sisäpolttoiset

Sisäpolttoiset refers to internal combustion engines, a type of heat engine where the combustion of a fuel occurs with an oxidizer (usually an atmospheric gas) in a combustion chamber that is an integral part of the working fluid flow circuit. The expansion of the high-temperature and high-pressure gas products of combustion acts directly on some part of the engine, such as a piston or turbine blade, generating mechanical work.

Internal combustion engines are commonly used in vehicles, including cars, motorcycles, and trucks, as well as in aircraft, boats, and generators. They convert chemical energy stored in fuel into mechanical energy through a controlled explosion. The process typically involves several strokes, such as intake, compression, combustion (power), and exhaust, in reciprocating engines.

The fuel used in internal combustion engines can vary, including gasoline, diesel, natural gas, and other specialized fuels. The efficiency and emissions of these engines are critical areas of development, with ongoing research focused on improving fuel economy and reducing harmful pollutants. Variations exist, such as rotary engines and gas turbines, which operate on different principles but are still classified as internal combustion.