A Study on Combustion in Direct-Injeciton Diesel Engines : 2nd Report, In the Case of Deep-Bowl Chamber

概要

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The mixture formation and combustion in deep-bowl type direct-injection engines have been investigated by means of high-speed photography. This type of combustion chamber is often adopted in compact high-speed engines and may be characterized by squish motions created by piston movement. At first, the effects of the squishs on combustion have been evaluated in several chambers. It has been revealed that a flame rapidly penetrates into the clearance space soon after ignition, assisted by the reversed squishs motion, thereby the flame lasting for a longer period than in the combustion chamber. This implies that a too early outflow of fuel into the clearance space is to be prevented in order to ensure a favorable combustion. Indeed the swirl well removes such an excessive outflow, but at the swirl or a too high intensity the mixture formation in the periphery of the combustion chamber is hampered, thus inviting poorer air utilization in the clearance space.
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