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Investigation of chemically reacting and radiating supersonic flow in channels

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Abstract

The two-dimensional time dependent Navier-Stokes equations are used to investigate supersonic flows undergoing finite rate chemical reaction and radiation interaction for a hydrogen-air system. The explicit multi-stage finite volume technique of Jameson is used to advance the governing equations in time until convergence is achieved. The chemistry source term in the species equation is treated implicitly to alleviate the stiffness associated with fast reactions. The multidimensional radiative transfer equations for a nongray model are provided for general configuration, and then reduced for a planar geometry. Both pseudo-gray and nongray models are used to represent the absorption-emission characteristics of the participating species.

The supersonic inviscid and viscous, nonreacting flows are solved by employing the finite volume technique of Jameson and the unsplit finite difference scheme of MacCormack to determine a convenient numerical procedure for the present study. The specific problem considered is of the flow in a channel with a 10° compression-expansion ramp. The calculated results are compared with the results of an upwind scheme and no significant differences are noted. The problem of chemically reacting and radiating flows are solved for the flow of premixed hydrogen-air through a channel with parallel boundaries, and a channel with a compression corner. Results obtained for specific conditions indicate that the radiative interaction can have a significant influence on the entire flowfield.

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Abbreviations

A :

band absorptance (m−1)

A o :

band width parameter (m−1)

C j :

concentration of thejth species (kg mol/m3)

C o :

correlation parameter ((N/m2)−1m−1)

C p :

constant pressure specific heat (J/kgK)

e∞:

Planck's function (J/m2S)

E :

total internal energy (J/kg)

f j :

mass fraction of thejth species

h :

static enthalpy of mixture (J/kg)

H :

total enthalpy (J/kg)

I :

identity matrix

I v :

spectral intensity (J/m s)

I bv :

spectral Planck function

k :

thermal conductivity (J/m sK)

K b :

backward rate constant

K f :

forward rate constant

I:

unit vector in the direction of\(\overline{\overline {PP_w }}\)

M j :

molecular weight of thejth species (kg/kg mol)

P :

pressure (N/m2)

P j :

partial pressure of thejth species (N/m2)

P e :

equivalent broadening pressure ratio

Pr:

Prandtl number

P w :

a point on the wall

q R :

total radiative heat flux (J/m2 s)

\(q_{_{R_\omega } }\) :

spectral radiative heat flux (J/m3 s)

R :

gas constant (J/KgK)

r w :

distance between the pointsP andP w(m)

S :

integrated band intensity ((N/m2)−1/m−2)

S :

integrated band intensity ((N/m2)−1 m−2)

T :

temperature (K)

u, v :

velocity inx andy direction (m/s)

\(\dot w_j\) :

production rate of thejth species (kg/m3 s)

x, y :

physical coordinate

z :

dummy variable in they direction

γ:

ratio of specific heats

Δt ch :

chemistry time step (s)

Δt f :

fluid-dynamic time step (s)

κ:

absorption coefficient (m−1)

κλ,κv :

spectral absorption coefficient (m−1)

κp :

Planck mean absorption coefficient

λ:

second coefficient of viscosity, wavelength (m)

μ:

dynamic viscosity (laminar flow) (kg/m s)

ξ, η:

computational coordinates

ρ:

density (kg/m3)

σ:

Stefan-Boltzmann constant (erg/s cm2 K3)

τ:

shear stress (W/m2)

φ:

equivalence ratio

ω:

wave number (m−1)

νc :

frequency at the band center

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Author information

Authors and Affiliations

  1. Department of Propulsion and Thermodynamics, McDonnell Aircraft Company, 63166, St. Louis, MO, USA

    M. Mani

  2. Department of Mechanical Engineering and Mechanics, Old Dominion University, 23529-0247, Norfolk, VA, USA

    S. N. Tiwari

  3. Computational Methods Branch, High Speed Aerodynamics Division, NASA Langley Research Center, 23665, Hampton, VA, USA

    J. P. Drummond

Authors
  1. M. Mani
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  2. S. N. Tiwari
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  3. J. P. Drummond
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Mani, M., Tiwari, S.N. & Drummond, J.P. Investigation of chemically reacting and radiating supersonic flow in channels. Appl. Sci. Res. 50, 43–68 (1993). https://doi.org/10.1007/BF01086452

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  • DOI: https://doi.org/10.1007/BF01086452

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