AIAA Aviation Conference Papers Added

Posted on June 22, 2016June 22, 2016 by cobalt_admin | No Comments

The following papers from the summer AIAA Aviation Conference have been added to our publication page:

Virtual Flight Testing of High Performance Fighter Aircraft Using High-Resolution CFD
Ratcliff, Bodkin, Clifton and Willis, AIAA-2016-3854, Jun 2016
Canard-Wing Interference Effects on the Flight Characteristics of a Transonic Passenger Aircraft
Harrison, Darragh, Hamlington, Ghoreyshi and Lofthouse, AIAA-2016-4179, Jun 2016
Evaluation of Reduced-Order Models for Predictions of Separated and Vortical Flows
Darragh, Hamlington, Ghoreyshi and Lofthouse, AIAA-2016-4325, Jun 2016

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The equilibrium air module uses the curve fits of Tannehill, et al. to calculate the thermodynamic and molecular properties of air when intermolecular forces become important. As temperature becomes large, dissociation and eventually ionization occurs. The thermodynamic properties of air become dependent on two variables (T = T(P,e)). For hypersonic flows, this has the effect of weakening the strength of a shock wave. The table below shows the temperatures at which dissociation and ionization become important. Molecular vibrations start occurring around T=600 K which is the temperature value where starts γ changing.

Temperature Range	Chemical Composition
T < 2500 K	78% N₂, 21% O₂
2500 K < T < 4000 K	Oxygen dissociation regime. Some NO is formed
4000 K < T < 8000 K	Nitrogen dissociation regime. Oxygen is fully dissociated.
8000 K < T	Ionization of atomic constituents occurs