Three-State Engine Bypass Valve for Aircraft Airflow Control
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Solution Overview
Problem
The pressure loss introduced by valves in aircraft engines, which interact with multiple streams, affects the performance and efficiency of these engines, particularly limiting the potential of the third stream.
Innovation Solution
Incorporating a three-state/position valve configuration that allows for alternative airflow pathways and mixing scenarios, including bypassing certain fan stages, to minimize pressure loss and optimize stream interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a valve is used to control stream interactions in the engine, then the ability to generate multiple streams and control their mixing is improved, but pressure loss increases
Solution Approach 1:
The valve is configured to assume one of at least three states (fully open, partially open, fully closed), allowing dynamic adjustment of airflow paths. This enables the engine to optimize stream interactions and minimize pressure loss under different operating conditions, resolving the contradiction between adaptability and energy loss.
Solution Approach 2:
By changing the valve position parameter (between at least three discrete states), the system controls the degree of mixing between streams and adjusts pressure distribution. This parameter change allows optimization of both stream interaction capability and pressure loss characteristics.
2Loss of energy
If a traditional two-state valve is used, then the structure is simpler, but the ability to optimize stream interactions and minimize pressure loss is limited
Solution Approach 1:
The valve transitions from a static two-state design to a dynamic three-state design, enabling intermediate positions that optimize airflow control. This additional state provides finer control over stream interactions and pressure management without excessive complexity increase.
Solution Approach 2:
The three-state valve configuration provides multiple functions: full open for minimum pressure loss, partially open for optimized stream mixing, and fully closed for stream separation. This multi-functionality addresses various operating conditions within a single valve design.
Data Source
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AI summary
Aspects of the disclosure are directed to an engine 200 of an aircraft. The engine 200 may include a first fan 202 configured to output a first air flow, a second fan 204 configured to receive a first portion of the first air flow and output a second air flow, a core configured to receive a first portion of the second air flow and generate a first stream, and at least one valve 244 configured to assume one of at least three states in association with a generation of a second stream and a third stream based on at least one of the first air flow and the second air flow.