Rotating Stall Detection in Turbojet Compressors
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Solution Overview
Problem
Turbojet engines of small size, particularly those used in business aviation, are prone to rotating stalls due to their compact size and architecture, leading to inefficiencies and potential overheating issues, which existing detection methods struggle to reliably identify in a timely manner.
Innovation Solution
A method and device that detect rotating stalls by monitoring variations in static pressure and exhaust gas temperature, using a counter to quantify noise in static pressure signals and comparing these against thresholds, combined with EGT temperature measurements to accurately identify the presence of a rotating stall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating stall detection method is implemented, then the reliability of detecting rotating stalls is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple detection parameters (static pressure variations and exhaust gas temperature) into a unified detection method. The determination module integrates pressure signal analysis with temperature threshold comparison, merging what would otherwise be separate detection systems into a single coordinated approach that improves reliability without proportionally increasing complexity.
Solution Approach 2:
The detection device is designed to monitor multiple parameters simultaneously using existing engine sensors. The static pressure sensor and temperature sensor serve dual purposes: normal engine monitoring and rotating stall detection. This multi-functionality approach allows the system to detect rotating stalls without adding dedicated detection hardware, thereby improving reliability while minimizing complexity increase.
2Reliability
If early detection of rotating stalls is achieved, then the prevention of engine failure is improved, but the measurement precision requirements increase
Solution Approach 1:
The system performs preliminary monitoring of static pressure variations and temperature trends before a rotating stall fully develops. By continuously analyzing pressure signal deviations and comparing temperature against thresholds during the engine start-up phase, the system can detect early signs of rotating stall and trigger preventive actions before engine failure occurs, improving reliability without requiring ultra-precise measurements.
Solution Approach 2:
The detection method uses feedback from continuous monitoring of pressure and temperature parameters. The determination module receives real-time data from sensors and dynamically adjusts detection sensitivity based on operating conditions. This feedback mechanism allows the system to maintain appropriate measurement precision thresholds adaptively, improving early detection capability while avoiding the need for consistently high-precision measurements across all operating regimes.
Data Source
AI summary
A method for detecting a rotating stall includes: determining a level of variation of a static pressure in a combustion chamber of the turbojet engine around an average value of this static pressure; comparing the level of variation of the static pressure relative to a first threshold; comparing a temperature measured at the outlet of a turbine of the turbojet engine relative to a second threshold; and if the level of variation of the static pressure is greater than the first threshold and the temperature at the outlet of the turbine is greater than the second threshold, detecting a presence of a rotating stall.