Aircraft Hydrogen Leak Detection via Differential Pressure

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Solution Overview

Problem

Existing aircraft propulsion systems face challenges in effectively detecting and managing hydrogen leaks, which are critical for safety and efficient operation.

Innovation Solution

A hydrogen supply assembly with a leak detection system that includes interior and exterior pressure sensors and a controller, which determines differential pressure and identifies hydrogen leakage by comparing it to predefined thresholds, and includes a purge assembly to address leaks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If hydrogen storage and supply equipment is installed in aircraft propulsion systems, then hydrogen fuel capability is improved, but safety risks due to potential hydrogen leakage increase

Engineering Contradiction:

Improvehydrogen fuel capabilityVSAvoidsafety risks from hydrogen leakage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The leak detection system performs preliminary monitoring of differential pressure across the storage housing to detect hydrogen leakage before it becomes a critical safety issue. The system proactively identifies potential leaks by comparing interior and exterior pressure, enabling preventive action rather than reactive response.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements continuous feedback through pressure sensors that monitor the differential pressure between the storage plenum and ambient atmosphere. This feedback loop provides real-time information about the integrity of the hydrogen storage system, allowing the control system to respond dynamically to detected anomalies.

Inventive Principle:

Principle #23Feedback

2Quantity of substance

If complex storage and supply equipment is used for hydrogen, then hydrogen storage capability is improved, but system complexity increases

Engineering Contradiction:

Improvehydrogen storage capabilityVSAvoidstorage and supply equipment complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical leak detection methods with a simplified pressure differential measurement system. Instead of using elaborate sensors or complex monitoring mechanisms, the system uses basic pressure sensors to measure the difference between interior and exterior pressure, significantly reducing system complexity while maintaining effective leak detection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The differential pressure measurement system serves multiple functions: it monitors storage integrity, detects leaks, and provides data for safety control decisions. This multi-functional approach eliminates the need for separate specialized sensors or systems, reducing overall complexity while maintaining comprehensive monitoring capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If leak detection systems are implemented, then safety is improved, but detection precision requirements increase system complexity

Engineering Contradiction:

ImprovesafetyVSAvoiddifferential pressure measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system monitors changes in differential pressure parameters over time rather than requiring absolute precision at any single moment. By detecting trends and variations in pressure differential, the system can identify leaks with adequate precision using relatively simple sensors, without demanding high-precision measurement capabilities.

Inventive Principle:

Principle #35Parameter changes

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

The system effectively detects hydrogen leaks and initiates a purge when necessary, enhancing safety and operational efficiency by preventing hydrogen accumulation and potential hazards.

Implementation Method 1

The controller includes a processor in communication with a non-transitory memory storing instructions, which instructions when executed by the processor, cause the processor to determine a differential pressure between the storage plenum and the ambient atmosphere with the interior pressure sensor and the exterior pressure sensor

Methodology Applied

Scientific EffectPressure differential measurement:

Data Source

PatentUS12292007B2Hydrogen leak detection system for an aircraft propulsion system

Publication Date: 2025.05.06 PRATT & WHITNEY CANADA CORP

AI summary

A hydrogen supply assembly for an aircraft propulsion system includes a storage housing, a hydrogen supply component, and a leak detection system. The storage housing surrounds and forms a storage plenum. The hydrogen supply component is disposed within the storage housing coincident with the storage plenum. The leak detection system includes an interior pressure sensor, an exterior pressure sensor, and a controller. The interior pressure sensor is connected in fluid communication with the storage plenum. The exterior pressure sensor is connected in fluid communication with an ambient atmosphere outside the storage housing. The controller is configured to determine a differential pressure between the storage plenum and the ambient atmosphere with the interior pressure sensor and the exterior pressure sensor and identify a presence or an absence of hydrogen leakage from the hydrogen supply component to the storage plenum by comparing the determined differential pressure to a first differential pressure threshold.