### 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 (H_{2}-O_{2}-Ar or C_{2}H_{2}-O_{2}-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 language | English |
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Title of host publication | International Symposium on Combustion Abstracts of Accepted Papers |

Pages | 27 |

Number of pages | 1 |

Publication status | Published - 2002 |

Externally published | Yes |

Event | 29th International Symposium on Combustion - Sapporo, Japan Duration: 2002 Jul 21 → 2002 Jul 26 |

### Other

Other | 29th International Symposium on Combustion |
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Country | Japan |

City | Sapporo |

Period | 02/7/21 → 02/7/26 |

### Fingerprint

### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*International Symposium on Combustion Abstracts of Accepted Papers*(pp. 27)

**Criticality for stabilized Chapman-Jouguet oblique detonation wave around sphere bodies in acetylene-oxygen-krypton mixtures.** / Kasahara, Jiro; Arai, Takakage; Chiba, Shingo; Takazawa, Kouki; Tanahashi, Yu; Matsuo, Akiko.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*International Symposium on Combustion Abstracts of Accepted Papers.*pp. 27, 29th International Symposium on Combustion, Sapporo, Japan, 02/7/21.

}

TY - GEN

T1 - Criticality for stabilized Chapman-Jouguet oblique detonation wave around sphere bodies in acetylene-oxygen-krypton mixtures

AU - Kasahara, Jiro

AU - Arai, Takakage

AU - Chiba, Shingo

AU - Takazawa, Kouki

AU - Tanahashi, Yu

AU - Matsuo, Akiko

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0036930601&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036930601&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0036930601

SP - 27

BT - International Symposium on Combustion Abstracts of Accepted Papers

ER -