ARTICLE:

• NUMERICAL INVESTIGATION OF RADIATION AND TURBULENCE INTERACTIONS IN SUPERSONICALLY EXPANDING HYDROGEN -AIR JET  download article

S. N. Tiwari
College of Engineering and Technology, Old Dominion University, Norfolk, USA

T. O. Mohieldin
College of Engineering and Technology, Old Dominion University, Norfolk, USA

R. Chandrasekhar
College of Engineering and Technology, Old Dominion University, Norfolk, USA

ABSTRACT

The axisymmetric Reynolds averaged Navier-Stokes equations have been used to investigate the mixing and reaction of a supersonic hydrogen jet in a co-flowing stream of vitiated air. The Reynolds averaged Navier-Stokes equations are closed using either the two-equation, k-ε turbulence model or the Reynolds stress turbulence model. A four species, one reaction, global finite rate chemistry model is used to simulate the combustion processes. The influence of turbulence on the reaction rate is taken into account by considering finite rate burning based on the rate of decay of large turbulent eddies into small ones. The radiative heat transfer term in the energy equation is simulated using the Discrete Transfer Radiation Model (DTRM). Formulation of the equations of motion, turbulence, chemistry and radiation modeling is discussed. Extensive parametric studies are conducted to investigate the effects of grid refinement, inlet turbulence intensity, and turbulence models on the prediction of the velocity, temperature and major species concentrations. Finally, computed predictions are compared against existing experimental data.

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