日本燃焼学会誌
Online ISSN : 2424-1687
Print ISSN : 1347-1864
ISSN-L : 1347-1864
連載講座 —燃焼におけるプラズマ利用の新展開 I
レーザーブレイクダウン支援長距離放電点火
髙橋 栄一秋濱 一弘
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2022 年 64 巻 207 号 p. 65-73

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To improve the thermal efficiency of internal combustion engines, the achievement of volumetric ignition by discharge plasmas is one of the key issue. A very long gap discharge provides the ideal discharge ignition with small heat loss to electrodes, high energy coupling efficiency from power supply to discharge plasma, and suppression of re-strike discharge in flow environment. It is, however, difficult to realize the long discharge because the applicable voltage is practically restricted by the dielectric and/or surface breakdown of insulating material. New ignition method was proposed based on the possibility to reduce the discharge threshold voltage by supplying an initial charge between the electrodes with a laser. This paper outlines the new technology named Laser Breakdown Assisted Long-Discharge Ignition (LBALDI) used for ignition by forming a long-distance discharge assisted by laser breakdown plasma, expanding the lean and rich ignition limits, suppressing re-strike discharge in flow environment, and improved ignition performance under high pressure environment.

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