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Shock Waves

, 18:35 | Cite as

Effect of laser supported detonation wave confinement on termination conditions

  • Masato Ushio
  • Kimiya Komurasaki
  • Koichi Kawamura
  • Yoshihiro Arakawa
Original Article

Abstract

A laser supported detonation (LSD) wave was driven using line-focusing laser optics, in which an induced blast wave expanded laterally from the LSD region to surrounding air in two-dimensional space. The LSD wave was confined in quasi-1D space using a wedge nozzle to restrict the lateral expansion of a blast wave. The LSD termination threshold and the blast wave energy were deduced from shadowgraphs showing the blast wave expansion. The respective threshold laser intensities for cases with and without confinement were estimated as 17 and 34 GW/m2, indicating that the lateral expansion strongly influenced on the LSD termination condition.

Keywords

Laser Blast wave Detonation Propulsion 

PACS

52.50.J 52.77.F 42.62 52.75.D 42.79.A 47.40 

References

  1. 1.
    Bach G.G. and Lee J.H. (1969). Higher-order perturbation solutions for blast waves. AIAA J. 7: 742–744 CrossRefGoogle Scholar
  2. 2.
    Gretler W. (1994). Blast waves in inhomogeneous atmospheres including real gas and heat transfer effects. Fluid Dyn. Res. 14: 191–216 CrossRefGoogle Scholar
  3. 3.
    Katsurayama, H., Ushio, M., Komurasaki, K., Arakawa, Y.: An analytical study on flight performance of a RP laser launcher. Proceedings 3rd International Symposium On Beamed Energy Propulsion, AIP Conference Proceedings, vol. 776, pp. 117–127 (2003)Google Scholar
  4. 4.
    Kompaneets A.S. (1960). A point explosion in an inhomogeneous atmosphere. Sov. Phys. Dokl. 5: 46–48 MATHGoogle Scholar
  5. 5.
    Mori K., Komurasaki K. and Arakawa Y. (2002). Influence of the focusing f-number on heating regime transition in laser absorption waves. J. Appl. Phys. 92(10): 5663–5667 CrossRefGoogle Scholar
  6. 6.
    Mori K., Komurasaki K. and Arakawa Y. (2004). Energy transfer from a laser pulse to a blast wave in reduced-pressure air atmospheres. J. Appl. Phys. 95(11): 5979–5983 CrossRefGoogle Scholar
  7. 7.
    Mori K., Komurasaki K. and Arakawa Y. (2006). Threshold laser power density for regime transition of laser absorption wave in an air atmosphere at reduced densities. Appl. Phys. Lett. 88: 12102 CrossRefGoogle Scholar
  8. 8.
    Myrabo, L.N.: World record flights of beam-riding rocket lightcraft: demonstration of “disruptive” propulsion technology. AIAA Paper 01–3798 (2001)Google Scholar
  9. 9.
    Raizer Y.P. (1977). Laser-Induced Discharge Phenomena, Studies in Soviet Science. Consultants Bureau, New York, pp. 199–206 Google Scholar
  10. 10.
    Radulescu M.I., Higgins A.J., Murray S.B. and Lee J.H.S. (2003). An experimental investigation of the direct initiation of cylindrical detonations. J. Fluid Mech. 480: 1–24 MATHCrossRefGoogle Scholar
  11. 11.
    Sedov L.I. (1959). Similarity and Dimension Methods in Mechanics. Academic Press, New York Google Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Masato Ushio
    • 1
  • Kimiya Komurasaki
    • 1
  • Koichi Kawamura
    • 1
  • Yoshihiro Arakawa
    • 2
  1. 1.Department of Advanced EnergyThe University of TokyoChibaJapan
  2. 2.Department Aeronautics and AstronauticsThe University of TokyoTokyoJapan

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