Developments relating to a rotor arrangement
AssigneeROLLS-ROYCE plc
InventorsJonathan J Morgan, Nigel Twiggs, Christian H Enderby
Life of this patent
Estimating the term…
Abstract
A rotor arrangement has a rotor-section and a circumferential moveable seal around the rotor-section. The arrangement being such that, for a given rotation rate, the rotor-section is subject to an associated radial growth and a corresponding related axial displacement, relative to the seal. The rotor-section is provided with an axially-varying profile for off-setting said radial growth of the rotor-section, adjacent the circumferential seal, at said given rotation rate.
Claims11
A rotor arrangement comprising:
- a rotor-section and a circumferential sealing-element around the rotor-section, wherein, in operation, rotation of the rotor-section is accompanied by radial growth of the rotor-section and by axial displacement of the rotor-section relative to the circumferential sealing-element, the rotor-section having a sealing surface for co-operation with the circumferential sealing-element,
- a profile of the sealing surface being such that, at a given operational rotation speed of the rotor, the accompanying radial growth of the rotor-section adjacent the circumferential sealing-element is substantially compensated for by a corresponding axial displacement of the rotor-section.
A method of determining the profile of a rotor-section for use in a rotor arrangement including a circumferential sealing-element around the rotor-section which co-operates with a sealing surface provided on the rotor-section, wherein, in operation, rotation of the rotor-section is accompanied by radial growth of the rotor-section and by axial displacement of the rotor-section relative to the circumferential sealing-element, the method comprising:
- estimating the accompanying radial growth and corresponding axial-displacement of the rotor-section at a given operational rotation speed;
- and
- based on said estimate, determining a profile for the sealing-surface such that, at the given operational rotation speed of the rotor, the accompanying radial growth of the rotor-section adjacent the circumferential sealing-element is substantially compensated for by a corresponding axial displacement.
Dependencies are inferred from the claim text.