レイリー散乱法による火花点火機関燃焼室内混合気濃度の測定　第６報　点火プラグ近傍における時間平均濃度のアンサンブル平均値とサイクル変動値

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  • Mixture Strength Measurements in the Combustion Chamber of SI Engine via Rayleigh Scattering. 6th Report. Ensemble-Averaged Mean Concentration and Cyclic Variation of Temporal Mean Concentration near the Spark Plug.
  • レイリー サンランホウ ニ ヨル ヒバナ テンカ キカン ネンショウシツナイ

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Laser Rayleigh scattering was applied for the remote, nonintrusive point probing of the fuel vapor concentration and its fluctuation near the spark plug of a motored spark ignition engine, which was caused by the intermittent injection of Freon-12 vapor into an intake port. The theoretical analysis showed that the instantaneous fuel vapor concentration can be split into three components which were the ensemble-averaged mean concentration, the cyclic variation of temporal mean concentration and the temporal concentration fluctuation in a specific cycle. This paper concentrates on the measurements of the ensemble-averaged mean concentration and the cyclic variation of temporal mean concentration. The results show that both the ensemble-averaged mean concentration and the cyclic variation of temporal mean concentration increased and reached a peak, after which they decreased during the intake and compression strokes. Moreover, they were strongly affected by the air fuel ratio, engine speed, injection duration and injection timing.

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