Modification of the X3 Expansion Tube as a Low Speed Shock Tube

Butler, Daniel (2012). Modification of the X3 Expansion Tube as a Low Speed Shock Tube B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Butler, Daniel
Thesis Title Modification of the X3 Expansion Tube as a Low Speed Shock Tube
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2012
Thesis type B.Sc Thesis
Supervisor D. E. Gildfind
R. G. Morgan
Total pages 129
Language eng
Subjects 091405 Mining Engineering
Formatted abstract
In the underground coal mining industry coal dust explosions are an ever present threat that can cause serious damage to life and property. These explosions are typically caused by a smaller initial methane explosion which generates a shockwave and blast of air that lifts the coal dust off the mines surfaces and ignites the mixture, generating a far more devastating self propagating explosion. To help guard against this threat, coal miners spread fine stone dust in areas where the coal dust accumulates. This stone dust is lifted with the coal dust in the post shock flow and acts to absorb the heat of the explosion, thus preventing it from propagating. A new stone dusting product is driving the development of testing methods of explosion prevention measures for regulatory approval. This thesis is examining one of these methods.

The goal of this thesis is to suggest configurations and design modifications to X3 expansion tube, and other similar facilities, that would allow them to produce shockwaves with test flow durations similar to those encountered in a low speed methane explosion. From evaluation of a number of different facilities it was decided that X3 should be modified to operate as a simple shock tube in a number of possible configurations. The analysis focused on methods of prolonging the effective steady flow, which was achieved through utilizing a larger reservoir with a flow restriction. Testing of this configuration was carried out which validated the modelling and proved the effectiveness of the reservoir orifice method for this application.

Design work was carried out and a full set of manufacturing drawings produced to implement the proposed modifications on X3.
Keyword Coal dust explosion
Underground coal mining

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Mon, 15 Sep 2014, 16:16:52 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service