Driver Gas Reduction Effect of Pulse-Detonation-Engine Initiator Using Reflecting Board

To reduce driver gas usage of a pulse detonation engine operating in airbreathing mode, the authors experimentally examined a combination method of a reflecting board and overfilling of the driver gas. This method has the potential to reduce the predetonator diameter by half and shorten the overfill...

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Bibliographic Details
Published in:Journal of propulsion and power 2011-01, Vol.27 (1), p.162-170
Main Authors: Wakita, Masashi, Numakura, Ryusuke, Asada, Takatoshi, Tamura, Masayoshi, Totani, Tsuyoshi, Nagata, Harunori
Format: Article
Language:English
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Summary:To reduce driver gas usage of a pulse detonation engine operating in airbreathing mode, the authors experimentally examined a combination method of a reflecting board and overfilling of the driver gas. This method has the potential to reduce the predetonator diameter by half and shorten the overfilling distance hh to the reflecting board position ww. Experiments with stoichiometric hydrogen-oxygen and hydrogen-air mixtures as driver and target gases, respectively, showed that the overfilling distance necessary to have a planar detonation wave propagate in a detonation chamber is reduced to 30 mm when a reflecting board is used with a reflecting board clearance of w=10mmw=10mm. With an overfilling distance of 30 mm, the transformation of the detonation wave from cylindrical to toroidal did not occur because of the mixing effect of the driver gas and the target gas around the reflecting board. A 100-mm-thick reflecting board prevents the mixing effect, and a successful transformation from cylindrical to toroidal becomes possible with an overfilling distance as small as 17.2 mm. [PUBLISHER ABSTRACT]
ISSN:0748-4658
1533-3876
DOI:10.2514/1.50043