Thermochemical nonequilibrium and radiative interactions in supersonic hydrogen-air combustion
Conference
·
OSTI ID:5464140
- Old Dominion University, Norfolk, VA (United States)
The two-dimensional, elliptic Navier-Stokes equations are used to investigate supersonic flows with nonequilibrium chemistry and thermodynamics, coupled with radiation, for hydrogen-air systems. The chemistry source term in the species equation is treated implicitly to alleviate the stiffness associated with fast reactions. The explicit, unsplit MacCormack finite-difference scheme is used to advance the governing equations in time, until convergence is achieved. The specific problem considered is the premixed, expanding flow in a supersonic nozzle. The reacting flow consists of seven species, one of which is the inert N2 molecule. The thermal state of the gas is modeled with one translational-rotational temperature and five vibrational temperatures. The harmonic oscillator model is used in the formulation for vibrational relaxation. The tangent slab approximation is used in the radiative flux formulation. A pseudo-gray model is used to represent the absorption-emission characteristics of the participating species. Results obtained for specific conditions indicate the presence of nonequilibrium in the expansion region. This reduces the radiative interactions and can have a significant influence on the flowfield. 49 refs.
- Research Organization:
- National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
- OSTI ID:
- 5464140
- Report Number(s):
- AIAA-Paper--92-0340; CONF-920157--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
08 HYDROGEN
083000* -- Hydrogen-- Combustion-- (1990-)
AIR FLOW
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COMBUSTION
COMBUSTION KINETICS
DIFFERENTIAL EQUATIONS
EQUATIONS
FINITE DIFFERENCE METHOD
FLUID FLOW
FUEL-AIR RATIO
FUELS
GAS FLOW
HYDROGEN FUELS
ITERATIVE METHODS
KINETICS
NAVIER-STOKES EQUATIONS
NOZZLES
NUMERICAL SOLUTION
OXIDATION
PARTIAL DIFFERENTIAL EQUATIONS
RADIATION TRANSPORT
REACTION KINETICS
SUPERSONIC FLOW
SYNTHETIC FUELS
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TWO-DIMENSIONAL CALCULATIONS
083000* -- Hydrogen-- Combustion-- (1990-)
AIR FLOW
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COMBUSTION
COMBUSTION KINETICS
DIFFERENTIAL EQUATIONS
EQUATIONS
FINITE DIFFERENCE METHOD
FLUID FLOW
FUEL-AIR RATIO
FUELS
GAS FLOW
HYDROGEN FUELS
ITERATIVE METHODS
KINETICS
NAVIER-STOKES EQUATIONS
NOZZLES
NUMERICAL SOLUTION
OXIDATION
PARTIAL DIFFERENTIAL EQUATIONS
RADIATION TRANSPORT
REACTION KINETICS
SUPERSONIC FLOW
SYNTHETIC FUELS
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TWO-DIMENSIONAL CALCULATIONS