Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Patent
1988-08-30
1990-04-24
Garrett, Robert E.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
416196R, 416500, 416DIG2, 416181, 298897, F04D 2938
Patent
active
049195930
ABSTRACT:
A retrofitted rotor blade having a longer length than an original rotor blade provided for a steam turbine rotor assembly has a tuned airfoil portion with natural resonant frequencies in a plurality of vibrational directions similar to the original rotor blade. Since lengthening the blade causes a decreased and resonant frequency, a unique combination of tuning techniques raises the resonant frequencies to the required levels. The tip of the retrofitted rotor blade is profiled to increase the natural resonant frequency in the second mode of vibration, which is in the axial direction of the rotor.
REFERENCES:
patent: 1544318 (1925-06-01), Hodgkinson
patent: 3412611 (1968-11-01), Eccles et al.
patent: 3653110 (1972-04-01), King, Jr. et al.
Garrett Robert E.
Kwon John T.
Westinghouse Electric Corp.
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