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The re-initiation mechanism of detonation diffraction in a weakly unstable gaseous mixture

Published online by Cambridge University Press:  21 May 2020

Lisong Shi Open the ORCID record for Lisong Shi [Opens in a new window] ,
Ken Chun Kit Uy  and
Chih Yung Wen Open the ORCID record for Chih Yung Wen [Opens in a new window]
Lisong Shi
Affiliation:
Department of Mechanical Engineering and Interdisplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Ken Chun Kit Uy
Affiliation:
Department of Mechanical Engineering and Interdisplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Chih Yung Wen*
Affiliation:
Department of Mechanical Engineering and Interdisplinary Division of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
*
†Email address for correspondence: cywen@polyu.edu.hk
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Abstract

Numerical simulations were performed to investigate the re-initiation mechanism of a diffracted detonation wave near the critical channel width for a weakly unstable gas. Two scenarios were examined: diffraction of a planar detonation wave and of a cellular detonation wave inside the inlet channel. The results revealed that the critical channel width predicted using a cellular detonation wave is smaller than that predicted using a planar detonation wave. The re-initiation mechanisms are described in detail by tracing massless particles along both the plane of symmetry and the re-initiation path. For planar detonation diffractions, a compression wave is formed in the far field behind the diffracted shock. Re-initiation is closely related to the amplification of this compression wave and its coalescence with the diffracted shock. Depending on the inlet channel width, the strength of the reflected rarefaction wave is responsible for weakening the strength of the compression wave and its coalescence with the diffracted shock, consequently hindering the reaction of particles behind the diffracted shock wave. In cellular cases, the continuous collisions of transverse waves, which generate local explosion sites, sustain detonation wave propagation.

JFM classification

Compressible Flows: Detonation waves
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 895 , 25 July 2020 , A24
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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