| 摘要 |
In a two-stroke engine, fresh air introduced through a scavenging port into a combustion chamber becomes an air flow directed to a top surface of a piston and is guided by a concave of the piston top surface to produce an reverse tumble flow. A combustion gas is pushed out through an exhaust port, opened and closed by the piston, in a stratified state by the scavenging flow. In addition, when the exhaust port goes down in the closure condition, a strong tumble flow occurs in the combustion chamber , and at an ignition position(point, location) in the vicinity of the top dead center, the reverse tumble flow runs against a squish developing between the piston top surface and a lower surface of a cylinder head and gathers in the concave in a state disturbed.
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