Blade arrangement and associated gas turbine

摘要

A blade arrangement with a rotor and a plurality of blades which are distributed in a ring along the circumference of the rotor is provided. Two immediately adjacent blades of the ring form a blade pair, between the blades of which a damping element is arranged, and wherein the respective damping element comes into contact with the two blades of the blade pair assigned to them during a rotation of the rotor about a rotor axis as a result of a centrifugal force which acts in the radial direction. In order to bring about frequency detuning of the oscillation properties of blades, as a result of which machining of the turbine blade becomes unnecessary, it is proposed that the blade ring has at least two blade pairs with different damping elements.

主权项

1. A blade arrangement, comprising:
a rotor; and a plurality of blades which are distributed in a ring along the circumference of the rotor and each of the plurality of blades comprises respectively in succession a blade root, a platform and a blade airfoil, wherein two immediately adjacent blades of the ring form a blade pair and include at least one damping element, wherein each respective at least one damping element comes into contact with each platform of each blade of the blade pair during a rotation of the rotor about a rotor axis as a result of a centrifugal force acting in a radial direction, wherein, for adjusting the natural frequencies of each of the plurality of blades, the blade ring includes at least two blade pairs with different at least one damping element and each of the plurality of blades of the ring is assigned to two different blade pairs and wherein two groups of blade pairs are provided, within each group the damping elements are in each case identical and the damping elements differ from group to group, wherein a first group and a second group of blade pairs are provided, and wherein a majority of the blade pairs or each blade pair of the first group has an adjacent blade pair of the first group and an adjacent blade pair of the second group.