17 April 2001 Interaction between a flame kernel and a shock wave generated by spark discharge
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Proceedings Volume 4183, 24th International Congress on High-Speed Photography and Photonics; (2001); doi: 10.1117/12.424331
Event: 24th International Congress on High-Speed Photography and Photonics, 2000, Sendai, Japan
Abstract
In the present work, interaction of flame kernels with shock waves generated by spark discharge has been studied using a plane or a cylindrical shock wave reflector fixed to a combustion chamber. The ignition unit was designed to produce capacitance sparks whose duration was less than 1 microsecond. Schlieren photographs show that the flame kernel development with the cylindrical reflector is initially suppressed by shock-flame interaction. Afterwards the surface area of the flame kernel with the cylindrical reflector exceeds that without reflector. This result is also confirmed in the experimental results on ignition probabilities obtained from measurement of OH radiation emitted by the flame kernel. As for the plane reflector, flame kernel development is promoted in particular for reflectors placed close to the spark gap. The calculated pressure and temperature profiles explain the shock suppression for the cylindrical reflector.
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Kazuhiro Ishii, H. Shimomura, T. Tsuboi, "Interaction between a flame kernel and a shock wave generated by spark discharge", Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); doi: 10.1117/12.424331; https://doi.org/10.1117/12.424331
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KEYWORDS
Reflectors

Combustion

Photography

Capacitance

Spherical lenses

Wave propagation

Electrodes

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