The performance of a diaphragm shock tube with an imploding detonation driver is theoretically and experimentally investigated. Strong shock waves are produced by a driver in which a detonation is forced to implode to the apex of a conical channel. In this geometry, the area convergence experienced by the imploding front elevates the driver gas temperature and pressure above the usual Chapman-Jouguet values, thereby increasing the strength of the test shock.
Theoretically, the relationship between test shock strength, filling pressure, and area reduction in a conical channel is studied. Experimentally, the importance of the geometric parameters - slant angle, channel width and channel convergence - is investigated.
The performance of the conical implosion driver compares well with that
of other membrane shock tubes. For instance, for oxy-acetylene detonations,
driving into argon of 5 Torr, a Mach number greater than 13 may be reached for
a driver to test gas pressure ratio of 100. The same Mach number available
from a Chapman-Jouguet detonation driver occurs only above a pressure ratio
of 200. For cold hydrogen and constant volume oxy-hydrogen combustion, pressure ratios of 10⁶ and 2 X 10⁴ respectively are required to produce Mach 13.
Design criteria for a large area reduction driving facility are also given. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/33616 |
| Date | January 1971 |
| Creators | Redfern, Paul Joseph |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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