Design of a Free Field Blast Simulating Shock Tube
A 30.5 cm diameter, detonation driven shock tube facility has been designed, constructed and tested. The design goals of the shock tube were to reproduce free field blast wave profiles on a laboratory scale using atmospheric gaseous detonation as the energy source. Numerical simulations were utilize...
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Université d'Ottawa / University of Ottawa
2015
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Online Access: | http://hdl.handle.net/10393/32241 http://dx.doi.org/10.20381/ruor-3904 |
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ndltd-uottawa.ca-oai-ruor.uottawa.ca-10393-322412018-01-05T19:02:17Z Design of a Free Field Blast Simulating Shock Tube Armstrong, Jonathan Radulescu, Matei Shock tube Friedlander Blast Wave Simulation Shock wave Design A 30.5 cm diameter, detonation driven shock tube facility has been designed, constructed and tested. The design goals of the shock tube were to reproduce free field blast wave profiles on a laboratory scale using atmospheric gaseous detonation as the energy source. Numerical simulations were utilized to explore the gas dynamic evolution inside detonation driven shock tubes and to select the optimal design parameters for the shock tube.The Friedlander profile was used to evaluate the generated pressure profiles as an approximation of free field blast waves. It has been found that the detonation driver length should be kept below 20% of the total length of the tube in order to produce Friedlander waves. Additionally, it has been found that an annular vent can be added to the shock tube to enhance the negative phase of the blast profile, more accurately reproducing real free field blast waves. The shock tube has been constructed in a modular fashion from 2.54 cm thick steel tubing. An adjustable bag type diaphragm has been employed to allow for a variable driver size and a high voltage ignition system is used to initiate detonation in the driver section. Due to the available location for the shock tube, tests using the vented configuration could not be accomplished for safety reasons. Conducted experiments produced results that agree well with corresponding numerical simulations. Overall, the shock tube design was successful in creating Friedlander blast waves. At the time of writing, a manufacturer error in correctly reporting the specifications of the clamps used on the shock tube resulted in a lower maximum pressure of operation. 2015-04-17T17:18:46Z 2015-04-17T17:18:46Z 2015 2015 Thesis http://hdl.handle.net/10393/32241 http://dx.doi.org/10.20381/ruor-3904 en Université d'Ottawa / University of Ottawa |
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NDLTD |
language |
en |
sources |
NDLTD |
topic |
Shock tube Friedlander Blast Wave Simulation Shock wave Design |
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Shock tube Friedlander Blast Wave Simulation Shock wave Design Armstrong, Jonathan Design of a Free Field Blast Simulating Shock Tube |
description |
A 30.5 cm diameter, detonation driven shock tube facility has been designed, constructed and tested. The design goals of the shock tube were to reproduce free field blast wave profiles on a laboratory scale using atmospheric gaseous detonation as the energy source. Numerical simulations were utilized to explore the gas dynamic evolution inside detonation driven shock tubes and to select the optimal design parameters for the shock tube.The Friedlander profile was used to evaluate the generated pressure profiles as an approximation of free field blast waves. It has been found that the detonation driver length should be kept below 20% of the total length of the tube in order to produce Friedlander waves. Additionally, it has been found that an annular vent can be added to the shock tube to enhance the negative phase of the blast profile, more accurately reproducing real free field blast waves. The shock tube has been constructed in a modular fashion from 2.54 cm thick steel tubing. An adjustable bag type diaphragm has been employed to allow for a variable driver size and a high voltage ignition system is used to initiate detonation in the driver section. Due to the available location for the shock tube, tests using the vented configuration could not be accomplished for safety reasons. Conducted experiments produced results that agree well with corresponding numerical simulations. Overall, the shock tube design was successful in creating Friedlander blast waves. At the time of writing, a manufacturer error in correctly reporting the specifications of the clamps used on the shock tube resulted in a lower maximum pressure of operation. |
author2 |
Radulescu, Matei |
author_facet |
Radulescu, Matei Armstrong, Jonathan |
author |
Armstrong, Jonathan |
author_sort |
Armstrong, Jonathan |
title |
Design of a Free Field Blast Simulating Shock Tube |
title_short |
Design of a Free Field Blast Simulating Shock Tube |
title_full |
Design of a Free Field Blast Simulating Shock Tube |
title_fullStr |
Design of a Free Field Blast Simulating Shock Tube |
title_full_unstemmed |
Design of a Free Field Blast Simulating Shock Tube |
title_sort |
design of a free field blast simulating shock tube |
publisher |
Université d'Ottawa / University of Ottawa |
publishDate |
2015 |
url |
http://hdl.handle.net/10393/32241 http://dx.doi.org/10.20381/ruor-3904 |
work_keys_str_mv |
AT armstrongjonathan designofafreefieldblastsimulatingshocktube |
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