Pressure Measurements at the Focus of Combustion-Driven Implosions.
TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES
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A detailed experimental investigation was made of time-resolved pressure histories at the focus of combustion-driven implosions in the UTIAS 20 cm diam Implosion Chamber. Gaseous mixtures of stoichiometric hydrogen and oxygen were used in the initial pressure range 1.7 atm 25 psi to 6.8 atm 100 psi. The gaseous mixtures were detonated using exploding wires. Extended records from a PCB 119M08, 6.3 mm diam piezoelectric pressure transducer gave detailed averaged pressure-time histories of initial and subsequent implosions. A 20-degree conical liner normally used to protect the front plate of the implosion chamber from damaging off-centered explosive-driven implosions was used to determine its effect on the pressure histories obtained at the focus of gas-driven implosions. Owing to its deviation from a cone near the apex, the presence of such a liner reduced the peak pressures by about 45. This fact allowed an indirect estimate of the peak pressure for a 6.8 atm 100 psi initial pressure run.
- Metallurgy and Metallography
- Fluid Mechanics
- Combustion and Ignition