Conditional Reynolds stress in a strongly heated turbulent boundary layer with premixed combustion
A two-color laser Doppler anemometry technique has been used to measure velocity statistics and Reynolds stress in a turbulent boundary layer over a strongly heated wall (T/sub w/ = 1100 K) with premixed ethylene--air combustion. Measurements in the isothermal and nonreacting heated wall turbulent boundary layers were also made for comparison. Conditional velocity covariance -approx.(uv) are deduced using the quadrant and ''hole'' analysis methods. The conditional data obtained in the isothermal layer are in exellent agreement with those deduced by others based on hot-wire data. The results obtained in the heated and reacting layers indicate that the decrease in mean Reynolds stress can be attributed to a reduction in the -approx.(uv) contributions associated with a burst of low momentum fluid form the wall. The reduction is much more significant in the reacting layer than in the heated layer. Comparison with previous density shows that the changes in conditional -approx.(uv) contributions occur mostly within the constant density sublayer of combustion products adjacent to the wall. In the region where combustion reaction takes place, no significant change in the turbulence intensities or Reynolds stress is found.
- Research Organization:
- Applied Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6162498
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:2; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AIR
ALKENES
ANEMOMETERS
BOUNDARY LAYERS
CHEMICAL REACTIONS
COMBUSTION
DISPERSIONS
DOPPLER EFFECT
ETHYLENE
FLUID FLOW
FLUIDS
GASES
HEATING
HYDROCARBONS
ISOTHERMAL PROCESSES
LASERS
LAYERS
MEASURING INSTRUMENTS
MIXING
MIXTURES
ORGANIC COMPOUNDS
OXIDATION
REYNOLDS NUMBER
THERMOCHEMICAL PROCESSES
TURBULENT FLOW
VELOCITY
VERY HIGH TEMPERATURE
WALLS