Starting Aid by an Automatic Decompression Valve in a Two Stroke Cycle Diesel Engine

概要

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In the previous papers the temperature rise due to throttling was applied as a starting aid for a four stroke cycle diesel engine and a crankcase scavenged two stroke cycle diesel engine. In the present paper the same process has been applied to a two stroke cycle diesel engine with a scavenging blower. By releasing the cylinder pressure on the compression stroke with an automatic valve, pressure drop under the ambient can be obtained at the end of an expansion stroke. When the exhaust ports open, the air rushes into the cylinder with a considerable temperature rise. After scavenging, the charge temperature is lowerd, being, however, higher than the scavenge air temperature at the beginning of compression. The calculated temperature rise reached 80℃ before scavenging. However, when the delivery ratio was unity in the scavenging process, it was reduced to 24℃ at the beginning of compression, while the observed one was 19℃. In the starting test the minimum cooling water temperature at which the engine can start can be lowered by 30℃ in the range of small delivery ratio.
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