ディーゼル機関の吸排気系流動損失の研究

概要

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This report gives an account of the tests carried out on steady flow around the valve in the cylinder cover of a high-output medium-speed diesel engine. The effective area ratios of the exhaust and suction valves are obtained for the three types of cylinder cover (Siamese, Semi Siamese, Tandem) and three types of valve cage. The induction swirl in a cylinder was measured using a paddle wheel. The effects of the form of valve and seat-ring on the effective area ratio were tested using the section model of valve. The test results showed that, 1) The effective area ratio (suction and exhaust) is very little affected by the type of the cylinder cover. 2) The suction effective area ratio is affected by the type of valve cage, but the exhaust effective area ratio is little affected by valve cage. 3) The Tandem type cylinder cover causes highest induction swirl in a cylinder, while Siamese type causes lowest. 4) As the results of model tests, the most suitable forms of valve and seatring are obtained.
1974-12-26