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Вариант №4 I. Перевести текст: There are four main types of marine engine: the diesel engine, the steam turbine, the gas turbine and the marine nucle
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- 2021 год
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Вариант №4
I. Перевести текст:
There are four main types of marine engine: the diesel engine, the steam turbine, the gas turbine and the marine nuclear plant.
The diesel engine is a form of internal combustion engine. Its power is expressed as brake horsepower (bhp). This is the power put out by engine. Effective horsepower is the power developed by the piston in the cylinder, but some of this is lost by friction within the engine. The power is now expressed in kilowatts. Large diesel engines, which have cylinder nearly 900 mm in diameter, turn at the relatively slow speed of about 145 rpm and less. They are known as slow-speed diesel engines. They can be connected directly to the propeller without gearing. Although higher power could be produced by higher revolutions, this would reduce the efficiency of the propeller, because the propeller is more efficient the larger it is and the slower it turns. More and more of the larger merchant vessels are being powered by medium-speed diesel engines. These operate between 150 and 450 rpm, therefore they are connected to the propeller by gearing. They cheaper thanslow-speed diesel engines and their smaller size and weight can result in a smaller cheaper ship.
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