Variable camber vane

Details Variable camber vane Variable camber vane

1999-06-10

2001-01-30

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

C415S150000

Reexamination Certificate

active

06179559

ABSTRACT:

The invention relates to a variable camber vane for a gas turbine engine.
More particularly the invention concerns the movable section of a variable camber intake guide vane which forms part of a vane ring in the intake of a gas turbine propulsion engine ahead of the first compressor rotor stage.
In order to maintain operating stability of the compressor of a gas turbine propulsion engine over a wide range of mass flow rates and operating speeds it is considered advisable to employ a movable vane. Such vanes have two major aerodynamic effects: one, to turn the airstream through an angle to meet the blades of a succeeding rotary stage; two, to reduce the effective inlet area of the stage. Because the dimensions of the inlet tract are relatively large at the front of an engine such vanes are correspondingly big and the aerodynamically generated forces acting on a movable blade when it is turned to the incoming airstream are also large. It is usual for the vanes to be pivoted on an axis in the mid-chord region in order that the forces may be balanced about the axis. This reduces the actuation forces required to turn and hold the vane, and consequently the stresses and strains to which the vane is subject as compared to an edge pivoted vane.
However, in some circumstances it may be necessary to employ an edge pivoted vane in which case the problems resulting from high and unbalanced forces acting on the vane have to be tackled. The present invention has for one objective to provide a solution to these problems.
According to one aspect of the invention there is provided a variable camber vane for a gas turbine engine comprising a fixed leading section and a movable trailing section comprising a vane section pivotally mounted about an axis through its upstream edge adjacent the downstream edge of the fixed leading section wherein a radially outer edge of the movable section and the surface of a surrounding casing are matching part-spherical surfaces in a region including at least the sweep of the movable vane section and the radially outer edge of the movable vane section is flanged and curved to match the part-spherical surface of the adjacent casing region.


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