Monolithic Compressor Stator Blade Damping
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Solution Overview
Problem
Existing compressor stator blade structures face issues with vibration-induced bolt slacking, complex assembly, limited shape flexibility, and reduced damping effect, which are exacerbated by increased pressure loads and air demands in gas turbines.
Innovation Solution
A compressor design featuring stator blades with a monolithic structure formed by milling, comprising an outer and inner shroud integrated with the blade portions, where the inner shroud is disposed in a groove on the outer circumferential surface of an inner barrel, enhancing rigidity and minimizing axial length for improved aerodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a seal holder with bolts is used to secure stator blades, then rigidity is increased to improve damping, but the bolts are liable to slacken due to vibrations and the assembly structure becomes complicated
Solution Approach 1:
The invention merges the seal holder and stator blade into a single integrated structure. The seal holder is formed as an integral part of the stator blade assembly, eliminating the need for separate bolt fastening components. This unified structure maintains the damping effect while simplifying the assembly and eliminating bolt slacking issues.
Solution Approach 2:
The integrated seal holder-stator blade structure serves multiple functions simultaneously: it provides sealing, structural support, and vibration damping. The single structure performs the roles of both the seal holder and the stator blade, reducing the number of components needed while maintaining all necessary functions.
2Stability of the object's composition
If a seal holder with bolts is used to secure stator blades, then rigidity is increased to improve damping, but the flexibility of shape is reduced
Solution Approach 1:
The stator blade assembly is segmented into functional zones within the integrated structure. The seal holder portion and blade portion are distinct but connected, allowing each section to be optimized for its specific function while maintaining overall rigidity. This segmentation enables shape flexibility in design while preserving structural stability.
Solution Approach 2:
By combining the seal holder and stator blade into one piece, the design achieves both rigidity and shape flexibility. The integrated structure allows for optimized aerodynamic shapes and configurations without the constraints of separate components and fasteners, while maintaining the necessary structural rigidity for damping.
3Stability of the object's composition
If a seal holder is mounted on the stator blade, then damping is improved, but additional space is required for mounting
Solution Approach 1:
The seal holder and stator blade are merged into a single integrated component, eliminating the need for separate mounting space. The structure is formed as one piece through molding or machining, requiring no additional axial or radial space for separate mounting hardware or assembly clearance.
Solution Approach 2:
The seal holder structure is nested within the stator blade assembly in such a way that it occupies the same spatial envelope. The integrated design allows the seal holder functionality to be embedded within the blade structure itself, minimizing additional space requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The monolithic structure provides increased damping, reduced air leakage, and improved aerodynamic performance by minimizing axial length and maintaining a simple, flexible design, suitable for high-pressure gas turbines.
Implementation Method 1
rigidity is increased to improve damping relative to blade vibration
Data Source
AI summary
It is an object of the present invention to provide a compressor that has a simple structure, produces a damping effect and improves aerodynamic performance.In a compressor including stator blades 4 circumferentially mounted to an inner circumferential surface side of a casing 6 forming a annular path; and an inner barrel 7 supported by the casing and arranged on the radially inside of the stator blade as a partition wall on the radial side of the annular path; the stator blade includes an outer shroud 10 mounted to an inner circumferential surface of the casing at a position facing the inner barrel, and an inner shroud 11 supporting a blade portion at an inner diameter side, the inner shroud being disposed in an annular groove formed in an outer circumferential surface of the inner barrel facing the inner shroud. The stator blade including the outer shroud 10, the inner shroud 11 and the blade portions 9 are formed in a monolithic structure by milling.