Combined diesel and gas, usually abbreviated CODAG is a type of propulsion system for ships, particularly warships. Propulsion method may refer to a number of different articles: For a list of space transport methods, see spacecraft propulsion. ... Italian ship-rigged vessel Amerigo Vespucci in New York harbor, 1976. ... USS Port Royal (CG-73), a Ticonderoga class cruiser. ...
It consists of having diesel engines (presumably for fuel economy) and a gas turbine (presumably for its high power-to-weight ratio and burst speed capability). The diesel engine is a type of internal combustion engine; more specifically, it is a compression ignition engine, in which the fuel is ignited by being suddenly exposed to the high temperature and pressure of a compressed gas containing oxygen (usually atmospheric air), rather than a separate source of ignition... For the workstation, see SGI Fuel. ... This machine has a single-stage radial compressor and turbine, a recuperator, and foil bearings. ...
In a gas turbine, large volumes of air are compressed to high pressure in a multistage compressor for distribution to one or more combustion gases from the combustion chambers power an axial turbine that drives the compressor and the generator before exhausting to atmosphere.
Diesel is a reciprocating engine which uses dieselfuel (distillate) for high-speed or heavy oil (residual for mid- and low-speed engines.
Diesel generators play an important role as local reserve, particularly where the transmission tie is radial or of marginal reliability for other reasons.
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