Deflagration-to-Detonation Transition in a Semi-Confined Slit Combustor Filled with Nitrogen Diluted Ethylene-Oxygen Mixture

Igor O. Shamshin, Vladislav S. Ivanov, Viktor S. Aksenov, Pavel A. Gusev and Sergey M. Frolov ()
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Igor O. Shamshin: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russia
Vladislav S. Ivanov: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russia
Viktor S. Aksenov: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russia
Pavel A. Gusev: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russia
Sergey M. Frolov: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics, 119991 Moscow, Russia

Energies, 2023, vol. 16, issue 3, 1-16

Abstract: The conditions for the mild initiation of the detonation of homogeneous stoichiometric ethylene-oxygen mixtures diluted with nitrogen up to ~40%vol. in a planar semi-confined slit-type combustor with a slit 5.0 ± 0.4 mm wide, simulating the annular combustor of a Rotating Detonation Engine (RDE), are determined experimentally using self-luminous high-speed video recording and pressure measurements. To ensure the mild detonation initiation, the fuel mixture in the RDE combustor must be ignited upon reaching a certain limiting (minimal) fill with the mixture and the arising flame must be transformed to a detonation via deflagration-to-detonation transition (DDT). Thus, for mild detonation initiation in a C 2 H 4 + 3O 2 mixture filling the slit, the height of the mixture layer must exceed the slit width by approximately 10 times (~50 mm), and for the C 2 H 4 + 3(O 2 + 2/5 N 2 ) mixture, by approximately 60 times. The limiting height of the mixture layer required for DDT exhibits a sharp increase at a nitrogen-to-oxygen mole ratio above 0.25. Compared to the height of the detonation waves continuously rotating in the RDE combustor in the steady-state operation mode, for a mild start of the RDE, the fill of the combustor with the explosive mixture to a height of at least four times more is required.

Keywords: rotating detonation engine; engine start-up; deflagration-to-detonation transition; ethylene-oxygen mixture; minimum layer height (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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