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The power of two-stroke engine is influenced by the scavenging efficiency. Matching in-cylinder swirl ratio for injection system is indispensable. It is important to get low scavenging pressure to decrease mechanical power loss. This paper describes the effect of the scavenging ports configuration to the swirl ratio, the scavenging efficiency and the scavenging pressure, in case of uniflow scavenging two-stroke diesel engine that has four exhaust valves and the cylinder liner with scavenging ports. Especially we researched the relative advantages and disadvantages of shape factors using case-study by in-cylinder computational fluid dynamics simulation.

Multi-dimensional transient scavenging flow simulation of a schnule scavenged two-stroke cycle engine has been carried out under motoring conditions. This paper presents the differences of the flow characteristics between crankcase compression and roots blower scavenging, obtained by different initial and boundary conditions of scavenging pressure. Furthermore, the influence of scavenging port's slant angle are shown by using the CFD visualization technique.