| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of tendency for opening a raffeted joint between a wheel and spacer due to the generation of stress and bending of a rotor inner hole by a thermal gradient, in a turbine having a steam cool passage around the rim of a rotor. SOLUTION: A compressor delivery air is supplied to a rotor inner hole and then passed in the wheel cave C between wheels 38, 40, 42, 44 and spacers 39, 41, 43 in direction a radially outer and streamed out to a high temperature gas passage through a communicating groove hole 82 and channel 80 provided on the wheel and spacer at positions with a clearance in a circumferentially radial direction. At the turbine start time, the cool air is streamed into the steam passage of a close circuit and cools the outside rim of the rotor and also the compressor delivery air preheats the wheel and spacer. At normal state, the cool steam is supplied to the steam passage, and also the compressor delivery air is supplied to the wheel cave through the rotor inner hole.
|
