The external combustion engine, which means that its fuel is burned outside the engine, was invented by R. Stirling of Scotland in 1816, so it is also called the Stirling engine. The engine converts the heat energy generated by this combustion into kinetic energy. The steam engine modified by Watt is a typical external combustion engine. When a large amount of coal is burned to produce heat and heat the water into a large amount of steam, high pressure is generated. The high pressure pushes the machine to do work, thus completing the conversion of thermal energy to kinetic energy.
internal combustion engine
Knowing what an external combustion engine is, you know what an internal combustion engine is. The internal combustion engine is a reciprocating piston engine,
The biggest difference between this type of engine and the external combustion engine is that its fuel is burned inside. There are many types of internal combustion engines. Common gasoline engines and diesel engines are typical internal combustion engines.
In addition, there is a gas turbine. The working characteristic of this kind of engine is to produce high-pressure gas by combustion. The high pressure of the gas is used to push the blades of the gas turbine to rotate, thereby outputting power. Gas turbines are used in a wide range, but because it is difficult to finely adjust the output power, cars and motorcycles rarely use gas turbines, and only some racing cars have used gas turbines.
The jet engine refers to an engine that directly generates a reaction thrust by the airflow ejected by the nozzle at high speed. It is widely used as the power plant of aircraft. The fuel and oxidant react chemically in the combustion chamber to release heat energy. The heat energy is then converted into a function of adjusting the air flow in the nozzle. In addition to fuel, the oxidants carried by the aircraft are called rocket engines, including solid fuel rocket engines and liquid fuel rocket engines.