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This study was performed to investigate the behavior and spatial distribution of fuel mixtures with different piston cavity wall angles in a chamber. The spatial distribution of fuel mixtures after impingement of a spray against a piston cavity is one of the most important factors for stratification. Thus, it is informative to understand in detail the behavior and spatial distribution of fuel mixtures after impingement in the cavity. Two dimensional spray fluorescence images of liquid and vapor phase were acquired to analyze the behavior and distribution of fuel mixtures inside of chamber by exciplex fluorescence method.
The exciplex system of fluorobenzene and DEMA in non-fluorescing base fuel of hexane was employed. Wall angle of piston cavity was set to 0, 30, 60 and 90 degrees, and three impinging distance were set to 47.6mm, 58.4mm and 70.0mm, relatively, which correspond to the distance between injection tip and piston cavity with change of injection timing in the engine. The spray hit to the cavity and traveled along the cavity wall by its momentum. In the case of θ=30.60 dregees, the rolling-up moved from the impinging location to the round.In the case of θ=90 degrees, the rolling-up recircurated in the cavity and fuel mixture concentrated in the cavity center region. High concentrated fuel vapor phase was observed in the cavity with increasing impingement distance, which ascribed to decrease of spray momentum. Form these results, the effect of angle of piston cavity and impingement distance on spatial distribution and behavior of fuel mixture were demonstrated.

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Abstract

Nomenclature

1.서론

2.실험장치 및 방법

3.실험결과 및 고찰

4.결론

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UCI(KEPA) : I410-ECN-0101-2009-556-014331564