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- W93240172 abstract "The thesis titled, Toroidal Ballutes and their use in Aerocapture Manoeuvres is contained herein. The scope of the thesis will investigate the flow stability of tether-ballute systems. A standalone two-dimensional toroidal ballute will be examined using an ANSYS Fluent Computational Fluid Dynamics (CFD) simulation. This will be modelled in 2D as a two adjacent cylinders.A shock tunnel experiment was also conducted in The University of Queensland's X2 shock tunnel. The experiment investigated the interaction between a ballute and tether and observed the interaction to determine if it resulted in flow instability.Literature on aerocapture manoeuvres, the technical challenges to ballute implementation such as ballute geometry selection, aerothermodynamics, flow stability and flow shapes was reviewed and critically analysed.A CFD simulation was carried out on a standalone toroidal ballute to investigate the shock flow pattern over this geometry. The toroidal ballute was modelled as two adjacent cylinders in two dimensions.An X2 shock tunnel experiment was conducted to model the entry into Earth's atmosphere. Image of this shock wave was captured using a high speed camera. Further research work in this field could focus on running shock tunnel tests with longer tethers to investigate the effect of this on the resulting interaction.It was concluded that the shock interaction observed in the X2 test was caused by the tether wake propagating downstream and causing an unsteady interaction with the bow shock off the ballute face. As this interaction has no mechanism for transmitting information upstream, it is concluded that it will not result in flight instability. The CFD simulations produced converging bow shocks and Mach disks (detailed in Figure 29) consistent with the described flow pattern discussed by Wang [30]." @default.
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- W93240172 date "2012-01-01" @default.
- W93240172 modified "2023-09-27" @default.
- W93240172 title "Toroidal Ballutes and their use in Aerocapture Manoeuvres" @default.
- W93240172 hasPublicationYear "2012" @default.
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