| 摘要 |
A double-wall structure is provided for use in components in gas turbine engines that are exposed to high temperatures. The double-wall structure has a first wall spaced apart from a second wall. The first wall has a protrusion extending therefrom towards the second wall. The second wall has a cooling fluid orifice, or hole, therein through which cooling fluid is directed in use towards the protrusion. The protrusion extends across a significant percentage of the gap between the first and second walls. The cooling fluid removes heat from protrusion as it flows over it through convection, thereby cooling the first wall. The cooling fluid is also redirected so as to become more aligned with the first wall as it flows over the protrusion. In some cases, a trench is provided at the base of the protrusion. The cooling fluid causes a vortex to form in the trench, thereby further assisting cooling. Thus, the double-wall structure of the present invention provides improved cooling of hot surfaces in a gas turbine, such as those found in the combustor.
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