Theoretical and experimental investigation of turbulent premixed flames
A model is proposed to describe the propagation of a plane oblique flame into a turbulent flow of premixed reactants. The model incorporates a transport equation for the single or joint PDF's of passive scalers, in addition to the conservation equations of mass, momentum, energy and K.E. of turbulence. In the first phase of developing the model, the reaction mechanism was treated as a single step irreversible exothermic reaction. In this case, the PDF of the progress variable was parameterized and solved with the conservation equations. The second phase considered a two step reaction mechanism in an attempt to explore the role played by the radicals in the propagation of turbulent premixed flames. For both the two phases, the flame speed and angle are Eigenvalues of the solution. Laser Induced Fluoresence Spectroscopy (LIFS) was used to measure the PDF of OH concentration in a laboratory scale burner simulating the flame studied by the model. The premixed Methane-Air flame was stabilized on a rod flame holder downstream of a turbulence producing grid. Measurements in both the streamwise and transverse directions were made for a variety of flow conditions. The experimentally observed PDF's of the hydroxil radical concentration, and the statistical moments, were used to describe and compare the PDF's and moments of the two reaction model.
- OSTI ID:
- 6855454
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AIR
ALKANES
FLAME PROPAGATION
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
HYDROXYL RADICALS
KINETICS
LASER SPECTROSCOPY
MATHEMATICAL MODELS
MEASURING METHODS
METHANE
ORGANIC COMPOUNDS
RADICALS
REACTION KINETICS
SPECTROSCOPY
TURBULENCE