Criticality for stabilized Chapman-Jouguet oblique detonation wave around sphere bodies in acetylene-oxygen-krypton mixtures

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

Research output: Contribution to conferencePaper

Abstract

The criticality for the C-J detonation waves was studied. The first expression of the criticality was a mean-curvature coefficient, a rate between a detonation cell width and a mean-curvature radius in which the normal velocity component was the Chapman-Jouguet (C-J) velocity, was 5.03 The mean-curvature coefficient was constant and did not depend on the type of mixture (H2-O2-Ar or C2H2-O2-Ar), initial mixture pressure, projectile diameter, projectile velocity nor diluent mole fraction. A more accurate mean-curvature coefficient for stabilized oblique C-J detonation around symmetric sphere bodies in highly-krypton-diluted acetylene-oxygen mixtures having extremely low C-J velocities was obtained. The mean-curvature coefficient of 7.8 was the most important value for stabilizing the self-sustained oblique detonation waves around multi-dimensional bodies. A lower velocity projectile could stabilize a self-sustained oblique detonation wave more effectively than could a higher velocity one. 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, which was the secondary expression of the criticality and identical with the present and past experimental results, was proposed. Original is an abstract.

Original languageEnglish
Number of pages1
Publication statusPublished - 2002 Jan 1
Externally publishedYes
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: 2002 Jul 212002 Jul 26

Other

Other29th International Symposium on Combustion
CountryJapan
CitySapporo
Period02/7/2102/7/26

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Kasahara, J., Arai, T., Chiba, S., Takazawa, K., Tanahashi, Y., & Matsuo, A. (2002). Criticality for stabilized Chapman-Jouguet oblique detonation wave around sphere bodies in acetylene-oxygen-krypton mixtures. Paper presented at 29th International Symposium on Combustion, Sapporo, Japan.