Computational Study of Deflagration-to-Detonation Transition in a Semi-Confined Slit Combustor

Vladislav S. Ivanov, Igor O. Shamshin and Sergey M. Frolov ()
Additional contact information
Vladislav S. Ivanov: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics (FRC), Moscow 119991, Russia
Igor O. Shamshin: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics (FRC), Moscow 119991, Russia
Sergey M. Frolov: Department of Combustion and Explosion, Semenov Federal Research Center for Chemical Physics (FRC), Moscow 119991, Russia

Energies, 2023, vol. 16, issue 20, 1-28

Abstract: Systematic three-dimensional numerical simulations of flame acceleration and deflagration-to-detonation transition (DDT) in a semi-confined flat slit combustor are performed. The combustor is assumed to be partly filled with the stoichiometric ethylene–oxygen mixture at normal pressure and temperature conditions. The objective of the study is to reveal the conditions for DDT in terms of the minimum height of the combustible mixture layer in the slit, the maximum dilution of the mixture with nitrogen and the maximum slit width. The results of the calculations are compared with the available experimental data. The calculation results are shown to agree satisfactorily with the experimental data on the slit-filling dynamics, flame structure, the occurrence of the preflame self-ignition center, DDT, and detonation propagation. DDT occurs in the layer at a time instant when the flame accelerates to a velocity close to 750 m/s. DDT occurs near the slit bottom due to the formation of the self-ignition center ahead of the leading edge of the flame as a result of shock wave reflections from the walls of injector holes at the slit bottom and from the corners of the conjugation of the slit bottom and side walls. The decrease in the height of the mixture layer, the dilution of the mixture with nitrogen, and the increase in the slit width are shown to slow down flame acceleration in the slit and increase the DDT run-up distance and time until DDT failure. The obtained results are important for determining the conditions for mild initiation of detonation via DDT in semi-confined annular RDE combustors.

Keywords: rotating detonation engine; deflagration-to-detonation transition; ethylene-oxygen mixture; minimum layer height; maximum nitrogen dilution ratio; maximum slit width; computational fluid dynamics (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
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/20/7028/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/20/7028/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:20:p:7028-:d:1256961

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().