Three-dimensional numerical simulation of detonations in coaxial tubes |
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| Authors: | Nobuyuki Tsuboi Yu Daimon A Koichi Hayashi |
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| Institution: | (1) Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan;(2) Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510, Japan;(3) Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan |
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| Abstract: | Three-dimensional numerical simulation of detonations in both a circular tube and a coaxial tube are simulated to reveal characteristics
of single spinning and two-headed detonations. The numerical results show a feature of a single spinning detonation which
was discovered in 1926. Transverse detonations are observed in both tubes, however, the single spinning mode maintains the
complex Mach reflection whereas the two-headed mode develops periodically from the single Mach reflection to the complex one.
The calculated cell aspect ratio for the two-headed mode changes from 1.09 to 1.34 as the radius of axial insert increases
from r
1/R = 0.1 to 0.9. The calculated cell aspect ratio for r
1/R = 0.1 is close to the experimental results without an axial insert. The formation of an unreacted gas pocket behind the detonation
front was not observed in the single spinning mode; however, the two-headed mode has unreacted gas pocket behind the front
near the axial insert.
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| Keywords: | Gaseous detonation Numerical simulation Spinning detonation Two-headed detonation |
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