Combined diesel or gas(CODOG) is a type of propulsion system for ships that need a maximum speed that is considerable faster than their cruise speed, particularly warships like modern frigates or corvettes. 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 A ship is a large, sea-going watercraft, sometimes with multiple decks. ... USS Port Royal (CG-73), a Ticonderoga class cruiser. ... Frigate is a name which has been used for several distinct types of warships at different times. ... French steam corvette Dupleix (1856-1887) Canadian corvettes on antisubmarine convoy escort duty during World War II. A corvette is a small, maneuverable, lightly armed warship, smaller than a frigate. ...
For every propeller shaft there is one diesel engine for cruising speed and one gearedgas turbine for high speed dashes. Both are connected to the shaft with clutches, only one system is driving the ship in contrast to CODAG-systems, which can use the combined power output of boths. The advantage of CODOG is a simpler gearing compared to CODAG but it needs more powerfull (or more) gas turbines for the same maximum power output and also the fuel consumption at high speed is even worse compared to CODAG. A propeller shaft connects a propeller to an engine. ... 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... In mechanics, a transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. ... This machine has a single-stage radial compressor and turbine, a recuperator, and foil bearings. ... A clutch is a subcomponent of an engines transmission designed to allow engagement or disengagement of the engine to the gearbox or whatever apparatus is being driven. ... Combined diesel and gas, usually abbreviated CODAG is a type of propulsion system for ships, particularly warships. ...
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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