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公开(公告)号：JPH11236804A
公开(公告)日：1999-08-31
申请号：JP35696798
申请日：1998-12-01
Applicant: UNITED TECHNOLOGIES CORP
Inventor： EL-AINI YEHIA M , COWLES BRADFORD A
Abstract: PROBLEM TO BE SOLVED: To provide a vibration damping device which can be used in a rotor integrally equipped with rotor blades, is effective for periodical push-in actions and aperiodical perturbation, and also is effective for vibration of rotor blade having middle or low grade aspect ratio. SOLUTION: Rotor steps 32 for a gas turbine engine include a rotor disc and a plurality of rotor blades 36. The rotor disc is provided with a hole centering on the axis of rotation and a surface 40 in radial direction on the outside. The rotor blades 36 are extended from the surface 40 in radial direction on the outside to the outside in the radial direction and are distributed around the surface 40. At least one rotor blade 36 is positioned aslant (α) selectively relative to other adjacent rotor blade 36. This slant rotor blade increases the aerodynamic damping of the rotor steps.
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公开(公告)号：JPH11236803A
公开(公告)日：1999-08-31
申请号：JP35696698
申请日：1998-12-01
Applicant: UNITED TECHNOLOGIES CORP
Inventor： EL-AINI YEHIA M , COWLES BRADFORD A
Abstract: PROBLEM TO BE SOLVED: To provide a vibration damping device which can be used in a rotor integrally equipped with rotor blades, is effective for periodical push-in actions and aperiodical perturbation, and also is effective for vibration of rotor blade having middle or a low aspect ratio. SOLUTION: Rotor steps 32 for a gas turbine engine include a rotor disc and a plurality of rotor blades 36. The rotor blades 36 are extended from the surface 40 in radial direction on the outside of the rotor disc and are positioned apart at a specified distance 42 from one another. The distance 42 is changed selectively so that the aerodynamic damping of each rotor blade is increased. This selectively changeable inter-blade distance is at least 80% of uniform inter-blade distance.
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