Turbomachine Vane Segment Detuning Vibrations
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Solution Overview
Problem
Turbomachines, particularly gas turbines, face challenges in managing vibrations effectively, which affect their operating behavior and efficiency.
Innovation Solution
The implementation of guide vane segments with an inner ring segment and cavities containing impulse bodies for impact contact, arranged in detuning areas to reduce vibration modes by altering natural frequencies and shapes, rather than relying on frictional dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If impulse bodies are arranged on guide vanes for impact contact, then vibrations are reduced through detuning of natural frequencies, but device complexity increases due to additional components and their arrangement
Solution Approach 1:
The guide vane segment is divided into multiple individual guide vanes (first guide vane, second guide vane, etc.) arranged around the inner ring segment. Each guide vane can be independently equipped with impulse bodies or cavities, allowing localized vibration control without requiring modification of the entire structure. This segmentation enables targeted detuning of specific vibration modes while maintaining overall system simplicity.
Solution Approach 2:
Impulse bodies or cavities are selectively positioned at specific locations on the guide vanes, particularly at regions experiencing high vibrational stress or at critical nodal points. This local placement optimizes the detuning effect on cluster modes while minimizing the number of impulse bodies required, thereby reducing overall device complexity compared to uniform distribution.
2Reliability
If multiple guide vane segments are arranged next to each other to form complete guide vanes, then the turbomachine stage functionality is improved, but manufacturing and assembly complexity increases
Solution Approach 1:
The complete guide vane structure is segmented into multiple guide vane segments that can be manufactured separately and then assembled around the inner ring segment. Each segment can be produced using standard manufacturing processes, and the modular design facilitates quality control and reduces manufacturing difficulty compared to producing a single large integrated structure.
Solution Approach 2:
Multiple guide vane segments are combined around the inner ring segment to form the complete guide vane assembly. The inner ring segment serves as a common structural element that unifies the segments, providing both structural support and a mounting surface for impulse bodies or cavities. This merging approach maintains reliability while simplifying manufacturing through modular construction.
3Stability of the object's composition
If inner ring segments are sealed against each other using sealing plates, then flow channel integrity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The sealing function is extracted as a separate feature implemented through sealing plates that are attached to the inner ring segments. Rather than integrating sealing complexity into the main segment structure, the sealing plates are distinct components that can be manufactured and installed separately, simplifying the overall design while maintaining flow channel integrity.
Solution Approach 2:
Sealing plates act as intermediary elements between adjacent inner ring segments, providing the sealing function without requiring direct modification of the segments themselves. These plates facilitate the connection and sealing of segments while maintaining a simple segment design, reducing overall device complexity.
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
This approach effectively detunes cluster modes and reduces vibrations in guide vane segments, enhancing the operational behavior and efficiency of turbomachines by optimizing the arrangement and design of impulse bodies within the detuning areas.
Implementation Method 1
on and/or in a first detuning region (in the circumferential direction) of the inner ring segment (in the circumferential direction), which is located in the circumferential direction in a first section of the inner ring segment, which extends from a first end face of the inner ring segment (in the circumferential direction) to an inner vane which is a first outermost vane which is adjacent to the first end face (in the circumferential direction, in particular directly), and/or at most via a first outermost third, in particular quarter, in particular fifth, of the length of the inner ring segment (in the circumferential direction) delimited by one or the first end face of the inner ring segment (in the circumferential direction), extends, as well as on and/or in a second detuning region (opposite in the circumferential direction) of the inner ring segment (in the circumferential direction), which extends in the circumferential direction in a second section of the inner ring segment that is opposite the first section in the circumferential direction and extends from one of the first end faces in circumferential direction opposite second end face of the inner ring segment (in the circumferential direction) up to an inner guide vane, which is adjacent to the second end face (in the circumferential direction, in particular immediately) adjacent to the second outermost guide vane in the circumferential direction, in particular directly, and/or at most via a through one or the second end face of the inner ring segment (in the circumferential direction) limited second outermost third, in particular quarter, in particular fifth, of the length of the inner ring segment (in the circumferential direction), (each) one or more cavities are arranged, in which or which (each) one or more impulse bodies are arranged with play for impact contact
Data Source
Figure 1~2
AI summary
The present invention relates to a guide vane segment for a turbomachine stage, comprising an inner ring segment (10) and several guide vanes (21-25) arranged on the inner ring segment; wherein at least one cavity (112) is arranged on and/or in at least one detuning region (A; B) of the inner ring segment, which extends circumferentially in a section of the inner ring segment extending from an end face (11; 12) of the inner ring segment to an inner guide vane (22; 24) adjacent to an outermost guide vane (21; 25) adjacent to the end face, and/or extends at most over an outermost third of a length (L) of the inner ring segment bounded by an end face (11; 12) of the inner ring segment, in which at least one impulse body (100) with clearance for impact contact is arranged.