Aircraft Engine Cooling Duct with Modulated Airflow Doors
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Solution Overview
Problem
Engine cooling systems for aircraft face challenges in maintaining optimal temperature ranges at varying altitudes and ground conditions, where undercooling or excessive heat rejection can adversely affect engine performance, requiring a compact system with adaptable thermal management.
Innovation Solution
An engine cooling system with a housing forming an enclosed duct containing heat exchangers and doors that can be modulated by a controller to adjust the mass flow rate of ambient air, ensuring the heat transfer maintains the temperature of fluids within the heat exchangers within a preferred range, suitable for aircraft, land, amphibious, marine, and submarine vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the intercooler undercools the charge air to the engine, then the charge air temperature is reduced, but the engine performance is adversely affected
Solution Approach 1:
The patent applies dynamics by making the air intake door and exhaust door movable and adjustable, allowing the system to adapt the mass flow rate of ambient air dynamically. This enables precise control over the cooling effect, preventing both undercooling and overheating of charge air, thereby maintaining optimal engine performance across varying operational conditions.
2Temperature
If the intercooler rejects excessive amounts of heat into the cooling air stream, then the charge air is cooled adequately, but the radiator would need to be oversized
Solution Approach 1:
The patent implements feedback control through the controller that monitors thermal conditions and adjusts the position of air intake and exhaust doors accordingly. This feedback mechanism optimizes heat rejection from the intercooler, preventing excessive heat transfer that would require an oversized radiator, while ensuring adequate charge air cooling.
3Adaptability or versatility
If the cooling system is designed for altitude operation, then the system works at high altitude, but the system cannot operate efficiently at low altitude or ground conditions
Solution Approach 1:
The patent applies dynamics by making the air intake door and exhaust door movable and adjustable, allowing the system to adapt the mass flow rate of ambient air dynamically. This enables precise control over the cooling effect, preventing both undercooling and overheating of charge air, thereby maintaining optimal engine performance across varying operational conditions.
Solution Approach 2:
The patent changes operational parameters by varying the mass flow rate of ambient air through the duct using adjustable doors. This parameter adjustment allows the same compact heat exchanger to function effectively across different altitudes and thermal rejection requirements, eliminating the need for oversized components designed for worst-case scenarios.
4Adaptability or versatility
If oversized components are used to handle divergent thermal rejection requirements, then the system can operate at both altitude and ground conditions, but the system becomes non-compact
Solution Approach 1:
The patent changes operational parameters by varying the mass flow rate of ambient air through the duct using adjustable doors. This parameter adjustment allows the same compact heat exchanger to function effectively across different altitudes and thermal rejection requirements, eliminating the need for oversized components designed for worst-case scenarios.
Solution Approach 2:
The patent applies universality by designing a single compact heat exchanger that can perform multiple functions across different operational conditions. By combining it with controllable air intake and exhaust doors, the system achieves versatility for both altitude and ground operations without requiring separate oversized components for each condition.
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 effectively maintains optimal engine temperatures across different operational conditions, preventing overheating or undercooling, thus enhancing engine performance and reducing the need for oversized components by dynamically adjusting air flow and heat transfer.
Implementation Method 1
ambient air entering the air intake opening flows through the duct to contact the at least one heat exchanger... to vary a heat transfer from the at least one heat exchanger to the ambient air in the duct
Data Source
AI summary
An engine cooling system may include a housing forming an enclosed duct having an air intake opening, an air intake door, an exhaust opening, and an exhaust door; at least one heat exchanger positioned within the duct such that ambient air entering the air intake opening flows through the duct to contact the at least one heat exchanger and exits the duct through the exhaust opening; and a controller connected to vary a degree that one or both of the air intake door and exhaust door is open to modulate a mass flow rate of ambient air contacting the at least one heat exchanger to vary a heat transfer from the at least one heat exchanger to the ambient air in the duct to maintain a temperature of a fluid within the at least one heat exchanger within a preferred temperature range.