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Что такое дизельный двигатель. Написание аннотации к тексту. Diesel engine
Diesel engines are a class of internal combustion engine in which the fuel is burned internally and the combustion products are used as the working fluid. Unlike the spark-ignited (SI) engines found in the majority of today's automobiles in which the premixed fuel-air mixture is ignited by an electric spark, diesel engines are characterized by a spontaneously initiated combustion process where the ignition is brought about by very high temperature compressed air. A small amount of diesel fuel is injected at the end of the compression stroke into the cylinder where the fuel auto-ignites. Because of their higher actual operating efficiencies, as compared with SI engines that require pre-ignition, diesel engines are primarily used in heavy-duty vehicles such as trucks, ships, locomotives, etc.
Diesel engines were first developed by Rudolf Diesel (1858-1913) in the late nineteenth century. The original concept was to build a multifuel engine and to use coal as a primary fuel. However, for some reason, coal-fueled diesel engines so far have gained only occasional interest from the industry (e.g., when fuel-oil prices are high), most of the diesel engines currently being used rely on petroleum fuels. They are four-stroke cycle engines, and operate from several hundred up to around one thousand rpm. In addition to pistons, cylinders, crankshaft, and various valves, diesel engines are also equipped with controlled fuel injection systems, exhaust systems, cooling systems, and so on. Sufficient lubrication is required to prevent excessive wear of various parts in engines. Since pre-ignition is not required, the compression step can be continued to reach a higher pressure or a higher compression ratio than that in SI engines. This results in compressed air with a temperature exceeding the ignition point of the injected fuel for auto-ignition. To achieve high combustion efficiency, the fuel jets must draw in and mix well with air, ignite, and burn, all within less than one millisecond, when they impact on the cold combustion chamber walls. Engine performance is closely related to compression ratio, piston speed, supercharging, turbo-charging, etc., and engine size is normally in terms of power rating (i.e., horsepower; for instance, 20,000 hp applicable for ship propulsion). In principle, the same engine frame can be designed for different output by varying the number of cylinders (10, 12, 16 cylinders, and so on).

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zakopirinina
zakopirinina
4,7(56 оценок)

multifuel engine это дизельный двигатель , я вопрос не очень поняла, напиши по понятней и я отвечу.!

Объяснение:

01029283736463637
01029283736463637
4,5(96 оценок)
1)my peers dream of different professions. many associate their future with the legal profession, economists. and i would like to be a writer.reflecting on the stories and novels written many decades ago, amazed at how writers could see through the centuries, we see that their ideas of belonging to our time.i guess i'll write and romantic and comic works.i want to make the hearts of people who read my work, filled the hearts of people with warmth, love, and helped them to understand the essence of being. the writer can soothe the soul disturbing the reader, and can conversely, to excite people's feelings bright, emotional coloring of his works. as pushkin rightly pointedhow long will i have the kind people,what i'm feeling good lyre has prompted i understand that before becoming a writer, i have a lot to learn, i must have a certain level of culture, to know literature, language and history. i have a dream - to be a writer. and i will try to achieve it.тут ще одно на вибір)2)i am in the 7 "a" grade in secondary school no. 1 in the orenburg region in the village akbulak. i am 13 years old. i thought, and decided to tell what could be with me in 2020. and that`s what i thought.

in 2020, perhaps i will live in the capital of our country, moscow. probably find new friends, but also with old friends, too, will communicate. i hope to get higher education. another thing i would like to get a prestigious job, which i can earn money, and if the earnings will be good, i hope i can help my country and people in need. i buy myself a steep car, nice big house. i think so, because now i`m learning well in school, play sport, wear stylish and fashionable clothes, i was popular in society, have been receiving a small income on the internet. and in 2020 i hope to stay in the same smart, sporty and popular in society. if i stay the same then i can support my family and myself, i will always be a lot of wonderful friends. maybe i will become a famous athlete or a famous television presenter, or will work in sprouted policy.

i certainly want to be the way i describe myself now, because it is very healthy and beautiful!

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