Intentionally mistuned integrally bladed rotor
First Claim
1. An integrally bladed rotor (IBR) for a gas turbine engine, comprises a hub and a circumferential row of blades projecting integrally from said hub, the row including an even number of blades alternating between blades having first and second airfoil definitions around the hub, each blade having a pressure side and a suction side disposed on opposed sides of a median axis and extending between a trailing edge and a leading edge, the first and second airfoil definitions being different and having respective pressure side thicknesses T1 and T2 defined between respective median axes and respective pressure sides of the blades, the pressure side thickness T1 of the first airfoil definition being greater than the pressure side thickness T2 of the second airfoil definition.
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Accused Products
Abstract
A frequency mistuned integrally bladed rotor (IBR) for a gas turbine engine comprises a hub and a circumferential row of blades of varying frequency projecting integrally from the hub. Each blade in the row alternate with another blade having a different pressure surface definition but similar suction surface, leading edge and trailing edge definitions.
58 Citations
13 Claims
- 1. An integrally bladed rotor (IBR) for a gas turbine engine, comprises a hub and a circumferential row of blades projecting integrally from said hub, the row including an even number of blades alternating between blades having first and second airfoil definitions around the hub, each blade having a pressure side and a suction side disposed on opposed sides of a median axis and extending between a trailing edge and a leading edge, the first and second airfoil definitions being different and having respective pressure side thicknesses T1 and T2 defined between respective median axes and respective pressure sides of the blades, the pressure side thickness T1 of the first airfoil definition being greater than the pressure side thickness T2 of the second airfoil definition.
- 7. A frequency mistuned integrally bladed rotor (IBR) for a gas turbine engine, comprising a hub and a circumferential row of blades of varying frequency projecting integrally from the hub, the row including an even number of blades, each blade in the row alternates with another blade having a different pressure surface definition but substantially identical suction surface, leading edge and trailing edge definitions.
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13. A method of reducing vibration in an gas turbine engine integrally bladed rotor (IBR) having a circumferential row of blades extending integrally from a hub, the circumferential row of blades comprising an even number of blades;
- the method comprising varying the natural frequency of the blades around the hub in an alternate pattern by providing first and second distinct airfoil profiles around the hub, the first and second profiles having similar suction side, leading edge and trailing edge profiles but a different pressure side profile.
Specification