| 摘要 |
An air-cooled variable guide vane for effecting changes in the area of a turbine nozzle throat in a gas turbine engine. Structurally, the aerofoil 58 of the guide vane 48 comprises a load-bearing spine 70 and a thermally warpable skin 72, which includes the trailing edge and which is attached (e.g. by welds 74a,74b) to the spine 70 spanwise of each flank of the aerofoil, but is not attached to the rest of the guide vane. During operation of the engine, differential thermal expansion of the two flanks of the thermally warpable skin 72 with respect to each other relative to their cool state makes the trailing edge of the aerofoil move with respect to the leading edge to cause changes in the area of the turbine nozzle throat T, these changes being regulated by altering the pressure of cooling air using valves (65 Fig. 2, not shown) and directing it onto the interior of the thermally warpable skin 72 via holes 78 in an inner skin 60 of the aerofoil. <IMAGE>
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