Cyclic Variation of Heat Flux on Spark Plug.

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  • 点火プラグ部の熱流束変動の測定
  • テンカ プラグブ ノ ネツ リュウソク ヘンドウ ノ ソクテイ

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Abstract

This paper examines the relationship between the magnitude of the heat flux to the spark plug ground electrode, averaged over an 80° crank angle (CA) of early compression stroke, and the initial burning rate, defined as the CA at which 5% of mass is burned. The heat flux was measured by a thin-film thermocouple with the hot junction on the surface of ground electrode. The results demonstrate that faster initial burning rate correlated well with increasing heat flux from the spark plug to the mixture. The difference in the magnitude and direction of the heat flux is associated with the amount of residual gas concentration and thus the results show the effect of residual gas concentration. The cycle-averaged heat flux from the hot junction is 0.367 MW/m2, corresponding to a total heat flow of 20 W from the total surface area of ground electrode. This value is about an order of magnitude larger than that previously reported in the literature for locations away from the spark plug, e.g. at the cylinder wall.

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