Removable Airflow Oscillators for Wing Boundary Layer Control
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Solution Overview
Problem
Existing airflow oscillation devices integrated into aircraft airframes are heavy, difficult to maintain, and prone to clogging, which reduces hover performance due to airflow separation and drag issues.
Innovation Solution
A removable passive airflow oscillation device is integrated into a pressurized wing structure, using a self-contained design with 3-D printed high-temperature materials or metal, allowing for quick replacement and maintenance, and utilizing a pressurized plenum to energize airflow and reduce drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large aluminum block with multiple actuators is used, then airflow control capability is improved, but device weight increases and maintenance difficulty increases
Solution Approach 1:
The airflow control system is divided into multiple independent actuator devices that can be separately installed and removed. Each actuator is a standalone component rather than being integrated into a large block, allowing individual replacement without affecting other actuators. This segmentation reduces overall device weight while maintaining airflow control capability through distributed actuation points.
Solution Approach 2:
The actuators are extracted from a monolithic aluminum block structure and made into removable, independent components. This allows the actuators to be taken out for maintenance or replacement without removing the entire airframe structure, significantly reducing maintenance difficulty while preserving the airflow control function.
2Strength
If actuators are built into a solid block, then structural integrity is improved, but ease of repair and cleaning deteriorates
Solution Approach 1:
The actuator assembly is segmented into removable components that can be independently accessed and maintained. Each actuator can be removed from the airframe structure without compromising the overall structural integrity, as the actuators are designed to be mounted on external surfaces rather than being embedded in load-bearing structures.
Solution Approach 2:
The actuators are extracted from the solid block structure and made externally mountable with removable connections. This allows easy access for cleaning and repair operations while maintaining structural integrity through proper mounting design that does not compromise the airframe's load-bearing capacity.
3Reliability
If wing flaps are rotated down to minimize download effects, then hover performance is improved, but airflow separation increases due to rotor downwash
Solution Approach 1:
The actuators generate oscillating airflow through vibration or pulsing flow patterns that energize the boundary layer over the wing flaps. This mechanical vibration of the airflow prevents separation caused by rotor downwash, allowing the flaps to remain in the down position for optimal hover performance without suffering from drag-inducing flow separation.
Solution Approach 2:
The harmful airflow separation is addressed by introducing a fluid dynamic solution (oscillating airflow from actuators) rather than mechanically adjusting the flap position. This substitution allows the flaps to maintain their optimal hover position while the actuator-generated oscillations prevent separation, avoiding the need to compromise flap positioning.
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 enables quick maintenance, reduces aircraft weight, and enhances hover performance by keeping airflow attached, thereby increasing lift capacity and reducing drag.
Implementation Method 1
The device can receive airflow from a compressor source and expel an oscillating airflow. Because each device is self-contained the number of devices and location thereof can vary by application.
Implementation Method 2
AFC actuators can control airflow mixing and energize the boundary layer to control flow separation when implemented on the wing of an aircraft.
Data Source
AI summary
A removable passive airflow oscillation device can be disposed within a pressurized wing structure utilized as a plenum. The passive airflow oscillation device can be a removable insert disposed into exterior vehicle surfaces with pressurization of a sealed chamber to provide the airflow. The device can include a cavity configured to receive the airflow from an ingress opening, direct the airflow therethrough to generate a predetermined oscillating airflow, and expel the oscillatory airflow from the egress opening. The removable passive airflow oscillation devices can provide quick and simple replacement and maintenance of damaged or clogged devices. The aft chamber of the flap seal can be sealed and pressurized to serve as a plenum providing the airflow to the actuators. The device can receive airflow, such as compressor air, and expel an oscillating airflow. Because each device is self-contained the number of devices and location thereof can vary by application.