内燃機関燃焼促進のための極短時間パルスDBD放電構造解析とエネルギー効率評価

概要

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A detailed computational simulations of a nano-second pulse DBD (Dielectric Barrier Discharge) streamer in lean methane-air mixture at pressure of 3 atm and temperature of 500 K were conducted for plasma assisted combustion. The DBD streamer propagation process with radical production has been clarified. The radicals are produced mostly at the streamer head with high electric field. The oxygen radical number density is the highest, followed by nitrogen radical, hydrogen radical and CH3 radical. The coupled energy increases more rapidly with applied voltage compared with oxygen radical number density, therefore, there exists the optimum operating voltage for oxygen radical production efficiency. Furthermore, the ignition delay time in lean premixed methane/air improves by nano-second pulse DBD discharge with applied voltage even at high pressure and high temperature conditions.