Adjustable Airfoil Louvers for Lift-Drag Trade-off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current airfoil systems are inefficient as they are designed for either low or high speeds, leading to suboptimal performance in varying flight conditions, and struggle to adapt to different angles of attack, resulting in increased drag and power requirements.
Innovation Solution
An adjustable airfoil system incorporating a louver system that changes conformation based on airflow forces, allowing for adjustable thickness and camber, thereby optimizing lift and drag characteristics across different speed ranges and angles of attack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If airfoil upper surface is made larger to increase lift for slow flight, then lift is improved, but drag increases
Solution Approach 1:
The patent employs movable louvers that can dynamically adjust the airfoil's camber and thickness according to flight conditions. During slow flight, the louvers are positioned to increase camber and thickness for maximum lift. During fast flight, the louvers adjust to reduce camber and thickness to minimize drag, thus resolving the contradiction between lift and drag across different speed regimes
Solution Approach 2:
The invention changes the geometric parameters of the airfoil (camber, thickness, upper surface area) by moving the louvers to different positions. This allows the airfoil to transform from a high-lift configuration at low speeds to a low-drag configuration at high speeds, effectively addressing the trade-off between lift generation and drag reduction
2Object-generated harmful factors
If airfoil is designed for high speed flight with smaller upper surface, then drag is reduced, but power requirements increase and low speed performance deteriorates
Solution Approach 1:
The movable louver system enables the airfoil to dynamically adapt its geometry to flight conditions. At high speeds, the louvers position themselves to create a streamlined, low-drag profile. At low speeds, they adjust to increase camber and surface area for adequate lift, eliminating the need for continuous high power input that would be required with a fixed high-speed airfoil design
Solution Approach 2:
The single airfoil structure with movable louvers performs multiple functions: it can operate efficiently at both high speeds (low drag configuration) and low speeds (high lift configuration). This multi-functionality eliminates the need for separate airfoil designs for different speed regimes and reduces overall power requirements across the flight envelope
3Force
If angle of attack is increased to generate more lift, then lift is improved, but boundary layer separation occurs and drag increases
Solution Approach 1:
Instead of increasing angle of attack to generate more lift, the invention changes the geometric parameters of the airfoil by moving the louvers to increase camber and thickness. This allows the airfoil to generate additional lift through geometric modification rather than angular adjustment, avoiding boundary layer separation and the associated drag penalty
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 adjustable louver system enhances aerodynamic performance by reducing drag and increasing lift at various speeds and angles of attack, improving the aircraft's efficiency during vertical takeoff, landing, and horizontal flight.
Implementation Method 1
The plurality of louvers are configured to change conformation based on a force produced by an airflow
Data Source
AI summary
The present set of embodiments relate to systems, methods, and apparatuses for airfoil systems designed for aircraft or other craft. More specifically, the present disclosure includes various embodiments of airfoils that include fixed or adjustable louvers that allow the airfoil to adapt to various conditions including angle or attack and airspeed. Such airfoil systems increase the dynamic range or airfoils by maximizing lift or minimizing drag depending on the conditional requirements.