Delusive Influence of Nondimensional Numbers in Canonical Hypersonic Nonequilibrium Flows
Publication: Journal of Aerospace Engineering
Volume 29, Issue 5
Abstract
A finite volume–based unstructured inviscid flow solver has been developed for the study of nonequilibrium effects in high enthalpy flows. Four different inviscid flux computation schemes are tested for literature reported test cases like unsteady wave motion in a shock tube and high enthalpy flow over cylinder/sphere. During the present assessment, encouraging agreement has been noticed in capturing all the essential flow features in the reacting media. Here, the Rusanov scheme is noticed to be computationally cheaper among all the schemes with noticeable diffusion around strong gradients. Shock tube test case revealed the existence of various shock Mach numbers for a given driving pressure ratio in the presence of reactions. Similarly, freestream Mach number is found to have limitations in representing the shock standoff distance in case of high enthalpy flow over cylinder and sphere. In line with this, real gas effects are prominently observed for the case of the cylinder in comparison with the sphere while predicting the complete shock shape using Billig’s correlation. In all, present investigations portray the limitations of conventional nondimensional numbers in predicting the flow features and flow properties in the presence of reactions in all the dimensionalities.
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Published In
Journal of Aerospace Engineering
Volume 29 • Issue 5 • September 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 21, 2015
Accepted: Jan 29, 2016
Published online: Apr 25, 2016
Published in print: Sep 1, 2016
Discussion open until: Sep 25, 2016
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