Experimental study of combustion in a turbulent boundary layer
The effect of H/sub 2/--Air combustion on induced turbulence in a heated boundary layer has been studied through time and space resolved measurements of velocity (laser Doppler anemometry) and density (Rayleigh scattering). From these measurements mean, rms fluctuations, probability density functions and auto-correlations were obtained by digital processing. The experimental conditions covered equivalence ratio from 0 to 0.3, wall temperature between 1100 to 1300/sup 0/K and free stream velocity from 14 to 22 m/sec. A typical Reynolds number based on the free stream velocity was 3 x 10/sup 5/. Three modes of combustion were indicated: (1) surface reaction, (2) surface reaction combined with gas phase reaction in the boundary layer, (3) flame-like structure situated at the edge of the boundary layer. Velocity fluctuations of about 4% in the non-heated boundary layer were reduced to 2% by wall heating. Density fluctuations of 8 to 10% were observed in the heated boundary layer both with and without combustion. The maximum density gradient region of the flame-like structure was found to fluctuate at a fairly regular rate of 0.5 to 1.25 Khz depending on various conditions.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6129003
- Report Number(s):
- LBL-8946; CONF-790721-1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Combustion-turbulence interaction in the turbulent boundary layer over a hot surface
Conditional Reynolds stress in a strongly heated turbulent boundary layer with premixed combustion
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AIR
BOUNDARY LAYERS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
CRYOGENIC FLUIDS
DATA
DATA FORMS
ELEMENTS
EXPERIMENTAL DATA
FLUID FLOW
FLUIDS
GASES
GRAPHS
HYDROGEN
INFORMATION
KINETICS
LAYERS
NONMETALS
NUMERICAL DATA
REACTION KINETICS
TURBULENCE