Mistuning of turbine blades with one or more internal cavities

US11319815B2 · kind B2 · utility

Assignee

• Siemens Energy Global GmbH & Co. KG · DE

Inventors

• Daniel M. Eshak · Orlando, US
• Susanne Kamenzky · Berlin, DE
• Daniel Vöhringer · Berlin, DE
• Stefan Schmitt · Oebisfelde, DE
• Heinrich Stüer · Haltern, DE
• Yuekun Zhou · Charlotte, US
• Samuel R. Miller, Jr. · Port St. Lucie, US

Key dates

• Filing date: Apr 13, 2018
• Grant date: May 3, 2022
• Expiry date: Apr 13, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2260/961
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A bladed rotor system includes first and second sets of blades with respective airfoils each having at least one internal cavity. The airfoils of both the first and second sets of blades have identical outer shapes defined by an outer surface of an outer wall of the respective airfoils. The airfoils of the first set of blades are distinguished from the airfoils of the second set of blades by a geometry and/or position of at the least one internal cavity, which is unique to blades of a given set. The natural frequency of a blade of the first set differs from the natural frequency of a blade of the second set by a predetermined amount. The blades of the first set and the second set are alternately arranged in a periodic fashion in said circumferential row, to provide a frequency mistuning to stabilize flutter of the blades.