Free-piston driver optimisation for simulation of high Mach number scramjet flow conditions |
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Authors: | D E Gildfind R G Morgan M McGilvray P A Jacobs R J Stalker T N Eichmann |
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Institution: | (1) G?rtnereiweg 3, 86938 Schondorf, Germany;(2) Institute of Aerodynamics and Flow Technology, Spacecraft Section, German Aerospace Center (DLR), Bunsenstra?e 10, 37073 G?ttingen, Germany;(3) Department Spacecraft, Institute of Aerodynamics and Flow Technology, Bunsenstra?e 10, 37073 G?ttingen, Germany;(4) Mechanical and Aerospace Engineering, Cornell University, 144 Upson Hall, 14853 Ithaca, NY, USA |
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Abstract: | The University of Queensland (UQ) is currently developing high Mach number, high total pressure scramjet flow conditions in
its X2 and X3 expansion tube facilities. These conditions involve shock-processing a high-density air test gas followed by
its unsteady expansion into a low-pressure acceleration tube. This relatively slow shock-processing requires the driver to
supply high pressure gas for a significantly greater duration than normally required for superorbital flow conditions. One
technique to extend the duration is to operate a tuned free-piston driver. For X2, this involves the use of a very light piston
at high speeds so that, following diaphragm rupture, the piston displacement substitutes for vented driver gas, thus maintaining
driver pressure much longer. However, this presents challenges in terms of higher piston loading and also safely stopping
the piston. This article discusses the tuned driver concept, the design of a very lightweight but highly stressed piston,
and details the successful development of a new set of tuned free-piston driver conditions for X2. |
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