Combustion-turbulence interaction in the turbulent boundary layer over a hot surface

Conference · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5260306

Ng, T. T.; Cheng, R. K.; Robben, F.; Talbot, L.

The turbulence-combustion interaction in a reacting turbulent boundary layer over a heated flat plate was studied. Ethylene/air mixture with equivalence ratio of 0.35 was used. The free stream velocity was 10.5 m/s and the wall temperature was 1250/sup 0/K. Combustion structures visualization was provided by high-speed schlieren photographs. Fluid density statistics were deduced from Rayleigh scattering intensity measurements. A single-component laser Doppler velocimetry system was used to obtain mean and root-mean-square velocity distributions, the Reynolds stress, the streamwise and the cross-stream turbulent kinetic energy diffusion, and the production of turbulent kinetic energy by Reynolds stress. The combustion process was dominated by large-scale turbulent structures of the boundary layer. Combustion causes expansion of the boundary layer. No overall self-similarity is observed in either the velocity or the density profiles. Velocity fluctuations were increased in part of the boundary layer and the Reynolds stress was reduced. The turbulent kinetic energy diffusion pattern was changed significantly and a modification of the boundary layer assumption will be needed when dealing with this problem analytically. 11 figures, 1 table.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5260306
• Report Number(s): LBL-13893; CONF-820801-8; ON: DE82011780
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ALKENES
BOUNDARY LAYERS
CHEMICAL REACTIONS
COMBUSTION
DIMENSIONS
ENERGY
ETHYLENE
FLUIDS
GASES
HEATING
HYDROCARBONS
KINETIC ENERGY
LAYERS
ORGANIC COMPOUNDS
OXIDATION
PHOTOGRAPHY
PLATES
SCHLIEREN METHOD
THERMOCHEMICAL PROCESSES
THICKNESS
TUNNELS
TURBULENCE
UNDERGROUND FACILITIES
VELOCITY
WIND TUNNELS