Simulation of a complete reflected shock tunnel showing a vortex mechanism for flow contamination

Goozee, RJ, Jacobs, PA and Buttsworth, DR (2006) Simulation of a complete reflected shock tunnel showing a vortex mechanism for flow contamination. Shock Waves, 15 3-4: 165-176. doi:10.1007/s00193-006-0015-4


Author Goozee, RJ
Jacobs, PA
Buttsworth, DR
Title Simulation of a complete reflected shock tunnel showing a vortex mechanism for flow contamination
Journal name Shock Waves   Check publisher's open access policy
ISSN 0938-1287
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1007/s00193-006-0015-4
Volume 15
Issue 3-4
Start page 165
End page 176
Total pages 12
Place of publication New York
Publisher Springer
Language eng
Subject C1
290501 Mechanical Engineering
660401 Industry
Abstract Simulations of a complete reflected shock tunnel facility have been performed with the aim of providing a better understanding of the flow through these facilities. In particular, the analysis is focused on the premature contamination of the test flow with the driver gas. The axisymmetric simulations model the full geometry of the shock tunnel and incorporate an iris-based model of the primary diaphragm rupture mechanics, an ideal secondary diaphragm and account for turbulence in the shock tube boundary layer with the Baldwin-Lomax eddy viscosity model. Two operating conditions were examined: one resulting in an over-tailored mode of operation and the other resulting in approximately tailored operation. The accuracy of the simulations is assessed through comparison with experimental measurements of static pressure, pitot pressure and stagnation temperature. It is shown that the widely-accepted driver gas contamination mechanism in which driver gas 'jets' along the walls through action of the bifurcated foot of the reflected shock, does not directly transport the driver gas to the nozzle at these conditions. Instead, driver gas laden vortices are generated by the bifurcated reflected shock. These vortices prevent jetting of the driver gas along the walls and convect driver gas away from the shock tube wall and downstream into the nozzle. Additional vorticity generated by the interaction of the reflected shock and the contact surface enhances the process in the over-tailored case. However, the basic mechanism appears to operate in a similar way for both the over-tailored and the approximately tailored conditions.
Keyword Mechanics
Shock Tunnel
Driver Gas Contamination
Bifurcated Reflected Shock
Numerical-simulation
Tube
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 19:13:52 EST