Characteristics of shock-induced combustion around hypersonic cylindrical projectiles into combustible gases

Y. Kamiyama, Akiko Matsuo

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

1 Citation (Scopus)

Abstract

Shock-induced combustion around a cylindrical projectile is numerically studied. A simplified two-step chemical reaction model is used to handle the reactions instead of realistic elementally chemical reactions. The simulations are examined with various parameters, such as projectile speed, initial pressure, projectile diameter and activation energy E1/R in the simplified chemical model, and the unsteady mode of the large-disturbance regime, whose oscillations are less regular and low in frequency, appears in all of simulation results. The oscillation periods normalized by the induction time tind for the large-disturbance regime well agree with the previous experimental and numerical observations around the spherical projectile. The histories on the stagnation streamline give us the detailed oscillation mechanism with the interaction of the bow shock and the reaction front, and the unsteadiness shows different features depending on the experimental conditions. Those results with various parameters also'revealed the characteristic relation between non-dimensional oscillation period tltind and non-dimensional diameter dllind. t/tind of large-disturbance regime always shows proportional relation to d/lind Thus, it is found that the non-dimensional diameter d/lind is the key factor to determine the oscillation period, and allows us to predict the oscillation periods by an arbitrary experimental condition.

Original languageEnglish
Title of host publication40th AIAA Aerospace Sciences Meeting and Exhibit
Publication statusPublished - 2002
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: 2002 Jan 142002 Jan 17

Other

Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
CountryUnited States
CityReno, NV
Period02/1/1402/1/17

Fingerprint

hypersonics
Hypersonic aerodynamics
Projectiles
projectiles
combustion
shock
oscillation
oscillations
Gases
gases
gas
Chemical reactions
disturbances
disturbance
chemical reaction
chemical reactions
Activation energy
bows
activation energy
simulation

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Characteristics of shock-induced combustion around hypersonic cylindrical projectiles into combustible gases. / Kamiyama, Y.; Matsuo, Akiko.

40th AIAA Aerospace Sciences Meeting and Exhibit. 2002.

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

Kamiyama, Y & Matsuo, A 2002, Characteristics of shock-induced combustion around hypersonic cylindrical projectiles into combustible gases. in 40th AIAA Aerospace Sciences Meeting and Exhibit. 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States, 02/1/14.
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AB - Shock-induced combustion around a cylindrical projectile is numerically studied. A simplified two-step chemical reaction model is used to handle the reactions instead of realistic elementally chemical reactions. The simulations are examined with various parameters, such as projectile speed, initial pressure, projectile diameter and activation energy E1/R in the simplified chemical model, and the unsteady mode of the large-disturbance regime, whose oscillations are less regular and low in frequency, appears in all of simulation results. The oscillation periods normalized by the induction time tind for the large-disturbance regime well agree with the previous experimental and numerical observations around the spherical projectile. The histories on the stagnation streamline give us the detailed oscillation mechanism with the interaction of the bow shock and the reaction front, and the unsteadiness shows different features depending on the experimental conditions. Those results with various parameters also'revealed the characteristic relation between non-dimensional oscillation period tltind and non-dimensional diameter dllind. t/tind of large-disturbance regime always shows proportional relation to d/lind Thus, it is found that the non-dimensional diameter d/lind is the key factor to determine the oscillation period, and allows us to predict the oscillation periods by an arbitrary experimental condition.

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