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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Печать: 2150-766X
ISSN Онлайн: 2150-7678

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International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2019027880
pages 91-109

MODAL TRANSITIONS IN ROTATING DETONATION ROCKET ENGINES

John W. Bennewitz
Air Force Research Laboratory, Edwards AFB, California 93524, USA
Blaine R. Bigler
ERC Inc., Air Force Research Laboratory, Edwards AFB, California 93524, USA
Jessica J. Pilgram
ERC Inc., Air Force Research Laboratory, Edwards AFB, California 93524, USA
William A. Hargus, Jr.
Air Force Research Laboratory, Edwards AFB, California 93524, USA

Краткое описание

Various modal transitions within a rotating detonation rocket engine (RDRE) are investigated in detail within this experimental study. Using direct high-speed visible imaging along with a recently developed processing technique, detonation mode transition events are captured and analyzed with a focus on quantifying the unsteady wave propagation behavior during a modal shift. Specifically, three transition types are discussed including a rotational direction reversal where the number of waves is held constant, an increase in the number of detonation waves, as well as a decrease in the number of waves. The rotational direction reversal exhibits intermittent counter-propagating wave behavior, which eventually results in the opposing set of waves overtaking the dominant set. The ascending and descending modal transitions are attributed to significant galloping-type detonation propagation that grows in severity for the descending shifts and decays during the ascending transitions. In general, the exponential growth/decay rate αavg,pk of the angular separation associated with the wave pairs δθ is larger for the ascending transitions than descending, where the higher wave mode is more stable (i.e., δθ' averages 8° for the three-wave mode and 39° for the two-wave mode). Also, the maximum peak-to-peak δθ' amplitude for the wave pairs separating the threshold between the two- and three-wave modes is on average 135–138° and U'wv/Uwv equals 24% for these two transition types. In total, this work provides notable insight into modal behavior that can affect the stability of RDRE's.

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