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 language | English |
|---|---|
| Title of host publication | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition |
| DOIs | |
| Publication status | Published - 2012 |
| Event | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States Duration: 2012 Jan 9 → 2012 Jan 12 |
Other
| Other | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition |
|---|---|
| Country | United States |
| City | Nashville, TN |
| Period | 12/1/9 → 12/1/12 |
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ASJC Scopus subject areas
- Aerospace Engineering
Cite this
Front shock behavior of stable detonation waves propagating through rectangular cross-section curved channels. / Nakayama, Hisahiro; Moriya, Takahiro; Kasahara, Jiro; Matsuo, Akiko; Funaki, Ikkoh.
50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. 2012. AIAA 2012-0618.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Front shock behavior of stable detonation waves propagating through rectangular cross-section curved channels
AU - Nakayama, Hisahiro
AU - Moriya, Takahiro
AU - Kasahara, Jiro
AU - Matsuo, Akiko
AU - Funaki, Ikkoh
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
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U2 - 10.2514/6.2012-618
DO - 10.2514/6.2012-618
M3 - Conference contribution
BT - 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
ER -