Axial Turbomachine Stator with Segmented Inner Shell

Abstract

The present application relates to a compressor stator of an axial turbomachine having an inner shell formed of a plurality of annular segments arranged end to end, a layer of abradable material applied on the inner face of the shell, and an annular array of blades connected to the shell. The stator has at least one strip located in the layer of abradable material and extending from either side of the junctions between two adjacent annular segments. The inner tips of the blades have hooks mating mechanically with the strip.

Description

[0001]This application claims priority under 35 U.S.C. §119 to European Patent Application No. 12194325.2, filed 27 Nov. 2012, which is incorporated herein by reference for all purposes.BACKGROUND[0002]1. Field of the Application[0003]The present application relates to an axial turbomachine. More particularly, the present application relates to a stator of an axial turbomachine comprising a segmented inner shell. The present application also relates to a stator assembly process. The present application also relates to an axial compressor.[0004]2. Description of Related Art[0005]In order to guide an annular flow, an axial turbomachine is fitted with coaxial shells defining the inside and outside of the flow. In a stator, internal shells are essentially connected to the stator blade tips. They form cylindrical walls having openings through which the stator blade tips are inserted so as to fix them.[0006]The openings are larger in order to facilitate inserting the blade tips, the gaps ...

AI Technical Summary

Benefits of technology

The device described in this patent text can modify the frequency response of an inner shell by changing its stiffness at the joint between two segments. The strip remains flexible and does not completely stiffen the junctions, allowing the inner shell to contain destructive vibrational modes. The device acts on the low-frequency vibrational modes that are most harmful and does not affect the mass or inertia of the shell. The device includes blades that improve anchoring and prevent low-frequency vibrational modes, making stator assembly easier.

Problems solved by technology

However, in operation, such a shell is subjected to frequency excitations.

As a consequence of this, the inner shell can develop destructive vibrational modes.

This need for an increased amount of material increases the weight of the shell and therefore affects its vibrational response.

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