Statistics – Methodology
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........24e&link_type=abstract
Thesis (PH.D.)--MISSISSIPPI STATE UNIVERSITY, 1992.Source: Dissertation Abstracts International, Volume: 54-06, Section: B, page
Statistics
Methodology
Scientific paper
This study details the development of numerical techniques for the accurate predictions of radiative heat transfer for two dimensional and axisymmetric hypersonic flows in chemical nonequilibrium. A Full Radiative model is developed by applying numerical integration formulae directly to the expression for the radiative source term. The methodology requires that a radiation grid be superimposed on the flowfield grid such that integrations over length and direction of propagation can be performed, thus calculating the radiative source term without any simplifying assumptions as to the flowfield geometry. The resulting algorithm is not restricted to particular (geometric) regions of the flowfield. The radiative transport calculations are fully coupled to the flowfield simulations via the modification of an existing thermo-chemical nonequilibrium flow solver. The new Full Radiative model is compared to the Quasi-One-Dimensional and Emission Dominated models as well as a baseline no radiation case. The test cases involve a cylinder/sphere with a 1.5 meter radius, a velocity of 15 km/sec and an altitude of 60 kilometers. The effects from three thermo-chemical models, viscosity and two absorptivity coefficient models are investigated. The maximum radiative heating loads at the stagnation point are strongly affected by the choice of thermo-chemical model and the absorptivity coefficient model. Among the three radiative models, non -negligible differences in the stagnation point radiative heating loads are predicted, with the new Full Radiative model providing the smallest values. The results indicate that "truly" two dimensional and axisymmetric capabilities are an important issue for the accurate predictions of aerothermodynamic heating loads, and suggest that the same will hold for three dimensional problems.
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