| 摘要 |
The wall element, e.g. forming part of a turbine blade, has a plurality of cooling holes 30 extending thereacross which are contoured to provide lower rates of convective cooling in the wall material adjacent the cool side 32 than adjacent the hot side 34. This may be achieved by arranging the portion 36 of each hole adjacent cool side 32 as being perpendicular thereto whereas the remaining portion 38 is inclined relative to hot side 34 so as to increase the wetted surface area of the hole adjacent side 34. Thermal gradients and resulting stresses across the wall element are thus reduced. <IMAGE>
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