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Ignition characteristics of methane/air premixed mixture by microwave-enhanced laser-induced breakdown plasma

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Abstract

A microwave-enhanced plasma generation technique was combined with laser-induced ignition to improve ignition characteristics. A locally intensified microwave field was formed near the laser-induced breakdown plasma. As the plasma absorbed the microwaves, the plasma emission intensity increased. The plasma lifetime could be controlled by changing the microwave oscillation duration. Furthermore, the microwave-enhanced laser-induced breakdown plasma improved the minimum ignition energy of the methane/air pre-mixture with just a small amount of absorbed microwave energy.

© 2013 Optical Society of America

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Figures (8)

Fig. 1
Fig. 1 Schematic diagram of experimental setup
Fig. 2
Fig. 2 Schematic diagram of microwave system and antenna
Fig. 3
Fig. 3 Plasma emission intensity at 308 nm with and without microwave enhancement. (a) Whole duration of microwave oscillation. (b) Just after breakdown (t = 0~50 μs).
Fig. 4
Fig. 4 High speed images of microwave enhanced laser-induced breakdown
Fig. 5
Fig. 5 Plasma emission intensity and microwave power. (a) Input and reflection microwave power. (b) Absorbed microwave power by plasma.
Fig. 6
Fig. 6 Breakdown threshold level and minimum ignition energy without microwave condition
Fig. 7
Fig. 7 Relationship between microwave oscillation and ignition success rate. (a) Microwave oscillation duration. (b) Microwave absorbed energy.
Fig. 8
Fig. 8 Minimum ignition energy improvement by microwave enhanced laser-induced breakdown plasma
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