Aircraft Nacelle Filter Purge System Design
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Solution Overview
Problem
Aircraft engine filters can become plugged with contaminants during operations in challenging environments, leading to increased maintenance costs and reduced engine performance due to the need for frequent bypass operations.
Innovation Solution
The aircraft nacelle incorporates a filter-purge system with a forward cruise inlet, a conduit, an inlet barrier filter, gills, and a filter-purge door. When the gills are closed and the filter-purge door is open, air flows through the filter to dislodge debris, preventing filter plugging and maintaining engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is used to protect the engine from contaminants, then engine protection is improved, but the filter becomes plugged quickly in challenging environments
Solution Approach 1:
The system reverses the normal air flow direction through the filter during purge operations. Air flows backward through the filter panels to dislodge and remove accumulated contaminants, thereby extending filter service life while maintaining engine protection during normal operation
Solution Approach 2:
The system periodically discards accumulated contaminants from the filter by reversing air flow to blow them out through the filter panels. This recovery process removes debris that would otherwise plug the filter, extending its operational life between maintenance events
2Productivity
If the bypass door is used to allow contaminated air to bypass the filter, then air flow to the engine is maintained, but engine wear increases and performance reduces
Solution Approach 1:
The system implements periodic filter purging operations at predetermined intervals or based on differential pressure thresholds. This periodic maintenance action prevents filter plugging that would otherwise force bypass operations, ensuring continuous clean air flow to the engine without compromising performance
Solution Approach 2:
The system uses differential pressure sensors to monitor filter loading and triggers purge operations when predetermined pressure thresholds are reached. This feedback mechanism ensures the filter is maintained within optimal performance parameters, preventing conditions that would require bypass operation
3Productivity
If the filter is bypassed multiple times during sustained operations, then air flow is maintained, but maintenance expenses increase
Solution Approach 1:
The system performs preliminary filter purging operations before the filter becomes completely plugged. By proactively reversing air flow at predetermined intervals or pressure thresholds, the system prevents filter failure that would require bypass operation and subsequent maintenance intervention
Solution Approach 2:
The system automatically purges the filter using reverse air flow without requiring external maintenance intervention. The purge operation is triggered automatically by differential pressure sensors or timing mechanisms, allowing the filter to self-maintain and extend service life without increasing maintenance expenses
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 filter-purge system effectively prevents filter plugging by using reverse air flow to dislodge contaminants, reducing maintenance needs and maintaining engine performance even in challenging environments.
Implementation Method 1
air from the filter-purge door flows from the inlet-barrier-filter compartment through the inlet barrier filter
Data Source
AI summary
An aircraft nacelle includes a forward cruise inlet, a forward-cruise-inlet conduit coupled to the forward cruise inlet and operable to supply air from the forward cruise inlet to an engine housed by the aircraft nacelle, an inlet barrier filter, an inlet-barrier-filter compartment coupled to the inlet barrier filter, a plurality of gills coupled between the inlet-barrier-filter compartment and the engine and operable to be in an open state and a closed state, a filter-purge door coupled to the inlet-barrier-filter compartment and operable to be in a closed state and an open state. When the plurality of gills are in the closed state and the filter-purge door is in the open state, air from the filter-purge door flows from the inlet-barrier-filter compartment through the inlet barrier filter.