1 Classification
External gas turbine
An external-combustion engine, which burns its fuel on the outside of the engine, was developed in 1816 by the Scottish R. Stirling invented, so it is also called Stirling engine. The engine converts the heat generated by combustion into kinetic energy. The steam engine modified by Watt is a typical external combustion engine. When a large amount of coal burns heat energy to heat water into a large amount of water steam, high pressure is generated, and then this high pressure pushes the machinery to do work, thus completing the transformation of heat energy into kinetic energy.
Internal combustion engine
Internal combustion engine is reciprocating piston engine. The biggest difference between this type of engine and external combustion engine is that its fuel is burned inside. There are many kinds of internal combustion engine, the common gasoline engine, diesel engine is the typical internal combustion engine.
Gas turbine
In addition, there is a gas turbine, which is characterized by high pressure gas combustion, and uses the high pressure of the gas to push the blade of the gas turbine to rotate, so as to output power. Gas turbines are widely used, but they are rarely used in cars and motorcycles, and only in some racing cars, because of the difficulty in fine-tuning the power output.
Jet engine
Jet engine refers to the engine that produces direct reaction thrust from the jet nozzle at high speed. Widely used as a power plant for aircraft. The fuel and oxidizer react chemically in the combustion chamber to release heat energy. The heat energy is then converted into the function of regulating the airflow in the nozzle. In addition to the fuel, the oxidizer carried by the aircraft is called the rocket motor, including solid fuel rocket motor and liquid fuel rocket motor.
2 Basic parameters of internal combustion engine
displacement
Engine displacement is the sum of the working volume of each cylinder of the engine, generally expressed in liters (L). The cylinder working volume refers to the volume of gas swept by the piston from top dead center to bottom dead center, also known as the single cylinder displacement, which depends on the cylinder diameter and piston stroke. The engine displacement is a very important engine parameter, which can represent the size of the engine more than the cylinder diameter and the number of cylinders. Many indexes of the engine are closely related to the displacement. Generally speaking, the larger the displacement, the more power the engine produces.
Number of cylinders
Car friends are often reflected in the engine column of car information to see "L4", "V6", "V8", "W12" and other words, want to understand what is the meaning. These represent the arrangement of engine cylinders and the number of cylinders. There are 3 cylinders, 4 cylinders, 6 cylinders, 8 cylinders, 10 cylinders, 12 cylinders and so on.
3 cylinder arrangement form
Cylinder arrangement form, as the name implies, refers to the form of the arrangement of the cylinders in a multi-cylinder internal combustion engine, which is, frankly speaking, the form of the exhaust of the cylinders on an engine. Current mainstream engine cylinder arrangement form:
L: Straight line
V: V-shaped arrangement
Other non-mainstream cylinder arrangement:
W: W type arrangement
H: Horizontally opposed engine
In-line engine:
Inline engine, usually abbreviated as L, L4 stands for inline four.
