Gas Turbine Variable Stator Vane Actuation
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Solution Overview
Problem
Gas turbine engine variable stator vane designs face challenges in achieving aerodynamic efficiency across multiple angular positions, leading to compromises in design that affect performance in avoiding stall or surge conditions.
Innovation Solution
A variable stator stage with a combination of fixed and retractable vanes, where a common actuator is used to move multiple vanes between extended and retracted positions along a non-linear path, allowing for improved flow management within the engine's core flow path, and utilizing hydraulic or fuel hydraulic systems for actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a variable stator airfoil is designed to be aerodynamically efficient in more than one angular position, then aerodynamic efficiency is improved, but design compromises must be made that affect performance in avoiding stall or surge conditions
Solution Approach 1:
The stator vane assembly is segmented into multiple independent vanes that can be selectively retracted or extended. Each vane can be independently positioned, allowing the system to optimize aerodynamic efficiency for specific operating conditions while maintaining reliable stall and surge avoidance through the fixed vanes that remain in position.
2Device complexity
If multiple vanes are controlled by a common actuator, then device complexity is reduced, but precision of individual vane control may be compromised
Solution Approach 1:
Multiple vanes are merged into a single operational unit controlled by a common actuator. The actuator simultaneously moves multiple vanes along their respective non-linear paths, reducing the overall number of actuators required while maintaining sufficient control precision through the mechanical linkage and synchronized motion design.
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 configuration enhances aerodynamic efficiency by allowing for precise control of airflow, reducing the risk of stall and surge conditions, and optimizing performance across various operational angles.
Implementation Method 1
the actuator assembly includes one of a hydraulic or fueldraulic system configured to move the vane
Data Source
Figure 1
Figure 2
Figure 3A~5
AI summary
A gas turbine engine (20) includes a stator stage (74a) arranged in a core flow path (C) that includes a vane (60) that is configured to be retractable from the core flow path (C) during engine operation.