Penstock is now used as a general term for a water passage and control that is under pressure, whether it supplies an impulse turbine or not.
12.
He combined the principles of the Laval turbine and the Parsons turbine into a multi-stage impulse turbine ( similar to the independently developed Rateau Turbine ).
13.
In the first stage the turbine is largely an impulse turbine ( similar to a pelton wheel ) and rotates because of the impact of the hot gas stream.
14.
Sir Charles Parsons ( 1854 1931 ) for invention of the reaction turbine, and to Swedish engineer Gustaf de Laval ( 1845 1913 ) for invention of the impulse turbine.
15.
In the 1870s and deriving from uses in the mining industry, the high efficiency Pelton wheel impulse turbine was developed to use hydropower under very different flow and pressure conditions.
16.
In an impulse turbine the available head is high and there is no significant effect on the efficiency if the turbine is placed a couple of meters above the tail race.
17.
Technological advances had moved the open water wheel into an enclosed turbine or Pelton wheel impulse turbine, which utilized hydropower from the high head streams characteristic of the mountainous California interior.
18.
Whilst this makes the Parsons turbine much longer and heavier, the overall efficiency of a reaction turbine is slightly higher than the equivalent impulse turbine for the same thermal energy conversion.
19.
Upon completion,'Foote's Pelton wheel'performed successfully as the world's largest operating impulse turbine wheel; it was in continuous use for over 30 years.
20.
A schematic diagram of the Curtis stage impulse turbine, with two rings of moving blades one ring of fixed blades is shown in "'figure 1 " '.
