Experimental study of a chemically reacting turbulent boundary layer

Technical Report · Tue Sep 01 00:00:00 EDT 1981

OSTI ID:5956109

Ng, T M.T.

Effects of a strong stepwise temperature rise and exothermic chemical reaction on the turbulent boundary layer over a flat plate were studied. For the reacting flow, ethylene-air mixture with equivalent ratio of 0.35 was used. High-speed Schlieren photography was used for visualization of the boundary layer thermal structures. Mean and rms density distributions were obtained from Rayleigh scattering intensity measurements. Mean and rms velocity distribution and some important fluctuation correlations were derived from single-component laser Doppler velocimetry measurements. Strong wall-heating causes the expansion of the heat-affected region near the surface and pushes the rest of the boundary layer uwards. The boundary layer thickness, the displacement thickness, the momentum thickness, and the friction coefficient are increased by the wall-heating. The Reynolds stress is reduced due to the density decrease.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5956109
• Report Number(s): LBL-13325; ON: DE82001970
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COMBUSTION
BOUNDARY LAYERS
ETHYLENE
AIR
BINARY MIXTURES
FRICTION
HEATING
PLATES
SCHLIEREN METHOD
THICKNESS
VERY HIGH TEMPERATURE
ALKENES
CHEMICAL REACTIONS
DIMENSIONS
DISPERSIONS
FLUIDS
GASES
HYDROCARBONS
LAYERS
MIXTURES
ORGANIC COMPOUNDS
OXIDATION
PHOTOGRAPHY
THERMOCHEMICAL PROCESSES
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry