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Published June 25, 2012 | Accepted Version
Book Section - Chapter Open

A Proposed Vertical Expansion Tunnel


Issues resulting from the rupture of the secondary diaphragm in an expansion tunnel may be mitigated by matching the test gas pressure and the accelerator gas pressure, orienting the tunnel vertically, and initially separating the test gas from the accelerator gas by density stratification. Two benefits are: 1) the removal of the diaphragm particulates in the test gas after its rupture and 2) the elimination of the wave system that is a result of a real secondary diaphragm having a finite thickness and mass. An inviscid perfect-gas analysis is performed to find the reservoir conditions available in the vertical expansion tunnel (VET) for comparison to a conventional expansion tunnel (ET) and a reflected shock tunnel (RST). A numerical inviscid perfect-gas analysis is presented to estimate the available test time in the VET. The effective reservoir conditions of the VET lie somewhere between the RST and the ET.

Additional Information

© 2012 American Institute of Aeronautics and Astronautics. This work was sponsored in part by AFOSR/National Center for Hypersonic Research in Laminar Turbulent Transition, for which Dr. John Schmisseur and Dr. Deepak Bose are the program managers. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Office of Scientific Research or the U.S. Government. The authors would also like to thank Siddhartha Verma for his contribution to the work.

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Accepted Version - 2012_AIAA_A_Proposed_Vertical_Expansion_Tunnel.pdf


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August 19, 2023
August 19, 2023