Mistuned rotor blade array for passive flutter control
First Claim
1. An array of flow directing elements for use in turbomachinery comprising:
- a plurality of flow directing elements mounted to a rotor disk;
said plurality of flow directing elements comprising a first set of first flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge tip region; and
said plurality of flow directing elements further comprising a second set of second flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge region substantially at a midspan point of the flow directing surface.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to an improved array of flow directing elements for incorporation in turbomachinery. In accordance with the present invention, an array of flow directing elements comprises a plurality of flow directing elements mounted to a rotor disk. The plurality of flow directing elements includes a first set of first flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge tip region and a second set of second flow directing elements whose natural vibration frequency has been modified by having material removed from a midspan leading edge region. The array may further comprise unmodified flow directing elements arranged with the modified flow directing elements.
46 Citations
12 Claims
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1. An array of flow directing elements for use in turbomachinery comprising:
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a plurality of flow directing elements mounted to a rotor disk;
said plurality of flow directing elements comprising a first set of first flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge tip region; and
said plurality of flow directing elements further comprising a second set of second flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge region substantially at a midspan point of the flow directing surface. - View Dependent Claims (2)
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3. An array of flow directing elements for use in turbomachinery comprising:
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a plurality of flow directing elements mounted to a rotor disk;
said plurality of flow directing elements comprising a first set of first flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge tip region;
said plurality of flow directing elements further comprising a second set of second flow directing elements whose natural vibration frequency has been modified by having material removed from a midspan leading edge region; and
said first set of flow directing elements having frequencies of first bending, first torsion, and second bending vibration modes different from the first bending, first torsion, and second bending vibration mode frequencies of said second flow directing elements. - View Dependent Claims (4, 5, 6)
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7. An array of flow directing elements for use in turbomachinery comprising:
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a plurality of flow directing elements mounted to a rotor disk;
said plurality of flow directing elements comprising a first set of first flow directing elements whose natural vibration frequency has been modified by having material removed from a leading edge tip region;
said plurality of flow directing elements further comprising a second set of second flow directing elements whose natural vibration frequency has been modified by having material removed from a midspan leading edge region; and
third unmodified flow directing elements. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification