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７報　点火プラグ近傍における時間的変動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. 7th Report. Ensemble-Averaged Concentration Fluctuation and Cyclic Variation of Temporal Concentration Fluctuation 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 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 could be split into three components; 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 concentration fluctuation and the cyclic variation of temporal concentration fluctuation. The results show that the cyclic variation of temporal concentration fluctuation was too large to be neglected, and both the ensemble-averaged concentration fluctuation and the cyclic variation of temporal concentration fluctuation increased and reached a peak after which they decreased during the intake and compression strokes. They were strongly affected by the air fuel ratio, engine speed, injection duration and injection timing.

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