Sweeping Plasma Actuator for Aerodynamic Drag Reduction
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Solution Overview
Problem
Current plasma actuators are limited in their effectiveness for reducing aerodynamic drag on vehicles, as they struggle to efficiently control airflow separation and manage drag across various vehicle surfaces.
Innovation Solution
A plasma actuator design featuring a hollow cylindrical configuration with internal and external electrodes, coupled with a piezoelectric motion actuator that moves in a sweeping motion across vehicle surfaces, adjusts frequency and voltage based on vehicle speed and base pressure to optimize airflow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional plasma actuator is used, then the device structure is simple, but the effectiveness in reducing aerodynamic drag is limited
Solution Approach 1:
The plasma actuator is segmented into multiple electrodes (first electrode, second electrode, third electrode) arranged in a specific configuration. This segmentation allows independent control of different plasma regions, improving drag reduction effectiveness by addressing complex flow separation patterns on various vehicle surfaces.
Solution Approach 2:
The actuator incorporates a motion actuator that dynamically adjusts the position and orientation of plasma electrodes based on real-time flow conditions. This dynamic adaptability enables the system to maintain optimal performance across different vehicle speeds and flow regimes, resolving the contradiction between effectiveness and fixed structure complexity.
2Reliability
If the plasma actuator operates at high power, then the airflow control effectiveness is improved, but the energy consumption increases
Solution Approach 1:
The plasma actuator employs periodic pulsed operation instead of continuous high-power operation. By applying plasma discharge in optimized pulses synchronized with flow separation events, the system achieves effective airflow control while significantly reducing average energy consumption compared to continuous operation.
Solution Approach 2:
The system incorporates sensors that detect flow separation conditions and provide feedback to the power controller. This feedback mechanism enables the actuator to operate at high power only when and where flow separation is detected, automatically reducing power consumption in regions or times where full power is not needed, thus resolving the energy effectiveness contradiction.
3Adaptability or versatility
If the plasma actuator is fixed in position, then the device complexity is low, but the adaptability to various vehicle surfaces is reduced
Solution Approach 1:
The plasma actuator system is designed with universal mounting capabilities that allow the same actuator design to be installed on various vehicle surfaces including curved and flat areas. The motion actuator enables a single actuator to serve multiple positions and functions, providing surface adaptability without requiring multiple specialized actuator designs, thus managing complexity while enhancing versatility.
Solution Approach 2:
The motion actuator provides dynamic positioning capability that allows the plasma electrodes to adapt their position according to the specific geometry of different vehicle surfaces. This dynamic adjustment enables effective plasma discharge on curved surfaces, flat panels, and complex geometries using a unified actuator design, resolving the contradiction between adaptability and system complexity.
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 configuration effectively reduces aerodynamic drag by delaying airflow separation and improving fuel efficiency, enhancing the performance of plasma actuators in drag reduction applications.
Implementation Method 1
a motion actuator configured to cause the at least one of the plasma actuator to move in a sweeping motion across the surface... The motion actuator may include a piezoelectric device
Implementation Method 2
a plasma actuator comprising a hollow cylinder with two open bases, a first electrode disposed inside the cylinder, a second electrode disposed outside the cylinder, and a plasma layer inside the cylinder next to the first electrode
Data Source
AI summary
An apparatus configured to reduce drag is provided. The apparatus includes a plasma actuator including a hollow cylinder with two open bases, a first electrode disposed inside the cylinder, a second electrode disposed outside the cylinder, and a plasma layer disposed inside the cylinder next to the first electrode, a surface including the plasma actuator disposed on the surface, and a motion actuator configured to move the plasma actuator in a sweeping motion across a face of the surface.