Sisäpolttoisessa

Sisäpolttoisessa refers to internal combustion in Finnish. An internal combustion engine is a heat engine where the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gas produced by combustion applies direct force to a component of the engine, such as pistons or turbine blades. This force moves the component over a distance, converting chemical energy into useful mechanical energy.

The most common types of internal combustion engines are reciprocating piston engines, such as those found in most cars and trucks. These engines work by burning fuel in cylinders, which pushes pistons up and down. This linear motion is then converted into rotational motion by a crankshaft, which ultimately powers the vehicle. Other types of internal combustion engines include gas turbines, which are used in jet aircraft and power plants, and rotary engines, such as the Wankel engine.

Internal combustion engines are classified based on their operating cycle, such as the Otto cycle (for gasoline engines) or the Diesel cycle (for diesel engines). They can also be classified by the type of fuel they use, such as gasoline, diesel fuel, natural gas, or hydrogen. The efficiency and emissions of internal combustion engines are important factors in their design and application, with ongoing research focused on improving both aspects.