Platform for a swing root turbomachinery blade
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorRichard Ravenhall
Life of this patent
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Abstract
A rotor apparatus comprising a blade having a root adapted to swing laterally within a supporting spindle under impact loading is provided with a flow path defining platform. The platform comprises an inner shroud extending generally laterally of the blade airfoil portion and adapted to swing laterally therewith. In one embodiment wherein the blade primarily comprises a laminate of composite filament plies, the inner shroud is bonded to the laminate. An outer shroud, fixed with respect to the supporting spindle, forms a lateral extension of the inner shroud with the blade in its normal operating position. The inner and outer shrouds are provided with a pair of complementary adjacent surfaces contoured to pass in relatively close-fitting relationship to each other when the blade swings under impact loadings.
Claims13
A rotor apparatus comprising:
- a blade having a root portion and an airfoil portion;
- means for supporting said blade including a groove curved in a generally circular concave profile to receive the blade root, the blade root conforming partially to the same profile, such that the blade is permitted to rotate laterally within the groove;
- an inner flow path shroud extending generally laterally of the blade airfoil portion and laterally rotatable therewith;
- and
- an outer flow path shroud nonrotatable with respect to said supporting means and in general alignment with the inner flow path shroud when the blade is in an unrotated position;
- wherein
- said inner and outer shrouds are provided with a pair of complementary adjacent surfaces contoured to pass in relatively close-fitting relationship to each other when said blade is rotated laterally.
Dependencies are inferred from the claim text.