Aircraft Nacelle Lip Heating Control for Lower Ice Protection Power

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Solution Overview

Problem

Aircraft ice protection systems face challenges in efficiently managing ice buildup on engine nacelles, particularly due to high power consumption and reduced lifetime of resistive heating elements, which are not optimally controlled based on operating conditions.

Innovation Solution

The system employs resistive heating elements and a controller to selectively apply heat to specific zones of the nacelle lip based on current operating conditions, reducing the duty cycle where icing is less likely and increasing the lifetime and power efficiency of the heating elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If resistive heating elements are continuously operated to protect against ice buildup, then ice protection is maintained, but power consumption increases and element lifetime decreases

Engineering Contradiction:

Improveice protection effectivenessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts heating element operation based on real-time operating conditions (engine power setting, airspeed, temperature). The controller modifies heating duty cycle according to flight phase, providing full heating only when icing conditions are most likely (low power settings, low airspeed) and reducing or eliminating heating when conditions are favorable (high power settings, high airspeed), thereby optimizing the balance between protection effectiveness and power consumption

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The heating elements are operated periodically rather than continuously, with duty cycles adjusted based on operating conditions. The system uses intermittent heating bursts to prevent ice accumulation during critical phases while allowing periods without heating when protection is less critical, reducing overall power consumption while maintaining adequate protection

Inventive Principle:

Principle #19Periodic action

2Reliability

If resistive heating elements are continuously operated to protect against ice buildup, then ice protection is maintained, but element lifetime decreases

Engineering Contradiction:

Improveice protection effectivenessVSAvoidheating element lifetime

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system applies heating in advance during phases where icing is most likely to occur (low power settings, low airspeed, high angle of attack conditions) before ice accumulation becomes problematic. By proactively preventing ice buildup during critical phases rather than reacting to established ice conditions, the system reduces the need for prolonged or repeated heating cycles, extending element lifetime

Inventive Principle:

Principle #10Preliminary action

3Reliability

If heating is applied to all zones of the nacelle lip, then comprehensive ice protection is achieved, but power consumption increases

Engineering Contradiction:

Improveice protection coverageVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The nacelle lip is divided into multiple heating zones (e.g., upper surface zones, lower surface zones, leading edge zones) that can be independently controlled. The controller selectively activates only the zones most susceptible to icing based on current flight conditions, such as activating upper surface zones during high angle of attack conditions or lower surface zones during sideslip conditions, rather than heating the entire lip uniformly, thereby reducing overall power consumption while maintaining protection where needed

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system applies different heating strategies to different zones of the nacelle lip based on their specific icing susceptibility and exposure to oncoming airflow. Each zone receives heating tailored to its local conditions and risk profile, with higher heating duty cycles applied to zones most prone to ice accumulation and lower or zero heating to zones less susceptible, optimizing the balance between comprehensive protection and power consumption

Inventive Principle:

Principle #3Local quality

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 extends the operational life of heating elements and reduces power draw by targeting heating based on real-time conditions, enhancing the overall efficiency and reliability of ice protection systems.

Implementation Method 1

The system employs resistive heating elements and a controller to selectively apply heat to specific zones of the nacelle lip

Methodology Applied

Scientific EffectResistive heating: Joule Heating

Data Source

PatentUS11975847B2Ice protection systems for aircraft

Publication Date: 2024.05.07 GENERAL ELECTRIC CO

AI summary

An ice protection system for an external surface for an aircraft. The external surface is configured to have air flow over the external surface and has a plurality of zones. At least one heat source is thermally coupled to the external surface in each zone of the plurality of zones. A controller is configured to selectively control the at least one heat source in each zone of the plurality of zones based on an operating condition related to the air flowing over the external surface.