People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition Ninth Grade Physics
Shanghai Science Edition 8th Grade Physics
Lu Jiao Edition Ninth Grade Physics Volume 2
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University eighth grade physics volume one
Lu Ke Edition High School Physics Compulsory Course One
Beijing Normal University Ninth Grade Physics Volume 1
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
People's Education Press High School Physics Compulsory Course II
Lu Jiao Edition Eighth Grade Physics Volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao edition eighth grade physics volume 1
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
Category | Format | Size |
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Shanghai Science Edition Ninth Grade Physics | pptx | 6 MB |
Description
"Internal Combustion Engine" Internal Energy and Heat Engine PPT Courseware 3
The steam engine brought a revolution! The first industrial revolution!
Hot steam provides us with powerful thrust, liberating people from heavy manual labor.
The world's first steam engine was a steam ball invented by the ancient Greek mathematician Hero in the 1st century, but it was nothing more than a toy.
Inspired by his predecessors, Watt made a series of major improvements to the steam engine, which were widely used in industry. He ushered in a new era of energy utilization for mankind and marked the beginning of the Industrial Revolution.
In fact, Watt invented the steam engine by observing the water in the kettle boiling and pushing the lid. It was a well-intentioned fabrication.
think about it
What can be used to replace high temperature and high pressure water vapor? That way, the boiler can be dispensed with!
Classification of internal combustion engines
Internal combustion engines are divided into two categories: gasoline engines and diesel engines
Those that use gasoline as fuel are called gasoline engines.
A diesel engine that uses diesel as fuel is called a diesel engine.
1. Principle of heat engine
As shown in the picture, put some water in a test tube, plug it with a rubber stopper, and heat it to boil the water. What will happen?
How is energy transformed during this process?
Phenomenon: the cork breaks out; "white steam" is produced at the mouth of the tube
Explanation: Water vapor does work on the cork, its internal energy decreases, its temperature drops, and the water vapor liquefies into small water droplets.
Energy conversion:
The chemical energy of the fuel is converted into internal energy - water vapor - the internal energy is converted into mechanical energy - enabling the machinery to gain power.
Application: Heat engine (machinery that converts internal energy into mechanical energy)
2. Working principle:
A few nouns:
1. A stroke: When the piston reciprocates in the cylinder, it moves from one end of the cylinder to the other end.
2. A working cycle: These four strokes are called a working cycle of the engine.
suction stroke
______Open close. The piston moves from ______ to ______, and the fuel mixture consisting of gasoline and air is sucked into the cylinder from the intake valve.
Compression stroke
Both the intake valve and the exhaust valve ______, the piston moves toward ______, the fuel mixture is compressed, ______ increases, and ______ increases the mechanical energy and converts it into ______.
power stroke
At the end of the compression stroke, _______ generates an electric spark, causing the fuel to burn violently, producing high-temperature and high-pressure gas, pushing the piston to move _______, and driving the crankshaft to rotate through the connecting rod. Internal energy is converted into _______.
practice
1. A working cycle has ___ strokes. The flywheel rotates ___ times, performs external work ___ times, and the piston reciprocates ___ times. The other strokes are completed by the inertia of the flywheel.
2. Among the four strokes of a gasoline engine, the stroke with the largest internal energy is __________. The stroke with the smallest internal energy is __________.
3. During a certain stroke of a gasoline engine, both the intake valve and the exhaust valve are closed, and the piston moves upward. This stroke is ( )
A. Suction stroke B. Compression stroke
C.Power stroke D.Exhaust stroke
4. In a four-stroke gasoline engine, the ( ) stroke converts mechanical energy into internal energy, and the power stroke converts ( ) energy into ( ) energy.
5. During a certain stroke of a gasoline engine, the intake valve opens, the exhaust valve closes, and the piston moves downward. This stroke is ( )
A. Suction stroke B. Compression stroke
C.Power stroke D.Exhaust stroke
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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.
"Internal Combustion Engine" Internal Energy and Heat Engine PPT Courseware 2:
"Internal Combustion Engine" Internal Energy and Heat Engine PPT Courseware 2 Internal Combustion Engine Cars are an indispensable means of transportation in our lives, and the engine in a car is a type of internal combustion engine. Because it is a device that converts the internal energy generated by fuel combustion into mechanical energy, we call it a heat engine. ..
"Internal Combustion Engine" Internal Energy and Heat Engine PPT Courseware:
"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 _____ used in cars and...
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