| 摘要 |
PURPOSE:To maintain the temperatures in the vicinities of the root portions of moving vanes at a predetermined value to maintain high efficiency of the titled mechanism by utilizing a bimetal in a seal fin material, in the titled mechanism provided with seal fins for adjusting the flow quantity of cooling air between the rotary body side and the stationary body side. CONSTITUTION:In the cooling air system of the gas turbine, cooling air 2 flowing on the front side of a first stage moving vane 1, is adjusted by a seal fin 5 mounted on a support ring 4 on the inner side of a first stage moving vane 10, and after cooling the vane root portion, cooling air 2 is causted to flow out to the gas path. In addition, cooling airs 6 and 7 flowing on the rear side of the first stage stationary vane 1 and the front side of the second stage moving vane 10 similar cool the root portions of the respective vanes, and then flow out to the gas path. In this case, a bimetal is used as a material for seal fins 5 and 9 provided in the support ring 4 and the second stage stationary vane diaphragm 8 is used, and changes gaps 12 between the vane root portions and seal rands 13 to constantly make optimum the flow quantity of cooling air in accordance with the temperature at the vane root portion. |
