Spent Gas Handling for Expansion Tubes

Gibbs, Bradley William (2007). Spent Gas Handling for Expansion Tubes B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Gibbs, Bradley William
Thesis Title Spent Gas Handling for Expansion Tubes
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2007
Thesis type B.Sc Thesis
Supervisor Richard Morgan
Total pages 115
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
The University of Queensland has completed extensive research into the flow of fluid around objects to simulate the re-entry of spacecraft into atmospheres and flow through scramjets (Jacobs et al., Unknown). This has been made possible through the use of expansion tubes which can reach gas flow velocities in excess of 10km/s (Jacobs et al., Unknown).

The expansion tubes operate on gas expanding from an extremely high pressure through to a very low pressure. Objects are placed in the path of expansion to take measurements (Davey, 2006).

Due to an X3 expansion tube upgrade at UQ the negative pressure volume (dump tank) is insufficient in size to keep sub-atmospheric pressures at a maximum operational envelope. This thesis looks at the design of a new dump tank.

The new dump tank has been designed to have an optimised volume in order to minimise negative pressure pumping time yet still hold a sub-atmospheric pressure after a maximum
envelope shock has been created (R Morgan 2007, pers. Comm., March).

Comparisons between measured pressure and predicted pressure were used on the X2 and T4 expansion tubes to find an accurate technique to calculate the required new dump tank volume. The most accurate analytical technique investigated was found to assume isentropic expansion of the gas with a specific heat ration of 1.4. One-dimensional modelling was run with unrealistic computation times and axisymmetric modelling was found to over estimate the spent gas pressure.
Keyword Expansion tube

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Tue, 16 Dec 2014, 11:33:45 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service