Transient Stator Blade Control in Turbine Compressors
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Solution Overview
Problem
Turbomachines face transient phenomena during load variations due to fuel flow changes, leading to temperature distribution and mechanical stress issues, which existing control methods fail to adequately address.
Innovation Solution
A method for controlling the angular position of variable-pitch stator vanes in a low-pressure compressor, involving transient opening and closing of the vanes in response to fuel flow increases, with the degree of opening influenced by temperature and fuel flow rates, to stabilize the turbomachine during load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional stator blade control methods are used, then steady-state fuel consumption is optimized, but transient behavior during load variations deteriorates
Solution Approach 1:
The patent applies dynamics by making the stator blade pitch angle dynamically adjustable based on operating conditions. The control method transitions from static pitch angle control to dynamic control that responds to fuel flow rate changes, allowing the system to adapt blade positioning to transient load variations and maintain optimal performance throughout different operating states.
Solution Approach 2:
The patent implements preliminary action by anticipating transient effects before they occur. When fuel flow rate increases are detected, the system proactively adjusts the stator blade pitch angle to prevent undesirable transient phenomena such as temperature distribution issues and mechanical stresses, rather than reacting after problems arise.
2Power
If fuel flow rate is increased to meet target thrust, then power output is improved, but transient mechanical stresses increase
Solution Approach 1:
The patent applies preliminary anti-action by counteracting the harmful transient effects before they can cause damage. When fuel flow rate increases are detected, the system immediately adjusts the stator blade pitch angle to oppose the development of harmful temperature distribution patterns and mechanical stresses, thereby preventing rather than reacting to potential damage.
Solution Approach 2:
The patent utilizes parameter changes by modifying the stator blade pitch angle parameter in response to fuel flow rate changes. This parameter adjustment allows the system to maintain optimal aerodynamic and mechanical conditions during transient operation, preventing excessive mechanical stresses while achieving the desired power output.
3Loss of energy
If stator blade pitch angle is adjusted for steady-state optimization, then fuel efficiency is improved, but response to transient load changes deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring fuel flow rate and using this information to dynamically adjust the stator blade pitch angle. This closed-loop control system ensures that the blade positioning responds appropriately to transient load changes while maintaining fuel efficiency during steady-state operation, resolving the contradiction between optimization and responsiveness.
Data Source
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AI summary
The invention relates to a method of controlling the angular position of variable-pitch stator blades (32) arranged at the inlet of a compressor (8) of a turbomachine (2), characterized by the following action: during an increase in fuel flow, transient opening of the angular position of the stator blades (32).