Abstract
The paper deals with a new method of measuring the scavenging efficiency in a loop-scavenged two-stroke cycle diesel engine and its assessment on a test engine. The two valves installed on the cylinder head are to be timely opened by the overhead cam shaft driven at half an engine speed, and to extract the gases of the same cycle before and after the scavenging, giving the possibility of determining either the scavenging efficiency when the engine is operated as fourstroke cycle, or the trapping efficiency when done as two-stroke cycle. The experments employing this apparatus revealed a great deal of valuable information for improving the scavenging system, and also indicated that the scavenging efficiency in a well-designed cylinder could reach over 90% at a delivery ratio of 1.3∼1.4, which does not seem to be inferior to that obtained in the uniflow scavenged system.
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