Aircraft Engine Fuel Leak Detection via Twin-Engine Comparison
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Solution Overview
Problem
Current methods for detecting fuel leaks in aircraft engine oil circuits are inadequate as they rely on monitoring consequences rather than direct detection, are sensitive to aircraft operating conditions, and require complex and costly sensors, leading to potential false alarms and undetected leaks.
Innovation Solution
A method that uses pressure and temperature measurements from identical engines to detect operating differences, allowing for early and accurate identification of fuel leaks without reconfiguring the engines, using existing sensors and processing external to the engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated sensors are used to detect fuel leaks, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses copies of existing engines (twin-engine configuration) and their existing sensors to detect leaks. Instead of installing dedicated leak detection sensors, the system copies the measurement approach from one engine to another, using the second engine's sensors to infer the state of the first engine's oil circuit. This eliminates the need for complex dedicated sensors while maintaining detection capability.
Solution Approach 2:
The patent introduces an intermediary approach by using the second engine's oil circuit as a reference system to detect leaks in the first engine's oil circuit. The comparison between the two engines' parameters (pressure, temperature, flow rate) serves as an intermediary method to indirectly detect fuel leaks without requiring direct sensing in the contaminated circuit.
2Measurement precision
If fluid level monitoring is used to detect fuel leaks, then leak detection is enabled, but false alarms increase due to sensitivity to operating conditions
Solution Approach 1:
The patent implements feedback by continuously monitoring multiple parameters (pressure, temperature, flow rate) from both engines and comparing them against each other and against reference values. The system uses feedback loops to adjust detection thresholds based on operating conditions, reducing false alarms while maintaining leak detection accuracy. The comparison between twin engines provides mutual feedback to distinguish actual leaks from normal operational variations.
Solution Approach 2:
The patent changes from monitoring a single parameter (fluid level) to monitoring multiple parameters (pressure, temperature, flow rate) simultaneously. By analyzing the combined information from multiple parameters and comparing them between twin engines, the system can distinguish between normal operating condition variations and actual fuel leaks, significantly reducing false alarm rates.
3Measurement precision
If complex detection systems are implemented, then detection accuracy is improved, but ease of operation and installation are reduced
Solution Approach 1:
The patent applies self-service by utilizing the existing sensors and oil circuits of twin engines to perform leak detection. The second engine's system serves the dual purpose of its own operation and detecting leaks in the first engine, eliminating the need for additional dedicated detection equipment. This approach maintains high detection accuracy while simplifying installation and operation, as no extra components need to be installed.
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 approach simplifies leak detection, reduces false alarms, and confirms leaks through additional volume measurements, enhancing the robustness of the detection process while avoiding costly sensor installations and material reconfiguration.
Implementation Method 1
the temperature of the fluid (a mixture of oil and fuel) then contained in the oil circuit increases, and therefore cools the engine less well
Implementation Method 2
the oil circuit also has the function, via said oil circulation and its physio-chemical aspects, of regulating the temperature of the elements of the engine set in motion during the operation of the aircraft, particularly rolling-element bearings
Implementation Method 3
These exchangers are of the oil-fuel type, so that the oil circuit is in contact with the fuel circuit of the engine. Thus, the oil is cooled by the fuel
Data Source
AI summary
The invention relates to a method for detecting a possible fuel leak into an oil circuit of an aircraft engine, the aircraft including at least one pair of identical engines equipped with respective oil circuits, the pair of engines being associated with at least one quadruplet of measurements previously acquired in a measurement time during the operation of the engines of the pair and corresponding to a measurement of pressure and a measurement of temperature of the fluid contained in each of the oil circuits of the engines of the pair.