Aircraft Engine Inlet Geometry for Boundary Layer Displacement
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Solution Overview
Problem
Existing aircraft designs struggle to efficiently deflect the boundary layer fluid away from the inlet opening of jet engines, resulting in lower energy air flow being ingested, which affects the performance of the jet engine.
Innovation Solution
The aircraft structure incorporates a compression surface, transition shoulder, and a flow guide surface as local elevations to deflect the boundary layer fluid away from the inlet opening, improving the energy of the air flow entering the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If elevations or bumps are arranged on the outer surface to deflect the boundary layer away from the inlet opening, then the energy of the air flow entering the inlet opening is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple surface features (elevation, bump, and flow guide surface) into a single integrated structure on the aircraft outer skin. This unified design achieves boundary layer deflection and flow guidance functions simultaneously, improving air flow energy while avoiding the complexity of separate components
Solution Approach 2:
The flow guide surface is positioned specifically at the transition region between the elevation and the inlet opening, where it is most needed to guide the deflected boundary layer fluid away from the inlet. This localized placement optimizes the energy improvement while minimizing additional structural complexity
2Power
If a larger inlet opening is used to receive high energy air flow, then the power of the jet engine is improved, but the area of the aircraft structure increases
Solution Approach 1:
The elevation and flow guide surface are positioned upstream of the inlet opening to pre-deflect the boundary layer away from the inlet area before the air flow reaches it. This preliminary action ensures that high energy air is delivered to the inlet without requiring an oversized opening, thus maintaining engine power while controlling aircraft structure area
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 the energy of the air flow entering the jet engine, allowing for improved performance and potentially reducing the size of the inlet opening.
Implementation Method 1
the boundary layer of the flow, which is generated on the outer skin of the aircraft
Implementation Method 2
the compression surface (102) and the transition shoulder (104), which are arranged and designed to deflect a boundary layer of an air flow from the inlet opening
Implementation Method 3
The air inlet furthermore has a flow guide surface, wherein the flow guide surface is arranged as a local elevation in a region of the transition shoulder and extends into the inlet opening
Data Source
Figure 1~2
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Figure 5~6
AI summary
An aircraft structure (10) having a fuselage (20), an engine (70) and an air inlet (100) for receiving air for the engine is specified. The air inlet has a cowl which surrounds an inlet opening. The air inlet furthermore has a compression surface (102) and a transition shoulder (104). The air inlet (100) additionally has a flow guide surface (110), which is arranged as a local elevation in a region of the transition shoulder (104) and extends into the inlet opening. This flow guide surface designed as a local elevation contributes to improving the displacement of the boundary layer of a fluid flowing along the aircraft structure at the air inlet.