Aircraft Tail Fuel Cell Layout With Distributed Thermal Management

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Solution Overview

Problem

Existing aircraft power train systems lack efficient and optimized layouts for fuel cells, particularly in multi-engine electric motor-driven propeller aircraft, which are essential for transitioning from thermal engines to electric propulsion.

Innovation Solution

A fuel cell and power train system is mounted at the tail section of an aircraft fuselage, comprising port and starboard subsystems with nacelles, electric motors, propeller assemblies, and fuel cells, along with hydrogen tanks and radiator heat exchangers, optimizing space and integrating thermal management systems.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If fuel cells are installed in the tail section of the aircraft, then space utilization is optimized and cabin noise is reduced, but the complexity of thermal management system increases

Engineering Contradiction:

Improvespace utilizationVSAvoidthermal management system complexity

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The thermal management system is segmented into multiple independent radiator heat exchangers distributed throughout the aircraft structure. Each heat exchanger handles thermal loads from specific fuel cell modules, allowing modular installation and maintenance while optimizing space utilization in the tail section.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The radiator heat exchangers are integrated into the existing aircraft structure, nesting thermal management components within the fuselage and wing structures. This approach optimizes space utilization by using existing structural volumes rather than adding separate external thermal management systems.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Loss of energy

If multiple radiator heat exchangers are distributed throughout the aircraft, then thermal management efficiency is improved, but the device complexity increases

Engineering Contradiction:

Improvethermal management efficiencyVSAvoidnumber of heat exchangers

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The distributed radiator heat exchangers serve multiple functions: they manage thermal loads from fuel cells, provide structural reinforcement to the aircraft, and can be integrated with existing aircraft systems. This multi-functionality reduces the need for separate dedicated thermal management components, offsetting the complexity of having multiple heat exchangers.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If fuel cells are positioned in the tail section, then cabin noise is reduced and space is optimized, but accessibility for maintenance becomes more difficult

Engineering Contradiction:

Improvecabin noiseVSAvoidmaintenance accessibility

Core Design Contradiction:

Object-affected harmful factorsVSEase of repair

Solution Approach 1:

The fuel cell system is divided into modular units positioned in the tail section, with each module independently accessible through dedicated maintenance panels and access points. This segmentation allows maintenance personnel to service individual modules without requiring complete disassembly of the tail section, improving accessibility while maintaining noise reduction benefits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Flexible service conduits and intermediate access chambers are provided between the tail section fuel cells and the external environment, allowing maintenance personnel to access and service fuel cell components without direct exposure to the confined tail section workspace, thereby improving maintenance accessibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 layout allows for compact installation of fuel cells with minimal impact on aircraft profile, reduced cabin noise, and efficient thermal management, enabling dual propeller operation.

Implementation Method 1

at least one fuel cell positioned in the tail section of the fuselage to supply electrical power to the electric motor

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Implementation Method 2

first and second radiator heat exchangers positioned throughout the aircraft structure

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Implementation Method 3

each of the fuselage radiator heat exchanger and the nacelle radiator heat exchanger may include a respective fan operatively mounted in the tail section of the fuselage and the nacelle

Methodology Applied

Scientific EffectForced convection: Forced Convection

Data Source

PatentUS12377995B2Aircraft tail mounted fuel cell power train and thermal management systems

Publication Date: 2025.08.05 EMBRAER SA

AI summary

Fuel cell and power train (FCPT) systems are provided and adapted to being operatively mounted at a tail section of an aircraft fuselage. The FCPT systems will include port and starboard subsystems each being comprised of a nacelle adapted to being laterally attached to a respective side of the tail section of the fuselage, an electric motor contained in the nacelle, a propeller assembly mounted to the nacelle and operatively connected to and adapted to be driven by the electric motor contained therein, and at least one fuel cell positioned in the tail section of the fuselage to supply electrical power to the electric motor contained in the nacelle. One or more hydrogen fuel tanks may be mounted within the tail section of the fuselage to provide a source of hydrogen gas (H2) as fuel to the fuel cells.