Aircraft Heat Exchanger Leak Detection via Secondary Air Temperature
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Solution Overview
Problem
Current leak detection systems in aircraft air circuits do not allow for predictive maintenance, leading to unplanned downtime when leaks become significant.
Innovation Solution
A method and system for monitoring the state of a heat exchanger in an aircraft air circuit by acquiring temperature measurements when the circuit is supplied by a secondary hot air source, selecting a relevant measurement, comparing it to an alert threshold, and evaluating the leak level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leak detection loop with sensors is used to detect hot air leaks, then aircraft safety is improved by preventing damage from significant leaks, but the system cannot anticipate maintenance needs and leads to unplanned downtime
Solution Approach 1:
The system performs preliminary monitoring of temperature variations in the air circuit to detect early signs of exchanger degradation before significant leaks occur. By continuously acquiring temperature data and comparing it to reference values, the system anticipates maintenance needs and schedules repairs during planned maintenance windows, preventing unplanned downtime while maintaining safety.
2Measurement precision
If temperature measurements are continuously monitored to detect leaks, then leak detection accuracy is improved, but the complexity of the monitoring system increases
Solution Approach 1:
The system uses existing temperature sensors already present in the air circuit for their primary temperature regulation function to also serve leak detection purposes. By reusing the same sensors and infrastructure for dual purposes, the system achieves accurate leak detection without adding significant complexity, as the temperature measurement capability already exists in the circuit.
3Reliability
If the PRV valve is closed to isolate the hot air source upon leak detection, then aircraft safety is improved by preventing damage, but the air circuit becomes non-operational requiring aircraft grounding
Solution Approach 1:
The system performs preliminary detection and monitoring of temperature variations to identify exchanger degradation trends before critical failures occur. By anticipating the need for maintenance through continuous monitoring and comparison with reference values, the system allows operators to schedule repairs during planned maintenance periods, keeping the aircraft operational and avoiding grounding while still ensuring safety through early warning.
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
Enables prediction of leak levels and anticipation of exchanger removal during scheduled maintenance, preventing unplanned aircraft downtime.
Implementation Method 1
the heat exchanger being intended to cool the air extracted from a main hot air source of the aircraft
Implementation Method 2
acquisition of the temperature measurements taken by a probe disposed at an outlet of said heat exchanger
Data Source
AI summary
A method and a system are provided for monitoring the state of a heat exchanger (17) in an air circuit (5) of an aircraft (7), the heat exchanger being intended to cool the air extracted from a source of a main hot air source of the aircraft. An acquisition module (11) is configured to acquire temperature measurements taken by a probe disposed at an outlet of said heat exchanger, the acquisition being carried out when the air circuit is supplied by a secondary hot air source downstream of the heat exchanger and the main hot air source being turned off. A processor (9) is configured to select a relevant temperature measurement from the temperature measurements and to detect a possible leak in the heat exchanger (17) by comparing the relevant temperature measurement to a predetermined alert threshold.