Radiative interactions in a hydrogen-fueled supersonic combustorThe two-dimensional, elliptic Navier-Stokes equations are used to investigate supersonic flows with finite-rate chemistry and 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 flow in a channel with a 10-deg compression ramp. Three different chemistry models are used, accounting for increasing number of reactions and participating species. Two chemistry models assume nitrogen as inert, while the third model accounts for nitrogen reactions and NO(x) formation. The tangent slab approximation is used in the radiative flux formulation. A pseudogray model is used to represent the absorption-emission characteristics of the participating species. Results otained for specific conditions indicate that the radiative interactions vary substantially, depending on reactions involving HO2 and NO species, and that this can have a significant influence on the flowfield.
Document ID
19910036850
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chandrasekhar, R. (Old Dominion Univ. Norfolk, VA, United States)
Tiwari, S. N. (Old Dominion University Norfolk, VA, United States)
Drummond, J. P. (NASA Langley Research Center Hampton, VA, United States)