Effects of radiative heat transfer on the turbulence structure in inert and reacting mixing layers
- Aerospace Engineering, Indian Institute of Technology Kharagpur, Kharagpur (India)
- Institute of Aerodynamics and Fluid Mechanics, Technische Universitaet Munich, Garching (Germany)
We use large-eddy simulation to study the interaction between turbulence and radiative heat transfer in low-speed inert and reacting plane temporal mixing layers. An explicit filtering scheme based on approximate deconvolution is applied to treat the closure problem arising from quadratic nonlinearities of the filtered transport equations. In the reacting case, the working fluid is a mixture of ideal gases where the low-speed stream consists of hydrogen and nitrogen and the high-speed stream consists of oxygen and nitrogen. Both streams are premixed in a way that the free-stream densities are the same and the stoichiometric mixture fraction is 0.3. The filtered heat release term is modelled using equilibrium chemistry. In the inert case, the low-speed stream consists of nitrogen at a temperature of 1000 K and the highspeed stream is pure water vapour of 2000 K, when radiation is turned off. Simulations assuming the gas mixtures as gray gases with artificially increased Planck mean absorption coefficients are performed in which the large-eddy simulation code and the radiation code PRISSMA are fully coupled. In both cases, radiative heat transfer is found to clearly affect fluctuations of thermodynamic variables, Reynolds stresses, and Reynolds stress budget terms like pressure-strain correlations. Source terms in the transport equation for the variance of temperature are used to explain the decrease of this variance in the reacting case and its increase in the inert case.
- OSTI ID:
- 22403233
- Journal Information:
- Physics of Fluids (1994), Vol. 27, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-6631
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
ABSORPTION
HEAT TRANSFER
HYDROGEN
LARGE-EDDY SIMULATION
LAYERS
MIXTURES
NITROGEN
NONLINEAR PROBLEMS
OXYGEN
REYNOLDS NUMBER
SOURCE TERMS
STOICHIOMETRY
STRAINS
STREAMS
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMICS
TRANSPORT THEORY
TURBULENCE
WATER VAPOR
WORKING FLUIDS