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Title: Effects of radiative heat transfer on the turbulence structure in inert and reacting mixing layers

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 inmore » 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.« less
Authors:
 [1] ;  [2]
  1. Aerospace Engineering, Indian Institute of Technology Kharagpur, Kharagpur (India)
  2. Institute of Aerodynamics and Fluid Mechanics, Technische Universitaet Munich, Garching (Germany)
Publication Date:
OSTI Identifier:
22403233
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Fluids (1994); Journal Volume: 27; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, 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