Engine Intake Assembly with Selector Valve and Heat Exchanger
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Solution Overview
Problem
Compound engine assemblies, particularly supercharged or turbocharged ones, are bulky and difficult to integrate into existing aircraft nacelles, posing challenges for aircraft applications.
Innovation Solution
An intake assembly is designed with an air conduit containing heat exchangers, intake plenums, and selector valves to manage airflow and temperature, allowing for the selection of cooler or warmer air sources to optimize compressor performance and fit within constrained aircraft spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a compound engine assembly with supercharger or turbocharger is used, then engine performance is improved, but the assembly becomes bulky and difficult to fit into existing aircraft nacelles
Solution Approach 1:
The patent integrates the heat exchanger directly within the air conduit structure, nesting one component inside another to reduce overall assembly volume. The heat exchanger is positioned such that it occupies space within the existing air conduit pathway rather than adding external volume, allowing the compound engine assembly to fit into constrained aircraft nacelle spaces while maintaining performance-enhancing components
Solution Approach 2:
The heat exchanger is configured to extend across the air conduit in a manner that utilizes three-dimensional space efficiently. By having the heat exchanger extend across而非along the conduit, the design optimizes spatial utilization and reduces the footprint of the overall assembly, addressing the volume constraint while preserving power enhancement capabilities
2Power
If heat exchangers are added to cool airflow, then compressor performance is optimized, but device complexity increases
Solution Approach 1:
The heat exchanger is integrated directly into the air conduit structure, merging two previously separate components (heat exchanger and air conduit) into a single unified assembly. This integration reduces the number of separate parts, simplifies the overall device complexity, and eliminates the need for additional mounting hardware and connections while still providing the necessary cooling function to optimize compressor performance
Solution Approach 2:
The air conduit structure serves multiple functions: it guides airflow, provides structural support, and houses the heat exchanger. By making the air conduit multi-functional, the design avoids adding separate dedicated structures for each function, thereby reducing device complexity while achieving compressor performance optimization through effective air cooling
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 configuration enhances engine efficiency and adaptability by enabling efficient air management and temperature control, facilitating the integration of compound engine assemblies into aircraft nacelles while maintaining performance.
Implementation Method 1
an air conduit having at least one heat exchanger extending thereacross such that an airflow through the air conduit circulates through the at least one heat exchanger, each of the at least one heat exchanger configured to circulate a fluid to be cooled in heat exchange relationship with the airflow circulating therethrough
Data Source
AI summary
An engine assembly including an engine core including at least one internal combustion engine each including a rotor sealingly and rotationally received within a respective internal cavity to provide rotating chambers of variable volume in the respective internal cavity, a compressor having an outlet in fluid communication with an inlet of the engine core, a first intake conduit in fluid communication with an inlet of the compressor and with a first source of air, a second intake conduit in fluid communication with the inlet of the compressor and with a second source of air warmer than the first source of air, and a selector valve configurable to selectively open and close at least the fluid communication between the inlet of the compressor and the first intake conduit. A method of supplying air to a compressor is also discussed.