Multi-element Propeller Blade Deicer for Balanced Three-Phase Loads
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Solution Overview
Problem
Conventional propeller deicing systems face challenges in achieving balanced three-phase electrical loads, particularly for propellers with odd numbers of blades, leading to uneven power distribution and potential vibration issues, as well as inefficiencies in minimizing peak power demand during ice protection.
Innovation Solution
A multi-element propeller blade deicer system that creates radial deicing zones based on the radial location of heating elements, using multiple power feeds to balance the electrical load across three phases of a three-phase AC power generation system, with resistive circuits designed to ensure balanced power distribution and efficient deicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional propeller deicing systems are used, then ice protection is provided, but balanced three-phase electrical loads cannot be achieved leading to uneven power distribution and vibration issues
Solution Approach 1:
The propeller blades are divided into multiple deicing zones (first deicing zone and second deicing zone) with separate heating elements. This segmentation allows independent control of heating in different radial portions of each blade, enabling balanced distribution of electrical loads across three phases by selectively activating specific zones on different blades.
Solution Approach 2:
Different portions of the propeller blades are equipped with different heating elements (first plurality for first deicing zone, second plurality for second deicing zone) with potentially different resistance values. This local differentiation allows tailoring the electrical characteristics of each zone to achieve overall balance in the three-phase electrical system while providing targeted ice protection where needed.
2Reliability
If conventional deicing systems are used, then ice accumulation is prevented, but peak power demand is not minimized
Solution Approach 1:
The deicing system operates by periodically activating different deicing zones in a cyclic manner rather than continuously powering all zones. The controller alternates between first and second sets of heating elements across multiple cycles, which distributes the peak power demand over time and reduces the instantaneous power requirements while maintaining effective ice protection.
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 achieves balanced power load and weight-balanced deicing, reducing peak power requirements and minimizing vibration, while effectively preventing ice accumulation on propeller blades.
Implementation Method 1
Electro-thermal systems use resistive circuits that are disposed within a particular component and that generate heat when a current passes through the resistive circuits. The heat causes the reduction and/or prevention of the accumulation of ice.
Data Source
AI summary
Provided are embodiments for deicing an aircraft propeller having a plurality of blades of an aircraft. An example method includes performing a first heating, by a first plurality of heating elements connected to a first portion of each of the plurality of blades, for a first period of time, the first portion of each of the plurality of blades of the propeller defining a first deicing zone. The method further includes, subsequent to expiration of the first period of time, performing a second heating, by a second plurality of heating elements connected to a second portion of each of the plurality of blades, for a second period of time, the second portion of each of the plurality of blades of the propeller defining a second deicing zone.