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US 2009/0214355 A1Published application
Fixing method for a tip winglet and reduced tip leakage blade
OwnerMichele Pereti, Joergen Ferberinventors
Life of this patent
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Abstract
Reducing the tip leakage for an existing compressor or turbine blade (10), including internally cooled blades, can be achieved by retrofitted the blade with a tip leakage-reducing device in the form of a winglet (12). The winglet (12) can be fixed onto the tip portion by bonding the winglet onto the face or faces of the blade by a key and slot arrangement.
Claims4
A method for modifying a turbine or compressor blade, the blade having a tip portion with a tip wall, a pressure face, and a suction face, the method comprising:
- machining at least one slot through at least one of said faces;
- providing a winglet having at least one key on an inner edge face, such that said at least one key is receivable in said at least one slot;
- engaging said inner edge face of said winglet with said at least one face, including inserting said at least one key in said at least one slot;
- and
- bonding said winglet to said at least one face.
2 more elements
A turbine or compressor blade comprising:
- a tip portion having a tip wall;
- a pressure face;
- a suction face;
- a winglet with an inner edge face on the tip portion, configured and arranged such that in use blade tip leakage is reduced;
- at least one slot through at least one of said pressure and suction faces;
- at least one key on said winglet inner edge face, said at least one key being configured and arranged to be received in said at least one slot;
- wherein said at least one key is received in said at least one slot with said inner edge face engaging with said tip portion;
- and
- wherein said winglet is bonded to at least one of said faces.
6 more elements
Dependencies are inferred from the claim text.