Abstract
Detonation initiation in a liquid-fuel pulse detonation engine (PDE) was experimentally investigated. The PDE at Hiroshima University consisted of an initiator and a main combustor. The initiator was filled with liquid-fuel-oxygen mixture, and the main combustor was filled with liquid-fuel-air mixture. The experiments were carried out with varying the volume of the initiator and of the injected liquid-fuel-oxygen mixture. It was found that the predominant factor to initiate a detonation wave of liquid-fuel-air mixture was the volume of the overflowed liquid-fuel-oxygen mixture from the initiator into the main combustor. That is, we found that the minimum overflowed volume for the detonation initiation existed.
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