三菱神戸スルザー7RASD76機関について
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概要
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In this paper is reported the two cycle supercharged diesel engine, 7RSAD76, constructed by the Kobe Shipyard & Engine Works of Mitsubishi Heavy-Industries, Reorg., Ltd. The engine has seven cylinders and develops 10,000 BHP at 121 RPM. Its fuel consumption is about 154.5 and 156.5 gr/BHP/hr at 75 to 85% of full power and at full load, respectively. Accordingly it is concluded that the engine output is increased by about 50% and the fuel consumption is considerably decreased compared with the unsupercharged engines. It is infered from the shop test conducted in the shipyard that the engine would be able to develop about 5,000 BHP, should one of the chargers go wrong, and further about 3,000 BHP even in the case of trouble of all the chargers. The air, which is designed to be drawn into the underside of each piston when all of the chargers are defective, can be used as scavenging air as it is compressed by piston motion, and such feature in the design enables the engine to keep continuous running without chargers. The engine has many special features beside the above one. Starting and accelerating of the engine are so smooth and easy that its manoeuvering is as easy as that of the unsupercharged engines. The result of the shop test shows that the temperatures of the piston and liner are about the same with those of unsupercharged engine, proving its perfect durability. Further, the mechanical efficiency of the engine is remarkably high owing to a scavenging system with the scavenging and exhaust ports fitted with oscillating valves, and its dismantling and overhauling can be done as easily as those of unsupercharged engines, because the chargers are fitted at the middle stage of the engine. Welding minimizes the weight of the engine with no harm on the rigidity of the construction to be required. It must be noted that the engine is designed especially for burning bunker oil.
- 社団法人日本船舶海洋工学会の論文
- 1957-03-30