Gas Turbine Valve State Detection via Pressure Differential
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Solution Overview
Problem
Existing gas turbine engine valve monitoring systems face challenges in accurately determining the state and operability of valves, particularly in cold environments or high-altitude conditions, where ice formation can affect compressor components, and existing systems struggle to differentiate between stuck open or closed valves, leading to potential operational disruptions.
Innovation Solution
A system that uses pressure sensors and a controller to determine the state of a valve by comparing pressures at different locations within the gas turbine engine, allowing the valve to move between positions and monitoring pressure changes to assess its operability, thereby detecting whether the valve is closed, partially open, or substantially open, and declaring fault conditions if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors and controllers are used to monitor valve state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical valve position indicators with a pressure-based detection system. Pressure sensors monitor pressure differentials across the valve to infer valve state, substituting direct mechanical measurement with indirect pressure-based sensing. This allows accurate valve state detection without complex mechanical linkages or visual indicators.
Solution Approach 2:
The patent introduces pressure as an intermediary parameter to determine valve state. Instead of directly measuring valve position, the system measures pressure differentials caused by valve position changes. The controller acts as an intermediary that processes pressure sensor signals to deduce valve state, enabling indirect but accurate monitoring.
2Reliability
If the system monitors pressure changes to determine valve operability, then reliability is improved, but use of energy increases
Solution Approach 1:
The system uses the existing pressure differential that naturally exists during engine operation to monitor valve state. The engine's own operating conditions create the pressure signals needed for detection, eliminating the need for external power sources or additional actuators. The valve's normal operation generates the measurement signals automatically.
Solution Approach 2:
The controller continuously monitors pressure sensor outputs and compares them against expected values for proper valve operation. When pressure differentials deviate from expected ranges, the system detects potential valve failures. This closed-loop feedback enables reliable operability monitoring using minimal additional energy.
3Measurement precision
If the system checks valve state at multiple positions, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The pressure monitoring system operates continuously during engine operation, constantly tracking pressure differentials rather than performing discrete periodic checks. This continuous measurement approach provides ongoing valve state verification without requiring the engine to pause or slow down, eliminating time loss while maintaining high measurement precision through sustained data collection.
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 solution enables precise monitoring of valve states and operability, preventing ice formation by ensuring the anti-icing system functions correctly, reducing the risk of operational disruptions and maintaining engine efficiency by accurately identifying valve failures or malfunctions.
Implementation Method 1
determine a first pressure of a fluid flow at a first location within a gas turbine engine; determine a second pressure of a compressed fluid at a second location within the gas turbine engine
Data Source
AI summary
A valve monitoring apparatus has a system to determine a state of a valve. The system determines a fluid flow first pressure at a first location within a gas turbine engine, and a second pressure of a compressed fluid at a second location within the engine when the valve is in the first position; and compares the first and second pressures to determine the valve state. The system is arranged to command the valve to move from the first position towards a second position; determine the second pressure of the compressed fluid at the second location; compare the pressure at the second location when the valve is in the first position to the pressure at the second location when the valve has been commanded to move towards the second position; and, determine whether the valve has moved from the first position towards the second position when commanded to do so.