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Breakdown plasma and vortex flow control for laser ignition using a combination of nano- and femto-second lasers

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Abstract

The breakdown plasma and successive flow leading to combustion are controlled by the combination of a nano-second Nd:YAG laser and a femto-second Ti:Sapphire (TiS) laser. The behaviors are captured by an intensified charged coupled device (ICCD) camera and a high-speed schlieren optical system. The TiS laser determines the initial position of the breakdown by supplying the initial electrons in the optical axis of focusing YAG laser pulses. We show that the initial position of the breakdown can be controlled by the incident position of the TiS laser. In addition, the ignition lean limit of the flammable mixture changes depending on the TiS laser incident position, which is influenced by hot gas distribution and the flow in the flame kernel.

© 2013 Optical Society of America

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Figures (7)

Fig. 1
Fig. 1 Optical arrangement
Fig. 2
Fig. 2 Breakdown threshold energy of air at different pressures
Fig. 3
Fig. 3 Relation between incident energy Ein and absorption of YAG laser pulse Eab
Fig. 4
Fig. 4 Plasma visualization images by ultra-high-speed ICCD camera
Fig. 5
Fig. 5 High-speed schlieren images (Each image set is the same shot as Fig. 4)
Fig. 6
Fig. 6 Results of ignition tests in CH4-air lean mixture. ‘○’ shows successful ignition and ‘×’ shows misfire.
Fig. 7
Fig. 7 The average and standard deviation of the maximum values of the pressure rise, and σp in CH4-air mixture.
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