Slat Airflow Control Part for Noise Reduction
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Solution Overview
Problem
Existing high-lift devices on aircraft, such as slats and flaps, generate significant aerodynamic noise during takeoff and landing, which is a major environmental concern, but noise reduction technologies often increase airframe weight and require complex mechanisms for inflation and air supply systems.
Innovation Solution
A high-lift device with a slat main body that extends and retracts into a main wing, featuring a concave part and an airflow control part, including an inclined plate and seal part, which accommodates the leading edge of the main wing and reduces turbulence and noise by deflecting airflow, thereby maintaining aerodynamic characteristics without increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a balloon is disposed on a concave part of a slat to suppress aerodynamic noise, then noise reduction is achieved, but the device complexity and airframe weight increase due to required inflation mechanisms and high-pressure air supply systems
Solution Approach 1:
The invention extracts and eliminates the complex balloon inflation mechanism and high-pressure air supply system from the noise reduction solution. Instead, it uses a simple fixed baffle structure that passively suppresses turbulence and aerodynamic noise without requiring any active mechanisms or additional components
Solution Approach 2:
The baffle structure serves itself by passively utilizing the natural airflow to suppress turbulence. The baffle is positioned to automatically redirect flow patterns without requiring external control systems, power sources, or maintenance, thereby eliminating the need for complex mechanisms while maintaining noise reduction effectiveness
2Object-affected harmful factors
If a balloon is disposed on a concave part of a slat to suppress aerodynamic noise, then noise reduction is achieved, but airframe weight increases due to additional mechanisms and components
Solution Approach 1:
The invention removes the heavy balloon inflation mechanisms, high-pressure air supply systems, compressors, and associated piping from the design. The replacement baffle structure is significantly lighter and requires no additional components, thereby reducing overall airframe weight while maintaining noise suppression capability
Solution Approach 2:
The baffle structure is a simple, lightweight component that can be easily manufactured and installed without requiring durable, heavy-duty mechanisms. It provides effective noise reduction through its geometric design rather than through complex mechanical systems, achieving weight savings while maintaining functionality
3Stability of the object's composition
If the leading edge of the main wing is designed without considering interference with noise reduction mechanisms, then aerodynamic characteristics are improved, but the concave part cannot accommodate the leading edge when slat is retracted
Solution Approach 1:
The invention removes the noise reduction mechanisms (balloon, inflation system, air supply components) from the concave part area, allowing the leading edge of the main wing to be designed purely for aerodynamic optimization without needing to accommodate any noise suppression devices. The baffle structure is integrated into the slat body rather than occupying space in the concave part
Solution Approach 2:
Instead of placing noise reduction mechanisms in the concave part and designing around them, the invention inverts the approach by integrating the baffle into the slat body structure itself. This allows the concave part to be fully utilized for accommodating the leading edge while aerodynamic characteristics remain optimized
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 effectively suppresses aerodynamic noise while preventing weight increase by using a simpler structure that deflects airflow and reduces turbulence, improving aerodynamic performance without additional components or complex mechanisms.
Implementation Method 1
suppresses the turbulence colliding against the area in the concave part facing the upper surface of the main wing
Data Source
AI summary
A high-lift device suppresses the occurrence of aerodynamic noise while minimizing an increase in airframe weight. The device includes a slat main body disposed to be able to extend from and retract into a main wing, and a concave part formed on the slat main body at a location facing the main wing and able to accommodate at least a part of a leading edge of the main wing. The device also includes an airflow control part disposed at an area in the concave part facing an upper surface of the main wing, that is accommodated between the main wing and the concave part when the slat main body is retracted into the main wing, and that suppresses turbulence colliding against the area in the concave part facing the upper surface of the main wing when the slat main body is extended from the main wing.