Toroidal Ballutes and their use in Aerocapture Manoeuvres

Houston, Morgan (2012). Toroidal Ballutes and their use in Aerocapture Manoeuvres B.Sc Thesis, School of Engineering, The University of Queensland.

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
Morgan_Houston_Thesis.pdf Full text application/pdf 3.01MB 1
Author Houston, Morgan
Thesis Title Toroidal Ballutes and their use in Aerocapture Manoeuvres
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2012
Thesis type B.Sc Thesis
Supervisor Richard Morgan
Total pages 88
Language eng
Subjects 0913 Mechanical Engineering
091405 Mining Engineering
Formatted 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].
Keyword Toroidal Ballutes
CFD based simulation

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
Citation counts: Google Scholar Search Google Scholar
Created: Fri, 26 Sep 2014, 15:47:33 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service