Rayleigh and Raman scattering for density in a swirling flow combustor
Thesis/Dissertation
·
OSTI ID:5621193
Laser scattering measurements of density are conducted in a swirling flow combustor. The combustor uses two swirling concentric jets with the inner jet of air premixed with methane and outer jet comprising only air. A free standing recirculation zone is formed on the axis at the inlet of the combustor due to the vortex breakdown mechanism. Rayleigh scattering is used for time resolved total density measurements and Raman scattering is used for time averaged methane density measurements. A laser beam multipassing technique is employed to enhance the effective beam power to make Raman scattering measurements possible. Spatial resolution, unaffected by multipassing, is in the form of a cylinder 1 mm in length and 0.1 mm in diameter. A time resolution of 200 micro-seconds is used for the resolved Rayleigh measurements. Results are reported for co-swirling and counter-swirling flow configurations of the swirling jets and are obtained at six axial locations and many radial locations at the inlet region of the combustor.
- OSTI ID:
- 5621193
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AIR
ALKANES
COHERENT SCATTERING
COMBUSTORS
DENSITY
ELECTROMAGNETIC RADIATION
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
LASER RADIATION
MEASURING INSTRUMENTS
MEASURING METHODS
METHANE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RAMAN EFFECT
RAYLEIGH SCATTERING
SCATTERING
VORTEX FLOW
421000* -- Engineering-- Combustion Systems
AIR
ALKANES
COHERENT SCATTERING
COMBUSTORS
DENSITY
ELECTROMAGNETIC RADIATION
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
LASER RADIATION
MEASURING INSTRUMENTS
MEASURING METHODS
METHANE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RAMAN EFFECT
RAYLEIGH SCATTERING
SCATTERING
VORTEX FLOW