FROM THE EXPERIENCE OF EQUILIBRATING TURBINE ROTORS AT THE KALUGA TURBINE PLANT,
Abstract
Some practical experiences gained during balancing of turbine rotors are discussed briefly and qualitatively. Since the balancing machinery for flexible shafts is not yet available, the factory balances the rotors prior to mounting. Use of conical centering heads on the rotors results in very low accuracy because the rotors have no shoulders. To eliminate this difficulty, the rotors are press fitted on a temporary hub. To decrease initial unbalance, the turbine blades are weighed, and equal weights are placed at diametrically opposed locations. It has been found that preliminary static balancing is unsatisfactory for some impellers (up to 8000 newtons). In these cases, preliminary dynamic balancing is performed prior to assembly of the outer disk, (impeller blades are machined to get initial balance). After assembly, a final dynamic balancing is performed. In the balancing of welded rotors with hollow internal chambers, it has been found useful to make sure that each section is concentric with respect to an outer control surface. During welding these control surfaces are used to obtain proper alignment. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 25, 1968
- Accession Number
- AD0679729
Entities
People
- Yu. A. Shchetsinskii
Organizations
- National Air and Space Intelligence Center