"Internal Combustion Engine" Internal Energy and Heat Engine PPT Courseware

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"Internal Combustion Engine" Internal Energy and Heat Engine PPT Courseware

1. Heat engine

A device that converts _____ released when fuel is burned into _____ is called a heat engine. A heat engine in which fuel is burned directly in the engine cylinder to produce power is called _____. The most common of these are _____ for cars and _____ for tractors.

2. Gasoline engine

1. Structure: As shown in the figure.

2. Principle: When a gasoline engine is working, a working cycle includes ________ stroke, ________ stroke, ________ stroke and ________ stroke. During the compression stroke, ________ can be converted into ________; during the power stroke, _________ can be converted into ________.

3. Application: Used as power device on ________, low-speed aircraft and some lightweight machinery.

3. Diesel engine

1. Structure: The main difference from the gasoline engine is that the ______ on the top of the cylinder is replaced by ______.

2. Principle: The main difference between the working process of a four-stroke diesel engine and that of a gasoline engine is: ① Only ______ is sucked into the cylinder during the suction stroke; ② During the compression stroke, the gas in the cylinder is compressed to a greater extent than that of a gasoline engine, so the temperature is higher. The pressure is greater; ③At the end of the compression stroke, the injector sprays out mist diesel for ______ ignition.

3. Application: Mostly used in trucks, ______, ships, tractors, etc.

Working process of gasoline engine

1. A working cycle: consists of four strokes: suction, compression, power and exhaust.

2. The main functions of the four strokes are: ① Suction stroke: sucking the fuel mixture composed of gasoline and air into the cylinder. ②Compression stroke: Convert the mechanical energy of the piston into the internal energy of the fuel, causing the internal energy of the fuel mixture to increase, the temperature to increase, and the pressure to increase. ③Power stroke: The internal energy of the gas is converted into the mechanical energy of the piston. ④Exhaust stroke: Exhaust exhaust gas from the cylinder.

3. In one working cycle of a gasoline engine, the piston reciprocates twice, performs one external work, and the crankshaft and flywheel rotate two times.

[Example] Modern cars have entered many homes. The picture below shows the working diagram of a four-stroke gasoline engine cylinder. It is arranged in the order of suction, compression, power and exhaust. The correct order below is ()

A. B, A, C and D. B. A, D, B and C.

C. C. B. A. D. C. D. A. B

Dial: By observing and comparing the closing conditions of the two valves and the movement trend of the piston in the cylinder, you can distinguish which stroke it is.

Knowledge Points Internal Combustion Engine

1. The working energy of the internal combustion engine essentially comes from ()

A. Mechanical energy B. Internal energy C. Electrical energy D. Chemical energy

2. We know that most gasoline engines work continuously through a continuous cycle of four strokes: suction, compression, power, and exhaust. Regarding the function of compression stroke, which of the following statements is correct ()

A. Discharge the exhaust gas out of the cylinder

B. Complete external work

C. Inhale a mixture of gasoline and air

D. Compressed fuel and air mixture

3. As shown in the figure, one stroke in the working cycle of a four-stroke internal combustion engine is ()

A. Compression stroke, converting internal energy into mechanical energy

B. Compression stroke, converting mechanical energy into internal energy

C. Power stroke, converting internal energy into mechanical energy

D. Power stroke, converting mechanical energy into internal energy

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For more information about the PPT courseware "Internal Energy and Heat Engine Internal Combustion Engine", please click the Internal Energy and Heat Engine ppt Internal Combustion Engine ppt tag.

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Update Time: 2024-10-19

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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