公开(公告)号：JPH08100603A

公开(公告)日：1996-04-16

申请号：JP25134495

申请日：1995-09-28

Applicant: ABB MANAGEMENT AG

Inventor： UIIRIIMU NGUIEN

IPC: F01D5/30

Abstract: PROBLEM TO BE SOLVED: To prolong the useful life longevity of bladed rotor components by setting a first radius of curvature smaller than a second radius of curvature both adjacent to a supporting surface and setting at a specific value the opening angle between the supporting surface and a tangent to a circle arc described by the first radius of curvature at each end point of the supporting surface. SOLUTION: A supporting surface F produced during rotation of a drum rotor 1 because of the centrifugal acceleration of moving blades is interposed between rotationally symmetric indentations 21 and 10 of the respective drum rotor 1 and moving blades. The supporting surface F is described by end points A and B and an inclination 12 relative to a line 6 parallel to the longitudinal axis of the moving blades. A straight line T passing the end point A of the supporting surface F meets the supporting surface F at an opening angle W of at least forty degrees. The straight line T tangentially adjoins an A-C circle arc 22 with a first radius of curvature R1 and with a center point located on a perpendicular to the straight line T. The other end point C of the A-C circle arc 22 connects to a C-D straight line 23 that is tangential to it and at the same time tangential to a D-E circle arc 24 of a second radius of curvature R2. The second radius of curvature R2 is larger than the first radius of curvature R1.