Rotor with integrated blading
AssigneeMTU Aero Engines AG
InventorsAxel Rossmann, Siegfried Sikorski, Wolfgang Krueger
Life of this patent
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Abstract
A rotor for a propulsion plant has hybrid rotor blades arranged circumferentially around and extending essentially radially from a rotor. To reduce vibrations, the rotor blade has a metallic blade root and each blade has a metallic blade section that forms at least a portion of the blade leading edge and the area of the blade surface adjacent to the blade leading edge, and a blade section made of fiber-reinforced synthetic material or composite material. The blade sections (3, 4) of each blade (1) are so correlated to each other that damage or loss of the composite material blade section (4) still enables the propulsion plant to deliver a required emergency power.
Claims10
A compressor rotor for a propulsion plant, said compressor rotor comprising a rotor blade carrier (18), rotor blades (1) secured to said rotor carrier, each rotor blade (1) comprising a metal blade root (2) securing said rotor blade to said rotor carrier (18), a first blade section (3) made of metal and a second blade section (4) made of fiber composite material, said first metal blade section (3) forming at least a portion of a blade leading edge (5), said second fiber composite material blade section (4) forming a blade trailing edge (11), means connecting said first metal blade section (3) and said second fiber composite material blade section (4) to each other along a trailing rim (12) of said first metal blade section (3), and wherein said first metal blade section (3) has a radial length along said leading edge (5) shorter than a length of said leading edge (5) and a surface area (15) extending between said radial length and said trailing rim (12) so that said surface area (15) has a size enabling said propulsion plant to deliver emergency power even if said second fiber composite material blade section (4) is broken off.
A blade for a compressor rotor, said blade (1) comprising a metal blade root (2) for attaching said blade to a rotor blade carrier, a first metal blade section (3), said first metal blade section (3) forming at least a portion of a blade leading edge (5), a second fiber composite material blade section (4) forming a trailing edge (11) of said blade (1), means connecting said first and second blade sections to each other along a trailing rim (12) of said first blade section (3), said first blade section having a radial length along said leading edge (5) shorter than a length of said leading edge (5), said first section (3) further comprising a surface area (15) extending between said radial length and said trailing rim (12) so that said surface area has a size enabling a compressor to deliver emergency power even if said second blade section (14) is broken off.
Dependencies are inferred from the claim text.