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Development of a continuously operating pulsed detonation engine
(PDE) without a high energy ignition system or a deflagration-to-
detonation transition (DDT) device will increase engine efficiency,
reduce cost, improve performance, and reduce weight. This report is
a study of configurations that allow a consistent and predictable
transition of a detonation from one detonation tube to second tube.
The intent was, via visualization of detonation propagation through
a cross-over tube, to develop a cross-over passage leading to
minimization of energy losses and effective and repeatable
tube-to-tube initiation. Detonation tube cross-over width,
cross-over geometry and fuels were varied to determine their effect
on tube-to-tube detonation initiation. The cross-over detonations
studied decoupled into and out of the cross-over tube due to
propagation as subcritical spherical detonations. It was shown that
the mechanism of shock reflection could be used to transition the
spherical detonation back to a planar detonation.
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