Propulsor Flow Field Velocity Reduction via Aerodynamic Structure
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Solution Overview
Problem
Current aircraft propulsion systems, such as propellers and turbofan engines, face inefficiencies at high speeds due to increased aerodynamic drag, noise, weight, and complexity, leading to a need for more efficient propulsion solutions to reduce fuel costs and environmental impact.
Innovation Solution
The system enhances the aerodynamic structure to create a reduced velocity flow field region, allowing a propeller to operate more efficiently at higher speeds by shaping the wing, fuselage, and control surfaces to position the propulsor within this region, thereby increasing propulsive efficiency and potentially replacing turbofans with propellers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If propellers are used at high flight speeds (above Mach 0.7), then propulsive efficiency deteriorates due to increased aerodynamic drag, but the patent introduces an aerodynamic structure enhancement to create a reduced velocity flow field region that allows propellers to operate efficiently at higher speeds
Solution Approach 1:
The patent introduces an aerodynamic structure enhancement (such as a duct or shroud) as an intermediary element between the propeller and the external high-speed flow field. This intermediary structure creates a reduced velocity flow field region that mediates the interaction between the high-speed aircraft and the propeller, allowing the propeller to operate in lower speed conditions while the aircraft travels at higher speeds.
Solution Approach 2:
The aerodynamic structure enhancement modifies the flow field parameters (velocity, pressure distribution) in the region surrounding the propeller. By changing the local flow velocity from the high external flow speed to a reduced velocity region, the propeller can maintain efficient operation at higher aircraft speeds without experiencing the detrimental effects of high-speed propeller flow.
2Speed
If turbofan engines are used to operate at high flight speeds, then speed capability is improved, but propulsive efficiency deteriorates because turbofans convert only about 70% of shaft horsepower into thrust and have greater parasitic drag
Solution Approach 1:
The aerodynamic structure enhancement serves as a mediator that enables propellers to operate in a protected flow field environment, allowing them to achieve turbofan-level speed capability while maintaining superior propulsive efficiency. This intermediary structure resolves the trade-off between speed capability and energy conversion efficiency.
Solution Approach 2:
By modifying the local flow field parameters through the aerodynamic enhancement, the system enables propellers to operate at higher effective speeds without the energy losses associated with turbofan engines, thereby achieving both high speed capability and high propulsive efficiency.
3Speed
If propellers operate at high speeds without flow field modification, then flight speed is improved, but aerodynamic drag increases significantly reducing efficiency
Solution Approach 1:
The aerodynamic structure enhancement acts as a protective intermediary that shields the propeller from the full brunt of high-speed external flow, creating a reduced velocity region that minimizes aerodynamic drag on the propeller blades while allowing the aircraft to maintain high flight speed.
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 approach enhances propulsive efficiency, reduces fuel costs, and minimizes environmental impact by allowing propellers to operate effectively at higher speeds, potentially replacing turbofans with propellers, resulting in increased efficiency and reduced drag.
Implementation Method 1
An aerodynamic structure enhancement is suitably shaped to reduce flow field velocity in a flow field region near the aerodynamic structure enhancement
Data Source
AI summary
A system and methods for reducing flow field velocity into a propeller is disclosed. An aerodynamic structure is enhanced to provide a reduced velocity flow field region, and a propeller is positioned in the reduced velocity flow field region.