) of molecular gases in combustion. Single-shot and simultaneous experimental measurements of species concentration and temperature of combustion media are reported and compared with other optical techniques and theoretical predictions. The adverse effects of beam propagation through turbulence are investigated and discussed. A transportable hardened CARS system, constructed to operate in adverse environments, has been used to conduct a series of investigations in a practical combustion tunnel. Temperature and number-density measurements made as a function of fuel-air flow, position in the combustion tunnel, and fuel variation--including both gaseous and liquid fuels--are reported. (Author)