Intermittent Surface Actuation for Active Drag Control
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Solution Overview
Problem
Existing technologies fail to effectively control surface drag across various fluid flows, leading to reduced efficiency and increased energy consumption in transportation systems and fluid pipelines.
Innovation Solution
A system comprising a surface with actuatable and non-actuatable zones, equipped with sensors and processing circuitry, uses actuators like dielectric-barrier discharge devices or fluid jets to adjust flow properties based on real-time fluid parameters, optimizing surface topology to minimize or maximize drag as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous actuation is used to control surface drag, then drag control effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by using intermittent actuation of plasma actuators or fluidic oscillators at specific frequencies (e.g., 100-1000 Hz) to control surface drag. This periodic actuation disrupts turbulent boundary layers and delays flow separation without requiring continuous energy input, thereby reducing energy consumption while maintaining drag control effectiveness.
Solution Approach 2:
The system dynamically adjusts actuation parameters including frequency, amplitude, and duty cycle based on real-time flow conditions detected by sensors. This dynamic adaptation allows the system to optimize drag control effectiveness while minimizing energy consumption by activating actuators only when and where needed, rather than continuous operation.
2Measurement precision
If more actuators are deployed to improve drag control, then control precision is improved, but device complexity increases
Solution Approach 1:
The surface is divided into discrete actuation zones with individual plasma actuators or fluidic oscillators positioned at specific locations (e.g., leading edge, mid-chord, trailing edge). This segmentation allows independent control of different flow regions, improving overall control precision while keeping each actuator unit simple and modular for easier integration.
Solution Approach 2:
A control system with processing circuitry acts as an intermediary between sensors and actuators, coordinating their operation to achieve precise drag control. The control system processes sensor data, determines optimal actuation strategies, and manages actuator activation sequences, thereby achieving high control precision without requiring complex mechanical linkages between multiple actuators.
3Reliability
If actuation zones are spaced closer together, then flow control effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The surface is segmented into discrete actuation zones spaced at optimized intervals (e.g., every 10-50 cm along the chord) rather than continuous coverage. This segmentation maintains flow control effectiveness by targeting critical flow separation regions while significantly reducing the number of actuators required, thereby simplifying manufacturing and installation processes.
Solution Approach 2:
Each actuator unit is designed as a universal module that can be deployed at multiple locations along the surface. These multi-functional actuator modules can operate independently or in coordination, providing effective flow control at spaced intervals without requiring custom positioning or complex integration at each site, thus easing manufacturing and assembly.
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 allows for active control of surface drag, enhancing efficiency, reducing energy consumption, and improving steering and braking capabilities across different fluid flow regimes, from air transportation to wind turbines and pipelines.
Implementation Method 1
the actuator includes at least one of a dielectric-barrier discharge (DBD) device
Implementation Method 2
the actuator includes at least one of a dielectric-barrier discharge (DBD) device, a motion of the surface, or one or more fluid jets
Data Source
AI summary
A system includes a surface, an actuator, and processing circuitry. The surface includes one or more non-actuating zones and one or more actuatable zones. The actuator is configured to a flow property of a fluid that flows over the one or more actuatable zones of the surface. The processing circuitry is configured to obtain a value of a parameter of the fluid that flows over the surface, and operate the actuator to adjust the flow property of the fluid that flows over the one or more actuatable zones based on the value of the parameter of the fluid.