AC Filter Screen Prevents Engine Deposits via Dielectrophoresis
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Solution Overview
Problem
Increased fuel temperatures in aircraft engines lead to excessive formation of carbonaceous deposits on engine components, causing operational issues such as sluggish response, reduced power, and in-flight shut-downs, which conventional methods like additive packages and electrostatic cleaners are unable to effectively prevent due to weight, volume, and control limitations.
Innovation Solution
An alternating current (AC) source is electrically connected to engine components to create an electric field of alternating polarity, subjecting particles in the fuel and/or lubricant to dielectrophoresis, preventing deposits from forming on engine components, particularly in fuel and lubricant filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel temperature is increased to meet future aircraft heat load requirements, then cooling capability is improved, but carbonaceous deposit formation increases exponentially
Solution Approach 1:
The patent applies periodic alternating current (AC) voltage to the filter screen, causing the electric field polarity to alternate continuously. This periodic action prevents carbonaceous particles from adhering to the screen by reversing the electrostatic attraction before deposits can form, allowing operation at higher temperatures without exponential increase in deposit formation
Solution Approach 2:
The patent replaces conventional mechanical or chemical deposit prevention methods (such as additive packages or electrostatic oil cleaners) with an electrical field-based system. By applying AC voltage to create an electric field, the system uses electromagnetic forces rather than mechanical cleaning or chemical additives to prevent deposit formation
2Object-generated harmful factors
If additive packages or electrostatic cleaners are used to prevent deposit formation, then deposit prevention is improved, but system weight and volume increase
Solution Approach 1:
The patent makes the filter screen serve multiple functions: it simultaneously filters fuel and generates an electric field for deposit prevention. By integrating the electrostatic charge generation directly into the existing filter screen structure, the system eliminates the need for separate additive delivery systems or electrostatic cleaner devices, reducing overall system weight and volume
Solution Approach 2:
The patent combines the filtering function and deposit prevention function into a single integrated component. The filter screen is electrically connected to an AC source, merging the mechanical filtration role with the electrostatic deposit prevention role, thereby eliminating the need for separate chemical additives or additional cleaning equipment
3Object-generated harmful factors
If additive packages or large electrostatic cleaner systems are used, then deposit removal capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential function of deposit prevention from complex external systems (additive packages or large electrostatic cleaners) and implements it through a simple AC voltage connection to the existing filter screen. This extraction simplifies the system by removing unnecessary complexity while retaining the core deposit prevention capability
Solution Approach 2:
The filter screen serves itself by generating the electric field needed for deposit prevention through its own electrical connection to an AC source. The system uses the existing filter screen infrastructure to provide both filtration and electrostatic deposit prevention, eliminating the need for separate complex control systems or additional mechanical cleaning components
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 method effectively prevents deposit formation on engine components, even at higher fuel temperatures, improving engine efficiency and reducing the risk of plugging and degradation, allowing for the use of fuel and lubricants as coolants.
Implementation Method 1
an alternating current (AC) source electrically connected to the engine component to create an electric field of alternating polarity to subject particles within the fuel and/or lubricant to dielectrophoresis
Data Source
AI summary
A fuel and/or lubricant system for an engine can include an engine component configured to be in fluid communication with the fuel and/or lubricant, and an alternating current (AC) source electrically connected to the engine component to create an electric field of alternating polarity to subject particles within the fuel and/or lubricant to dielectrophoresis as the fuel and/or lubricant passes through the electric field to prevent deposits from forming on the engine component. In certain embodiments, the engine component can be a filter screen configured to filter the fuel and/or lubricant to subject particles within the fuel and/or lubricant to dielectrophoresis as the fuel and/or lubricant passes through the filter screen.