Turbine Stator Vane Fixing Grooves Prevent Circumferential Movement
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Solution Overview
Problem
The existing gas turbine design experiences vibration issues due to the circumferential movement of turbine vanes, leading to reduced efficiency as the turbine vane shroud allows only axial fixation, not circumferential, resulting in inefficient torque transmission and power generation.
Innovation Solution
A turbine stator design featuring a casing with fastening grooves and stops to fix vane airfoils and shrouds, utilizing flanges and fixing pins to secure the vanes in both axial and circumferential directions, preventing vibration and enhancing fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the turbine vane shroud allows axial movement fixation only, then the structure is simple and easy to manufacture, but the turbine vane can move circumferentially causing vibration and reduced efficiency
Solution Approach 1:
The fixing mechanism is divided into two independent components: the turbine vane shroud that provides axial fixation, and the separately installed stop that provides circumferential fixation. This segmentation allows each component to have a specialized function while maintaining manufacturing simplicity.
Solution Approach 2:
The stop acts as an intermediary component between the turbine vane shroud and the turbine casing. It mediates the circumferential movement constraint while allowing the axial fixation to remain simple, thus solving the contradiction between structural simplicity and movement control.
2Device complexity
If the turbine vane is not fixed circumferentially, then the structure remains simple, but vibration occurs due to circumferential movement reducing turbine efficiency
Solution Approach 1:
The fixing function is segmented into axial fixation (handled by the shroud) and circumferential fixation (handled by the stop). This segmentation adds minimal complexity while effectively preventing vibration and maintaining high turbine efficiency.
Solution Approach 2:
The stop is designed as a simple, inexpensive component that can be easily manufactured and installed. Its simplicity keeps the overall device complexity low while effectively solving the vibration problem that would otherwise reduce productivity.
3Reliability
If a complex fixation system is used to prevent circumferential movement, then vibration is reduced and efficiency improves, but the structure becomes more complex and manufacturing costs increase
Solution Approach 1:
The circumferential fixation function is extracted from the main turbine vane shroud structure and implemented as a separate, simple stop component. This extraction maintains the simplicity of the primary structure while adding only the minimum necessary element to prevent vibration.
Solution Approach 2:
Instead of making the entire fixation system complex to achieve both axial and circumferential fixation simultaneously, the invention inverts the approach by using a simple shroud for axial fixation and a separate simple stop for circumferential fixation, achieving the opposite of what a unified complex system would do.
Data Source
AI summary
A turbine stator, into which combustion gas supplied from a combustor of a gas turbine flows, has an improved structure capable of preventing circumferential movement of turbine vanes. The turbine stator, which may be included in a turbine of a gas turbine having the improved structure, includes a casing including first and second casings constituting respective casing halves, the first and second casings having a fastening groove formed on at least one contact surface between the first casing and the second casing; a plurality of vane airfoils configured to be installed on an inner peripheral surface of the casing and arranged in a multi-stage manner in a flow direction of the combustion gas; and a stop configured to be fixed with respect to a vane airfoil of the plurality of vane airfoils and to be inserted into the fastening groove to fix the vane airfoil to the casing.