Auto-ignition and DDT driven by shock wave – Boundary layer interaction in oxyhydrogen mixture

Detonation research started just at the beginning of 1880s, but its generation mechanism is still a mystery and has not been explained in details yet. Many experimental research in the early 1900s reported that detonation is generated by a transition from deflagration, later known as deflagration-to...

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Bibliographic Details
Published in:International journal of hydrogen energy 2013-04, Vol.38 (10), p.4185-4193
Main Authors: Dziemińska, Edyta, Hayashi, A. Koichi
Format: Article
Language:English
Subjects:
Applied sciences
Auto-ignition
Boundary layer
Combustion of gaseous fuels
Combustion. Flame
DDT
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fast flame
Shock wave – boundary layer interaction
Theoretical studies. Data and constants. Metering
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Summary:Detonation research started just at the beginning of 1880s, but its generation mechanism is still a mystery and has not been explained in details yet. Many experimental research in the early 1900s reported that detonation is generated by a transition from deflagration, later known as deflagration-to-detonation transition (DDT). A high performance laser allowing to see a detailed phenomenon was developed later. However, even with nowadays experimental techniques a detailed view on detonation initiation cannot be provided. The present work shows for the first time in details that shock wave – boundary layer interactions are the key for an auto-ignition in the boundary layer in a smooth tube. From that process of the auto-ignition a new flame is developed and propagate along the wall with a sound speed, turns into a fast flame, and trigger DDT finally. The most important factors for the process of the auto-ignition in the boundary layer are thermodynamic interactions in the boundary layer and the induction time. ► Shock wave – boundary layer interaction drives an ignition in the boundary layer. ► Thermodynamic interactions and induction time are the most important. ► A new flame is developed from the ignition and propagates along the wall. ► That flame is a fast flame, because its speed is more than the local sound speed. ► We can observe DDT and detonation.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2013.01.111