### Abstract

Self-sustained oblique detonation waves around projectiles were experimentally studied as part of a fundamental investigation of the application of an oblique detonation wave engine and a high-efficiency detonation wave combustor as a power generator. The mean-curvature coefficient was constant and did not depend on the type of fuel mixture (H_{2}/O_{2}/Ar or C_{2}H_{2}/O_{2}/Ar), initial mixture pressure, projectile diameter, projectile velocity, or diluent mole fraction. A more accurate mean-curvature coefficient for stabilized oblique detonation around symmetric spherical bodies in highly krypton-diluted acetylene/oxygen mixtures that have extremely low C-J velocities was observed. A lower-velocity projectile could stabilize a self-sustained oblique detonation wave more effectively than a higher-velocity one, and the attenuation rate depended only on the non-dimensional mean-curvature radius. A mean-curvature coefficient of 7.8 was the first expression of criticality and was the most important value for generating self-sustained oblique detonation stabilized around multidimensional bodies. 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 was proposed, which was the secondary expression of the criticality and identical with present and past experimental results. This is an abstract of a paper presented at the 29th International Symposium on Combustion (Sapporo, Japan 7/21/2002).

Original language | English |
---|---|

Title of host publication | Proceedings of the Combustion Institute |

Editors | J.H. Chen, M.D. Colket |

Pages | 2817-2824 |

Number of pages | 8 |

Volume | 29 II |

Publication status | Published - 2002 |

Event | Twenty-Ninth International Symposium on Combustion - Sapporo, Japan Duration: 2002 Jul 21 → 2002 Jul 25 |

### Other

Other | Twenty-Ninth International Symposium on Combustion |
---|---|

Country | Japan |

City | Sapporo |

Period | 02/7/21 → 02/7/25 |

### Fingerprint

### ASJC Scopus subject areas

- Automotive Engineering

### Cite this

*Proceedings of the Combustion Institute*(Vol. 29 II, pp. 2817-2824)

**Criticality for stabilized oblique detonation waves around spherical 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

*Proceedings of the Combustion Institute.*vol. 29 II, pp. 2817-2824, Twenty-Ninth International Symposium on Combustion, Sapporo, Japan, 02/7/21.

}

TY - GEN

T1 - Criticality for stabilized oblique detonation waves around spherical 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 - Self-sustained oblique detonation waves around projectiles were experimentally studied as part of a fundamental investigation of the application of an oblique detonation wave engine and a high-efficiency detonation wave combustor as a power generator. The mean-curvature coefficient was constant and did not depend on the type of fuel mixture (H2/O2/Ar or C2H2/O2/Ar), initial mixture pressure, projectile diameter, projectile velocity, or diluent mole fraction. A more accurate mean-curvature coefficient for stabilized oblique detonation around symmetric spherical bodies in highly krypton-diluted acetylene/oxygen mixtures that have extremely low C-J velocities was observed. A lower-velocity projectile could stabilize a self-sustained oblique detonation wave more effectively than a higher-velocity one, and the attenuation rate depended only on the non-dimensional mean-curvature radius. A mean-curvature coefficient of 7.8 was the first expression of criticality and was the most important value for generating self-sustained oblique detonation stabilized around multidimensional bodies. 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 was proposed, which was the secondary expression of the criticality and identical with present and past experimental results. This is an abstract of a paper presented at the 29th International Symposium on Combustion (Sapporo, Japan 7/21/2002).

AB - Self-sustained oblique detonation waves around projectiles were experimentally studied as part of a fundamental investigation of the application of an oblique detonation wave engine and a high-efficiency detonation wave combustor as a power generator. The mean-curvature coefficient was constant and did not depend on the type of fuel mixture (H2/O2/Ar or C2H2/O2/Ar), initial mixture pressure, projectile diameter, projectile velocity, or diluent mole fraction. A more accurate mean-curvature coefficient for stabilized oblique detonation around symmetric spherical bodies in highly krypton-diluted acetylene/oxygen mixtures that have extremely low C-J velocities was observed. A lower-velocity projectile could stabilize a self-sustained oblique detonation wave more effectively than a higher-velocity one, and the attenuation rate depended only on the non-dimensional mean-curvature radius. A mean-curvature coefficient of 7.8 was the first expression of criticality and was the most important value for generating self-sustained oblique detonation stabilized around multidimensional bodies. 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 was proposed, which was the secondary expression of the criticality and identical with present and past experimental results. This is an abstract of a paper presented at the 29th International Symposium on Combustion (Sapporo, Japan 7/21/2002).

UR - http://www.scopus.com/inward/record.url?scp=0038156293&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038156293&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0038156293

VL - 29 II

SP - 2817

EP - 2824

BT - Proceedings of the Combustion Institute

A2 - Chen, J.H.

A2 - Colket, M.D.

ER -