Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . INSON TURBINES. Rateau turbines are governed by throttling the steam pressureby means of valves controlled by the governor. Mr. JamesWilkinson has invented a system of governing steam turbines(see page 302) which is intended to be equivalent to the Corliss cut-off governing of reciprocating engines. He has appliedthis method of governing, together with some other uniquefeatures, to steam turbines of the Rateau type which were madeat the Corliss Engine Works, Providence,
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . INSON TURBINES. Rateau turbines are governed by throttling the steam pressureby means of valves controlled by the governor. Mr. JamesWilkinson has invented a system of governing steam turbines(see page 302) which is intended to be equivalent to the Corliss cut-off governing of reciprocating engines. He has appliedthis method of governing, together with some other uniquefeatures, to steam turbines of the Rateau type which were madeat the Corliss Engine Works, Providence, R. I. A Wilkinsonturbine-generator rated at 100 kilowatts for non-condensingservice (six stages) is shown by side and end sections in Figs. 140and 141. It will be observed that in this design the diaphragmsare dished as in Curtis turbines, while the disks are flat. Thedisks are made of forged steel, but the blades are bronze castingswhich are filed to a sharp edge on the side where the steam enters. Stage Packing. To prevent the leakage of steam between thediaphragms and the shaft (stage leakage), which in some impulse. Fig. 142. Wilkinson Labyrinth Stage Packing. turbines is a considerable loss — often 10 to 20 per cent. — avery ingenious system of steam packing has been devised. Adrawing illustrating this system is shown in Fig. 142. By thisdevice, steam containing a large amount of condensation is dis-charged into grooved packings between the diaphragms and the 256 THE STEAM TURBINE shaft through ducts drilled into the hubs of the disks. This wetsteam is taken from a part of the labyrinth packing at the high-pressure end of the turbine — through which there is alwayssome leakage of steam — and is conducted in the ducts shown inthe figure, which are arranged so that the steam discharged intoa diaphragm packing is at a slightly higher pressure than that oneither side of the diaphragm. It is probably possible in this wayto practically eliminate the loss due to stage lea
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