Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures

Jiro Kasahara, Takakage Arai, Shingo Chiba, Kouki Takazawa, Yu Tanahashi, Akiko Matsuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

24 Citations (Scopus)

Abstract

Self-sustained oblique detonation waves around projectiles were experimentally studied as part of a fundamental investigation of the application of an oblique detonation wave engine and a high-efficiency detonation wave combustor as a power generator. The mean-curvature coefficient was constant and did not depend on the type of fuel mixture (H2/O2/Ar or C2H2/O2/Ar), initial mixture pressure, projectile diameter, projectile velocity, or diluent mole fraction. A more accurate mean-curvature coefficient for stabilized oblique detonation around symmetric spherical bodies in highly krypton-diluted acetylene/oxygen mixtures that have extremely low C-J velocities was observed. A lower-velocity projectile could stabilize a self-sustained oblique detonation wave more effectively than a higher-velocity one, and the attenuation rate depended only on the non-dimensional mean-curvature radius. A mean-curvature coefficient of 7.8 was the first expression of criticality and was the most important value for generating self-sustained oblique detonation stabilized around multidimensional bodies. In the high-projectile-velocity region, the experimental critical condition was inconsistent with Lee's detonation initiation theory. A semi-empirical criticality equation for the stabilization was proposed, which was the secondary expression of the criticality and identical with present and past experimental results. This is an abstract of a paper presented at the 29th International Symposium on Combustion (Sapporo, Japan 7/21/2002).

Original languageEnglish
Title of host publicationProceedings of the Combustion Institute
EditorsJ.H. Chen, M.D. Colket
Pages2817-2824
Number of pages8
Volume29 II
Publication statusPublished - 2002
EventTwenty-Ninth International Symposium on Combustion - Sapporo, Japan
Duration: 2002 Jul 212002 Jul 25

Other

OtherTwenty-Ninth International Symposium on Combustion
CountryJapan
CitySapporo
Period02/7/2102/7/25

Fingerprint

Krypton
Acetylene
Detonation
Projectiles
Oxygen
Combustors
Stabilization
Engines

ASJC Scopus subject areas

  • Automotive Engineering

Cite this

Kasahara, J., Arai, T., Chiba, S., Takazawa, K., Tanahashi, Y., & Matsuo, A. (2002). Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures. In J. H. Chen, & M. D. Colket (Eds.), Proceedings of the Combustion Institute (Vol. 29 II, pp. 2817-2824)

Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures. / Kasahara, Jiro; Arai, Takakage; Chiba, Shingo; Takazawa, Kouki; Tanahashi, Yu; Matsuo, Akiko.

Proceedings of the Combustion Institute. ed. / J.H. Chen; M.D. Colket. Vol. 29 II 2002. p. 2817-2824.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kasahara, J, Arai, T, Chiba, S, Takazawa, K, Tanahashi, Y & Matsuo, A 2002, Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures. in JH Chen & MD Colket (eds), Proceedings of the Combustion Institute. vol. 29 II, pp. 2817-2824, Twenty-Ninth International Symposium on Combustion, Sapporo, Japan, 02/7/21.
Kasahara J, Arai T, Chiba S, Takazawa K, Tanahashi Y, Matsuo A. Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures. In Chen JH, Colket MD, editors, Proceedings of the Combustion Institute. Vol. 29 II. 2002. p. 2817-2824
Kasahara, Jiro ; Arai, Takakage ; Chiba, Shingo ; Takazawa, Kouki ; Tanahashi, Yu ; Matsuo, Akiko. / Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures. Proceedings of the Combustion Institute. editor / J.H. Chen ; M.D. Colket. Vol. 29 II 2002. pp. 2817-2824
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