Analysis of turbulent free jet hydrogen-air diffusion flames with finite chemical reaction rates. Final report
The nonequilibrium flow field resulting from the turbulent mixing and combustion of a supersonic axisymmetric hydrogen jet in a supersonic parallel coflowing air stream is analyzed. Effective turbulent transport properties are determined using the (K-epsilon) model. The finite-rate chemistry model considers eight reactions between six chemical species, H, O, H2O, OH, O2, and H2. The governing set of nonlinear partial differential equations is solved by an implicit finite-difference procedure. Radial distributions are obtained at two downstream locations of variables such as turbulent kinetic energy, turbulent dissipation rate, turbulent scale length, and viscosity. The results show that these variables attain peak values at the axis of symmetry. Computed distributions of velocity, temperature, and mass fraction are also given. A direct analytical approach to account for the effect of species concentration fluctuations on the mean production rate of species (the phenomenon of unmixedness) is also presented. However, the use of the method does not seem justified in view of the excessive computer time required to solve the resulting system of equations.
- Research Organization:
- Toronto Univ., Ontario (Canada). Inst. for Aerospace Studies
- OSTI ID:
- 6281244
- Report Number(s):
- N-78-30551
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
080800* -- Hydrogen-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
CRYOGENIC FLUIDS
ELEMENTS
FLAMES
FLUID FLOW
FLUIDS
GASES
HYDROGEN
KINETICS
NONMETALS
REACTION INTERMEDIATES
REACTION KINETICS
SUPERSONIC FLOW
TURBULENCE