Optimising the X3R Reflected Shock Tunnel Free-Piston Driver for Long Duration Test Times
The X3R free-piston reflected shock tunnel is an alternate operating mode of the existing X3 expansion tube facility at The University of Queensland, which has been funded by Australia’s Defence Science and Technology Group to provide ground testing capability for the full-scale HIFiRE 8 scramjet engine. Given X3R’s origin as an expansion tube, its relatively short driver compared to its shock tube introduces unique design constraints during its condition development process, requiring careful tuning of the free piston to maximise the available test time. This paper details the ideal and equilibrium gas shock interactions required to provide the candidate Mach 7, 50 kPa dynamic pressure nozzle exit flow, the trends that arise as part of the driver composition selection and optimisation process, the free-piston tuning analysis used to maximise X3R’s driver supply time given its short driver, and the modelling and analysis of facility operation using one-dimensional computational techniques.
This research is supported by the Australian Government’s Research Training Program (RTP) and the Cooperative Research Centre for Space Environment Management (SERC Limited) through the Australian Government’s Cooperative Research Centre Programme.
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