Fluid reaction surfaces (i.e. – impellers) – With weight-balancing means – Self-shifting or selectively adjustable mass
Patent
1981-12-04
1984-07-17
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With weight-balancing means
Self-shifting or selectively adjustable mass
416500, F01D 510
Patent
active
044603142
ABSTRACT:
A blade for a turbomachine having an aerofoil portion and a root portion. The blade is provided with a vibration damper for damping a predetermined vibration of the blade. The damper comprises a closed chamber 14 within the aerofoil portion 13 adjacent the tip of the blade, and liquid 15 within the chamber 14. The volume of liquid 15 is less than the volume of the chamber 14. The chamber 14 is shaped, positioned, and aligned relative to the blade, so that in use the liquid 15 is constrained to form a column which oscillates in the chamber 14 in radial directions and in the same directions as the vibration to be damped. The volume, mass, and viscosity of the liquid are all chosen in relation to the frequency vibration (W.sub.B) of the vibration to be damped and the rotor speed (W.sub.E) so that, in use, the length (L) of the column of liquid is such that ##EQU1## where R=the blade tip radius. In this way the liquid 15 is caused to oscillate, under centrifugal loads, at a natural frequency which matches, or is close to, the resonant frequency of the vibration to be damped.
REFERENCES:
patent: 1398062 (1921-11-01), Brooks
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patent: 2349187 (1944-05-01), Meyer
patent: 2689107 (1954-09-01), Odegaard
patent: 2999669 (1961-09-01), McGinnis
Powell Jr. Everette A.
Rolls-Royce Limited
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