| 摘要 |
Dampers (56,76,96) are utilised with regard to mounting arrangements (50,70,90) in gas turbine engines (10) in order to facilitate cooling. It is known to provide slotted upper surface or cottage roof dampers to enhance cooling effect. However, cooling efficiency cannot be optimised and improving cooling effectiveness particularly between the parts of a mounting arrangement can be difficult without detrimental reductions in overall efficiency of a gas turbine engine (10) incorporating such a mounting. By provision of impingement jets (54,74,94) which extend through the damper (56,76,96) into slots (51,71,91) which define an upper surface of the damper (56,76,96) improvements in cooling efficiency can be achieved. The slots (51,71,91) are typically closed to reduce requirements with respect to pressure differentials. However, open ended slots (51,71,91) with impingement jets (54,74,94) can also be provided. Typically, the slots (51,71,91) extend laterally across the dampers (56,76,96) but could also extend longitudinally with closed ends or one end open. By such an approach improved heat transfer is achieved without necessary increases in pressure gradients and flow rates. |
