Conductive Sheath Grounding for Gas Turbine Fan Blades
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As gas turbine fan blades have increased in size and weight, the use of insulating materials like polyurethane coatings and fabric wear pads has hindered electrical grounding, leading to static electric charge buildup, which existing grounding methods fail to effectively dissipate.
Innovation Solution
A conductive sheath is secured to the leading edge of an aluminum fan blade, with a grounding element connected to the blade root and rotor, utilizing an adhesive and insulating material to ensure a direct ground connection, allowing for efficient charge dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If insulating materials like polyurethane coatings and fabric wear pads are used on aluminum fan blades, then weight reduction and protection are improved, but electrical grounding capability deteriorates
Solution Approach 1:
The fan blade is segmented into distinct functional zones: the main blade body uses insulating materials for weight reduction and protection, while a specific grounding zone at the root interface is treated differently to enable electrical connection. This segmentation allows simultaneous achievement of weight reduction and grounding capability.
Solution Approach 2:
An intermediary grounding structure is introduced between the insulating blade coating and the conductive rotor hub. This intermediary component provides a conductive pathway through the insulating materials, enabling electrical grounding without compromising the protective coating system.
2Power
If larger fan blades are used to increase engine performance, then power output is improved, but static electric charge buildup increases
Solution Approach 1:
The grounding function is extracted as a separate, dedicated feature from the overall blade structure. A specific grounding element is provided that is distinct from the aerodynamic and protective blade surfaces,专门负责电荷导泄功能。
Solution Approach 2:
The grounding structure utilizes the blade's own rotational motion and contact with the rotor hub to automatically dissipate static charge. The system is self-activating through the natural operation of the fan blade rotation, requiring no external power or control systems.
3Reliability
If conductive materials are used for fan blades to enable grounding, then electrical grounding is improved, but weight reduction benefits are lost
Solution Approach 1:
The blade structure exhibits local quality differentiation: the majority of the blade surface maintains insulating properties for weight reduction, while a localized grounding zone at the root provides conductive properties. This localized approach achieves grounding without requiring the entire blade to be conductive.
Solution Approach 2:
The fan blade employs a composite structure combining insulating materials (polyurethane coating, fabric wear pads) with a conductive grounding element. This composite approach integrates materials with different electrical properties to simultaneously achieve weight reduction and electrical grounding capability.
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 solution effectively dissipates electrical charges from the fan blades, preventing static buildup and ensuring safe operation while maintaining weight reduction benefits.
Implementation Method 1
A conductive sheath is secured to the leading edge of an aluminum fan blade, with a grounding element connected to the blade root and rotor, allowing for efficient charge dissipation
Data Source
AI summary
A fan rotor (16) includes a fan blade (18) for use in a gas turbine engine includes a sheath (37) formed of a material that is more conductive than a main fan blade body. A grounding element (63) provides a grounding path from the sheath (37) into a rotor (16) receiving the fan blade (18).