Turbo-electric transmission
From The Art and Popular Culture Encyclopedia
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| - | '''[[ship prefix|SS]] ''Normandie''''' was a [[France|French]] [[ocean liner]] built in [[Saint-Nazaire]] [[France]] for [[Compagnie Générale Transatlantique]]. When launched in 1932 she was the largest and fastest ship in the world, and she maintains the distinction of being the most powerful steam [[turbo-electric]] propelled passenger ship ever built. Her novel design features and lavish interiors have led many to consider her the greatest of all ocean liners. Despite this, she was not a commercial success, and relied partly on government subsidy to operate. | + | |
| + | Turbo-electric drives are used in some [[locomotive]]s (gas turbines, e.g. with the first [[TGV]]) and ships (steam and sometimes gas turbines). The advantage of the turbo-electric transmission is that it allows the adaptation of high-speed turning turbines to the slow turning [[propeller]]s or [[wheel]]s without the need of a heavy and complex [[transmission (mechanics)|gearbox]]. It also has the second advantage of being able to provide electricity for the ship or train's other electrical systems, such as lighting, computers, radar, and communications equipment. | ||
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| + | A disadvantage shared with the more common [[Diesel-electric transmission|diesel-electric]] [[powertrain]] is that because of the double conversion of mechanical energy to electricity and back more energy gets lost than with a mechanical transmission. Gas turbines are much more [[Energy conversion efficiency|energy efficient]] than equally sized [[diesel engine]]s. Efficiency usually ranges from 30% to 38% for Diesel engines and from 40% to 60% in a gas turbine engine. | ||
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| + | ==See also== | ||
| + | * [[Gas turbine-electric locomotive]] | ||
| + | * [[Steam turbine-electric locomotive]] | ||
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Turbo-electric drives are used in some locomotives (gas turbines, e.g. with the first TGV) and ships (steam and sometimes gas turbines). The advantage of the turbo-electric transmission is that it allows the adaptation of high-speed turning turbines to the slow turning propellers or wheels without the need of a heavy and complex gearbox. It also has the second advantage of being able to provide electricity for the ship or train's other electrical systems, such as lighting, computers, radar, and communications equipment.
A disadvantage shared with the more common diesel-electric powertrain is that because of the double conversion of mechanical energy to electricity and back more energy gets lost than with a mechanical transmission. Gas turbines are much more energy efficient than equally sized diesel engines. Efficiency usually ranges from 30% to 38% for Diesel engines and from 40% to 60% in a gas turbine engine.
See also
