Split Actuation Variable Stator Vanes for Compressor Stability
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Solution Overview
Problem
Traditional variable stator vane systems in turbomachines actuate all vanes in a compressor stage uniformly, which can lead to inefficiencies when dealing with non-uniform air flow conditions caused by distorted inlets, potentially resulting in surge and stall conditions.
Innovation Solution
Implementing a split actuation system where different variable stator vanes in a compressor stage are actuated according to separate schedules, allowing for distinct vane angles to be set for different locations along the circumference to accommodate non-uniform air flow, using a combination of actuators and linkage structures such as split actuation rings and levers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all variable stator vanes are actuated uniformly according to a single schedule, then the actuation system is simple, but compressor stability deteriorates under non-uniform air flow conditions
Solution Approach 1:
The actuation system is divided into multiple independent actuation assemblies, each controlling a specific sector of variable stator vanes. Each actuation assembly includes its own actuator and linkage structures, allowing different schedules to be applied to different vanes. This segmentation enables tailored control for different airflow conditions while maintaining manageable system complexity through modular design.
Solution Approach 2:
Different variable stator vanes are actuated according to different schedules based on their local position in the compressor stage. The system applies local quality control by allowing each vane or vane group to have optimized angles specific to its location and the local airflow conditions, rather than forcing uniform actuation across all vanes.
2Productivity
If variable stator vanes are actuated to different angles according to different schedules, then efficiency under non-uniform flow improves, but the actuation mechanism becomes more complex
Solution Approach 1:
The compressor stage is divided into multiple sectors, each with its own actuation assembly that can independently control the variable stator vanes in that sector. This segmentation allows each assembly to optimize vane angles for its specific sector's airflow conditions, improving overall compressor efficiency while keeping each individual actuation mechanism relatively simple and manageable.
Data Source
AI summary
Example variable geometry systems with split actuation are disclosed herein. In one example, a compressor is provided that includes a compressor stage and an actuation system. The compressor stage includes a plurality of variable stator vanes arranged along a circumference of the compressor stage. The actuation system is to actuate a first variable stator vane of the compressor stage according to a first schedule and to actuate a second variable stator vane of the compressor stage according to a second schedule.