Influence of diaphragm properties on shock wave transmission
One detonation initiation method currently being investigated for possible use in pulse detonation engines is the ‘pre-detonator’ or ‘driver tube’ concept. In this concept, a tube filled with sensitive fuel-oxygen mixture is spark ignited and the resulting detonation wave is used to transmit a strong shock wave to a larger tube containing relatively insensitive fuel-air mixture. The high initial shock strength, together with strong reflections from the chamber walls, is effective at promoting shock initiation of fuel-air detonation. A fundamental study to understand and to optimize the performance of the pre-detonator is currently underway at DRDC Suffield [1,2]. The apparatus consists of a driver tube connected to a co-axially aligned combustion chamber of 21.6 cm diameter. Driver tubes of 4.93, 7.37 and 9.72 cm diameter are available. The driver gas is typically a stoichiometric acetylene-oxygen mixture, while the combustion chamber is filled with an acetylene-air mixture. The sensitivity of the acetylene-air is adjusted by varying its stoichiometry. In these fundamental tests, a thin plastic diaphragm is used to separate the two gases.
KeywordsShock Tube Incident Shock Diaphragm Mass Drive Section Transmitted Shock
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