Compressor Spacer Rotation Breakaway Detection
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Solution Overview
Problem
Gas turbine engines face challenges in detecting rotation breakaway of compressor spacers relative to rotor disks, leading to potential damage and imbalance due to thermal expansion and contraction during transient operations, which existing angular motion detection systems do not adequately address.
Innovation Solution
A rotation breakaway detection system comprising a rotor sensor, spacer sensor, signal conditioner, offset determinator, memory, and outputter, which detect and condition signals to determine if the spacer is offset relative to the disk by comparing the timing of pulses from these sensors, and alert when a predetermined threshold is exceeded, preventing damage and imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing angular motion detection systems are used, then the system structure is simple, but the measurement precision for detecting spacer rotation breakaway is insufficient
Solution Approach 1:
The detection system is segmented into independent functional modules: rotor sensor, spacer sensor, signal conditioner, offset determinator, memory, and outputter. Each module performs a specific function in the detection process, allowing for precise measurement while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The signal conditioner acts as an intermediary between the sensor signals and the offset determinator. It conditions the raw sensor signals by adjusting timing alignment and filtering noise, enabling precise offset detection without requiring the sensors or processor to directly handle complex signal processing
2Reliability
If real-time detection of spacer offset is implemented, then the reliability of preventing compressor binding is improved, but the use of energy by the detection system increases
Solution Approach 1:
The detection system operates by periodically sampling the rotational positions of the spacer and rotor disk using sensors that detect features on rotating components. The system compares offsets at discrete time points during rotation cycles, achieving reliable detection without requiring continuous high-energy processing
Solution Approach 2:
The detection system utilizes the existing rotational motion of the compressor components themselves as the detection mechanism. The rotor sensor and spacer sensor passively detect features on the rotating components without requiring additional actuators or energy input, leveraging the natural operation of the compressor
3Measurement precision
If the detection system continuously monitors spacer and rotor disk positions, then the measurement precision is maintained, but the loss of time for signal processing increases
Solution Approach 1:
The signal conditioner performs preliminary signal processing by pre-aligning the timing of rotor and spacer sensor signals during normal operation. This preliminary timing adjustment and noise filtering is performed in advance, so that when offset detection is needed, the processed signals are ready for immediate comparison without requiring additional processing time
Solution Approach 2:
The system replaces complex mechanical measurement and processing mechanisms with electronic sensors and digital signal processing. The rotor sensor and spacer sensor electronically detect rotational positions, and the offset determinator electronically compares the signals, eliminating the need for mechanical linkages and reducing signal processing time
Data Source
AI summary
A system and method for detecting the rotation breakaway of a spacer from a compressor rotor disk are disclosed herein. The method includes detecting a disk sensed feature and a spacer sensed feature on the compressor rotor disk and the spacer respectively. The method also includes comparing the timing between the two to a predetermined threshold to determine whether the relative position of the spacer to the compressor rotor disk exceeds a predetermined amount. The predetermined amount may be selected to determine whether an imbalance, rubbing, or binding can occur in the gas turbine engine or to determine whether anti-rotation features have been broken.