Aircraft Engine Recuperator Bypass for High Power Demand
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Solution Overview
Problem
Aircraft engines with recuperators face inefficiencies during high power demands, particularly when one engine becomes inoperative, leading to increased pressure loss and limited power output due to the recuperator's pressure drop.
Innovation Solution
Incorporating a closure mechanism in the aircraft engine that automatically opens a bypass outlet when a pressure drop threshold is exceeded, allowing compressed air to bypass the recuperator, thereby maintaining power output by minimizing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the recuperator is used to transfer heat from combustion gases to compressed air, then fuel efficiency is improved, but pressure loss increases during high power demand situations
Solution Approach 1:
The closure is designed to dynamically switch between closed and open positions based on operating conditions. During normal operation, the closure remains closed to enable heat exchange through the recuperator, improving fuel efficiency. During high power demand situations, the closure automatically opens to bypass the recuperator, reducing pressure loss and maximizing power output.
Solution Approach 2:
The system changes the flow path parameter based on operating conditions. By varying the closure position between fully closed (normal operation) and fully open (high power demand), the system optimizes the balance between heat exchange efficiency and pressure loss, adapting to different power demand scenarios.
2Use of energy by moving object
If the closure remains closed to maintain heat exchange, then fuel efficiency is maintained, but power output is limited during high power demand
Solution Approach 1:
The closure dynamically adapts its position based on power demand conditions. During high power demand situations such as when one engine becomes inoperative, the closure automatically opens to allow compressed air to bypass the recuperator, thereby maximizing power output when it is most needed, while maintaining fuel efficiency during normal operation.
3Device complexity
If a passive closure is used to bypass the recuperator, then device complexity is reduced, but control precision over bypass timing is limited
Solution Approach 1:
The passive closure utilizes the natural pressure differential across the recuperator to automatically open or close the bypass path. When the pressure drop exceeds a predetermined threshold, the closure opens without requiring external actuators or complex control systems, achieving both simplicity and adequate control precision for the intended application.
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 solution ensures efficient power generation by bypassing the recuperator during high power demands, maintaining engine performance even in critical situations like engine failure, while still utilizing the recuperator for efficiency under normal conditions.
Implementation Method 1
a recuperator having a heat absorption conduit fluidly connecting the compressor to the combustor and a exhaust conduit fluidly connecting the turbine to ambient air surrounding the aircraft engine, the heat absorption conduit in heat exchange relationship with the exhaust conduit
Data Source
AI summary
An aircraft engine, has: a compressor, a combustor downstream of the compressor, and a turbine; a recuperator having a heat absorption conduit fluidly connecting the compressor to the combustor and a exhaust conduit fluidly connecting the turbine to ambient air surrounding the aircraft engine, the heat absorption conduit in heat exchange relationship with the exhaust conduit; a compressor conduit fluidly connecting the compressor to the heat absorption conduit of the recuperator, the compressor conduit defining a bypass outlet upstream of the recuperator relative to the flow of the compressed air; and a closure at the bypass outlet, the closure having: a closed position in which the closure closes the bypass outlet; and an opened position in which the closure opens the bypass outlet, wherein the closure is structured to move from the closed position to the opened position upon a pressure drop through the recuperator exceeding a pressure drop threshold.