Aircraft Heat Exchanger Cleanout System
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Solution Overview
Problem
Aircraft heat exchangers in harsh environments, such as sandy or dusty conditions, often become clogged with particulate matter, requiring frequent maintenance and complex procedures that are time-consuming and costly, as current methods necessitate disassembly and use of specialized equipment with limited effectiveness.
Innovation Solution
A cleanout system integrated with the exhaust plenum of the heat exchanger, featuring a passageway with an accessible inlet and outlet that allows for the directional flow of cleaning fluid to remove particulate without disassembling the heat exchanger, using built-in tubing with nozzles or sweeping jet fluidic actuators to efficiently direct cleaning fluid onto the heat exchanger's downstream side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat exchanger is disassembled for cleaning, then particulate removal is effective, but maintenance time and complexity increase
Solution Approach 1:
The cleanout passageway is pre-configured within the exhaust plenum structure, with the cleanout outlet positioned to directly access the heat exchanger outlet. This preliminary arrangement allows cleaning fluid to be immediately directed through the heat exchanger without requiring disassembly, thus maintaining effective particulate removal while significantly reducing maintenance time.
Solution Approach 2:
The cleanout passageway acts as an intermediary channel that connects the external cleaning fluid source to the heat exchanger interior. This intermediary structure enables the introduction of cleaning fluid directly into the heat exchanger passage without disassembly, effectively removing particulate while avoiding the time-consuming disassembly process.
2Reliability
If specialized ground service equipment is used, then cleaning capability is improved, but equipment complexity and cost increase
Solution Approach 1:
The exhaust plenum is equipped with a built-in cleanout system that includes a cleanout passageway and outlet positioned to access the heat exchanger. This self-service feature allows the heat exchanger to be cleaned using simple external equipment connected to the cleanout inlet, eliminating the need for complex specialized ground service equipment while maintaining effective cleaning capability.
Solution Approach 2:
The cleanout functionality is merged into the existing exhaust plenum structure by integrating the cleanout passageway within the plenum walls. This combination allows the exhaust plenum to serve dual purposes: exhaust function during operation and cleanout function during maintenance, thereby reducing overall equipment complexity and eliminating the need for separate specialized cleaning equipment.
3Ease of operation
If cleanout system is integrated into exhaust plenum, then maintenance accessibility is improved, but plenum structure complexity increases
Solution Approach 1:
The exhaust plenum is designed with multi-functionality by incorporating the cleanout passageway and outlet into its structure. This allows the plenum to serve both its primary exhaust function and a secondary cleanout function, improving maintenance accessibility without requiring a completely separate complex cleaning system.
Solution Approach 2:
The cleanout passageway is locally integrated into the exhaust plenum structure at specific positions where it is most effective for accessing the heat exchanger outlet. This localized integration provides the necessary maintenance accessibility while minimizing the overall structural complexity of the plenum, as only specific regions are modified rather than the entire structure.
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
Facilitates efficient and cost-effective maintenance by allowing cleaning of heat exchangers while remaining attached to the aircraft, reducing maintenance time and eliminating the need for specialized ground service equipment, thereby improving airflow efficiency and reducing maintenance complexity.
Implementation Method 1
The cleanout system includes a cleanout passageway to fluidly couple a cleanout inlet accessible from an outer surface of the exhaust plenum and a cleanout outlet in fluid communication with the heat exchanger outlet
Data Source
AI summary
Cleanout systems are disclosed. An example environmental control system includes an exhaust plenum to exhaust cooling fluid from a heat exchanger outlet of a heat exchanger, and a cleanout system coupled to the exhaust plenum adjacent the heat exchanger outlet. The cleanout system includes a cleanout passageway to fluidly couple a cleanout inlet accessible from an outer surface of the exhaust plenum and a cleanout outlet in fluid communication with the heat exchanger outlet. The cleanout system is to enable removal of particulate from the heat exchanger without disassembling the heat exchanger from the exhaust plenum or an air intake.