roue de Pelton
- Domaine
-
- génie mécaniqueturbine hydraulique
- Date
Définitions :
Turbine hydraulique à impulsion utilisable pour de grandes hauteurs de chute.
Turbine à impulsion dans laquelle l'eau est dirigée à haute vitesse par des ajutages sur des coupelles montées sur la circonférence d'une roue tournant dans une enceinte.
Terme :
- roue de Pelton n. f.
Terme associé :
- roue Pelton n. f.
Traductions
-
anglais
Date :Définition
A hydraulic turbine of the impulse type in which a jet of water is directed at specially shaped buckets attached round the periphery of a wheel so turning the wheel on its axis. This type of turbine was patented in 1880 by L A Pelton and is normally used where a high head of water is available as in many hydroelectric schemes. Efficiencies of 90+ per cent are possible and power outputs of 60,000 kW.
Pelton wheels. These are impulse turbines in which water passes through needle nozzles and is directed as high velocity jets at cup-shaped buckets mounted on the rim of the wheel and enclosed in a housing. The shaft may be horizontal or vertical but the trend is towards vertical shafts in large turbines because several jets can be used effectively on each wheel. Efficiency is increased, partly because of reduction of friction. Pelton wheels are used where the water head is high, from 150 metres to 1900 metres.Terme :
- Pelton wheel