Gas turbines Main article: gas turbine Turbine Power Plant A gas turbine compresses air and uses it to turn a turbine. It is essentially a Jet engine which directs it's output to a shaft.
There are three stages to a turbine: 1) air is drawn through a compressor where the temperature rises due to compression, 2) fuel is added in the combuster, and 3) hot air is exhausted through turbines blades which rotate a shaft connected to the compressor. A gas turbine is a rotary machine similar in principle to a steam turbine and it consists of three main components: a compressor, a combustion chamber, and a turbine.The air, after being compressed in the compressor, is heated by burning fuel in it.About ? of the heated air, combined with the products of combustion, expands in a turbine, producing work output that drives the compressor.The rest (about ?) is available as useful work output.26 Gas Turbines are among the MOST efficient internal combustion engines. The General Electric 7HA and 9HA turbine electrical plants are rated at over 61% efficiency.
Diesel Ignition Process Diesel engines and HCCI (Homogeneous charge compression ignition) engines, rely solely on heat and pressure created by the engine in its compression process for ignition.The compression level that occurs is usually twice or more than a gasoline engine.Diesel engines take in air only, and shortly before peak compression, spray a small quantity of diesel fuel into the cylinder via a fuel injector that allows the fuel to instantly ignite. HCCI type engines take in both air and fuel, but continue to rely on an unaided auto-combustion process, due to higher pressures and heat.This is also why diesel and HCCI engines are more susceptible to cold-starting issues, although they run just as well in cold weather once started.Light duty diesel engines with indirect injection in automobiles and light trucks employ glowplugs (or other pre-heating: see Cummins ISB#6BT) that pre-heat the combustion chamber just before starting to reduce no-start conditions in cold weather.
Most diesels also have a battery and charging system; nevertheless, this system is secondary and is added by manufacturers as a luxury for the ease of starting, turning fuel on and off (which can also be done via a switch or mechanical apparatus), and for running auxiliary electrical components and accessories.Most new engines rely on electrical and electronic engine control units (ECU) that also adjust the combustion process to increase efficiency and reduce emissions.Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine
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