Fuel-Cell Backup Lubrication for Windmilling Turbine Engines

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Solution Overview

Problem

Turbine engines face challenges in maintaining lubricant supply to rotating components during shutdown or windmilling conditions, leading to potential journal bearing failure due to inadequate lubrication, which can cause seizure and gearbox failure.

Innovation Solution

An auxiliary lubrication system powered by a fuel cell that converts hydrogen fuel into electricity to operate an electrical auxiliary pump, ensuring lubricant supply to rotating components even when the primary system fails or during windmilling, independent of propulsor direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the primary lubrication system is used during normal operation, then lubricant supply to rotating components is maintained, but the system fails to provide lubrication during shutdown or windmilling conditions

Engineering Contradiction:

Improvelubrication reliabilityVSAvoidoperational condition adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The lubrication system is divided into two independent subsystems: a primary lubrication system that operates during normal engine operation, and an auxiliary lubrication system that activates during shutdown or windmilling conditions. This segmentation allows each subsystem to be optimized for its specific operational context, ensuring reliable lubrication across all engine states.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The auxiliary lubrication system is pre-configured with an electrical pump and hydrogen fuel cell, ready to activate immediately when the primary system fails or during windmilling conditions. This preliminary preparation ensures that lubrication is maintained without interruption, preventing bearing seizure and gearbox failure.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If an auxiliary lubrication system is added to provide lubrication during shutdown, then protection against bearing seizure is improved, but device complexity increases

Engineering Contradiction:

Improvejournal bearing protectionVSAvoidlubrication system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The auxiliary lubrication system uses a hydrogen fuel cell to generate electricity that powers the electrical pump. This self-service approach eliminates the need for external power sources or complex control systems, reducing overall device complexity while maintaining reliable lubrication during shutdown conditions.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The hydrogen fuel cell serves multiple functions: it generates electricity for the auxiliary pump, provides a compact power source that integrates into the existing engine structure, and can potentially serve other electrical needs. This multi-functionality reduces the need for separate systems, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If lubrication is maintained during windmilling, then gearbox failure is prevented, but energy consumption increases

Engineering Contradiction:

Improvegearbox reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system replaces traditional mechanical pump systems with an electrical pump powered by a hydrogen fuel cell. This substitution allows for more efficient energy utilization during windmilling conditions, as the fuel cell can generate electricity on-demand based on actual lubrication needs, rather than continuously consuming mechanical energy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The auxiliary lubrication system activates periodically or on-demand during windmilling conditions rather than operating continuously. The controller monitors engine status and activates the electrical pump only when needed, reducing overall energy consumption while maintaining gearbox reliability during critical periods.

Inventive Principle:

Principle #19Periodic action

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 prevents journal bearing seizure and gearbox failure by continuously supplying lubricant to rotating components during shutdown or windmilling, enhancing turbine engine reliability and longevity.

Implementation Method 1

a fuel cell that converts hydrogen fuel into electricity to operate an electrical auxiliary pump

Methodology Applied

Scientific EffectFuel cell: Fuel Cell

Data Source

PatentUS12560101B2Lubrication system for a turbine engine

Publication Date: 2026.02.24 GE AVIO SRL

AI summary

A lubrication system for a turbine engine. The turbine engine includes a propulsor and one or more rotating components. The lubrication system includes a sump, a primary lubrication system, an auxiliary lubrication system, and a fuel system. The sump stores lubricant therein. The primary lubrication system supplies the lubricant from the sump to the one or more rotating components during normal operation of the turbine engine. The auxiliary lubrication system includes an auxiliary pump. The fuel system stores hydrogen fuel. The fuel system includes a fuel cell controller that generates electricity from the hydrogen fuel. The electricity powers the auxiliary pump when the propulsor is windmilling such that the auxiliary pump pumps the lubricant from the sump to the one or more rotating components.