Front shock behavior of stable detonation waves propagating through rectangular cross-section curved channels

Hisahiro Nakayama, Takahiro Moriya, Jiro Kasahara, Akiko Matsuo, Ikkoh Funaki

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

1 Citation (Scopus)

Abstract

Visualization experiments employing rectangular cross-section curved channels were performed in order to investigate the fundamental propagation characteristics of curved celluar detonation waves (CCDWs) stabilized in annular channels. A C2H4+3O2 mixture gas and five types of curved channels with different inner radii of curvature were used. The ratio of the inner radius of curved channel (ri) to the normal detonation cell width (λ) was an important factor determining the stability of the CCDWs. The detonation propagation mode in the curved channels transitioned from unstable to stable in the range 14 ≤ ri/λ ≤ 23. The shapes of the CCDWs stabilized in the curved channels became a specific curved shape. The normal detonation velocity (D n) on a CCDW stabilized in a curved channel was approximately formulated. The approximated Dn given by the formula agreed well with the experimental results. The front shock shapes of the stabilized CCDWs could be reconstructed accurately using the formula. The value of Dn nondimensionalized by the Chapman-Jouguet detonation velocity (DCJ) became a function of the curvature of the stabilized CCDWs (κ) nondimensionalized by λ, regardless of the type of curved channel, hence the front shock evolution of the stabilized CCDWs was controlled by this D n/DCJ- λκ relation. Self-similarity was seen in the front shock shapes of the stabilized CCDWs under constant ri/λ conditions.

Original languageEnglish
Title of host publication50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
DOIs
Publication statusPublished - 2012
Event50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States
Duration: 2012 Jan 92012 Jan 12

Other

Other50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityNashville, TN
Period12/1/912/1/12

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ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Nakayama, H., Moriya, T., Kasahara, J., Matsuo, A., & Funaki, I. (2012). Front shock behavior of stable detonation waves propagating through rectangular cross-section curved channels. In 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition [AIAA 2012-0618] https://doi.org/10.2514/6.2012-618