Abstract

A single cylinder engine with the combustion chamber mounted on the piston was designed to allow visualization in the direction of the cylinder axis. By using this engine, the evaporating process of the fuel injected into the combustion chamber was observed. High speed Schlieren, shadowgraph, and back-illuminated movies were taken for detailed observation of the combustion chambers with a single hole injector and a swirl injector which have different injection characteristics. The one with a single hole injector shows strong collision of the spray with the bottom of the chamber and fast evaporation. Another with a swirl injector shows no trace of such collision and relatively slow evaporation.

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