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Llandysul, United Kingdom

Thomas G.O.,Combustion Hazard Research | Oakley G.L.,Aber Shock and Detonation Research Ltd
Process Safety and Environmental Protection | Year: 2010

The paper describes the results from experimental studies and theoretical predictions of the final overpressures developed on combustion of a partial volume inside a larger closed vessel. The partial volume is assumed flammable whilst the remainder of the volume is initially filled with air alone. Particular attention is given to partial volumes of hydrogen-air mixtures. The accuracy of two theoretical models for predicting the final equilibrium pressure throughout the entire closed volume are also assessed. © 2009 The Institution of Chemical Engineers. Source


Thomas G.O.,Combustion Hazard Research | Oakley G.L.,Aber Shock and Detonation Research Ltd
Process Safety and Environmental Protection | Year: 2010

An experimental test program has been undertaken on the pressure coupling between gaseous deflagration and detonations and an underlying volume of water. The two forms of gaseous explosions were initiated in an ullage space within of a closed cylindrical metal vessel. The vessel, placed in a vertical orientation, and was 2 m high and 0.247 m diameter. The depth of water used for the experiments was 1.44 m. For the combustion tests the maximum pressure recorded in the ullage was also developed in the water volume. For detonation tests however a distinct pressure wave developed in the water filled region, significantly modifying the time resolved pressure history at the vessel wall. © 2009 The Institution of Chemical Engineers. Source


Thomas G.,Aber Shock and Detonation Research Ltd
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2012

The results of experimental studies during which transition to detonation events occurred are presented. These observations and their interpretation are then discussed, and the conditions for the onset of detonation are described, with particular attention paid to the nature of the phenomena of deflagration-to-detonation transition. The resulting implications for predicting detonation evolution using computational fluid dynamic methods in practical applications are also discussed. © 2012 The Royal Society. Source


Thomas G.,Combustion Hazard Research DDTExperts | Oakley G.,Aber Shock and Detonation Research Ltd | Bambrey R.,Aber Shock and Detonation Research Ltd
Process Safety and Environmental Protection | Year: 2010

The paper summarizes the results of experimental tests and accompanying analyses to investigate the factors that govern flame acceleration and potential transition to detonation in a relatively long unobstructed piping system. The overall aim of the work was to obtain sufficient experimental data so as to be able to develop and evaluate methodologies for classifying and predicting potential detonation flame acceleration and deflagration to detonation transition (DDT) hazard in industrial process pipes and mixtures. The present results show that the flame acceleration process in an unobstructed pipe exhibit three distinct phases: an initial establishment phase; a second rapid acceleration phase and a final transition to detonation phase. Test results with ethylene indicate that the acceleration process is not sensitive to initial pressure (all other parameters remaining constant) but can be sensitivity to initial pipe wall temperature or possibly mixture humidity. The presence of bends increases the local rate of turbulent combustion, an effect attributed to the additional turbulence generated downstream of the bend. For straight pipes, detonation was only observed to develop for hydrogen-air and ethylene-air mixtures. Detonation was not observed with methane, propane or acetone as fuel in the present piping apparatus. © 2010 The Institution of Chemical Engineers. Source

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