Turbulent combustion properties behind a confined conical stabilizer

Journal Article · Wed Jan 01 00:00:00 EST 1992 · Journal of Engineering for Gas Turbines and Power; (United States)

DOI:https://doi.org/10.1115/1.2906304· OSTI ID:5248477

Pan, J C; Schmoll, W J; Ballal, D R ^[1]

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1. Univ. of Dayton, Dayton, OH (US)

This paper reports that turbulence properties were investigated in and around the recirculation zone produced by a 45 deg conical flame stabilizer of 25 percent blockage ratio confined in a pipe supplied with a turbulent premixed methane-air mixture at a Reynolds number of 5.7 {times} 10{sup 4}. A three-component LDA system was used for measuring mean velocities, turbulence intensities, Reynolds stresses, skewness, kurtosis, and turbulent kinetic energy. It was found that wall confinement elongates the recirculation zone by acceleration the flow and narrow it by preventing means streamline curvature. For confined flames, turbulence production is mainly due to shear stress-mean strain interaction. In the region of maximum recirculation zone width and around the stagnation point, the outer stretched flame resembles a normal mixing layer and gradient-diffusion closure for velocity holds. However, an in the absence of turbulent heat flux data, counter gradient diffusion cannot be ruled out. Finally, and because of the suppression of mean streamline curvature by confinement, in combustion flow, the production of turbulence is only up to 33 percent of its damping due to dilatation and dissipation.

• OSTI ID: 5248477
• Journal Information: Journal of Engineering for Gas Turbines and Power; (United States), Vol. 114:1; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
42 ENGINEERING
AIR
MIXTURES
FLAMES
TURBULENT FLOW
METHANE
DIFFUSION
HEAT FLUX
KINETIC ENERGY
REYNOLDS NUMBER
ALKANES
DISPERSIONS
ENERGY
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
ORGANIC COMPOUNDS
092000* - Biomass Fuels- Combustion- (1990-)
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry
420400 - Engineering- Heat Transfer & Fluid Flow