Plasma Actuation Surface for Tip Vortex Mitigation
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Solution Overview
Problem
Tip vortices and wakes generated by blades in aircraft engines and turbines cause significant aerodynamic losses, noise, and structural issues due to interactions with downstream components, and traditional wake mitigation methods require high-power sources and complex mechanical systems.
Innovation Solution
Integration of a plasma actuation surface on airfoils and blades that provides high-frequency plasma actuation to mitigate vortex and shear flows, inducing instability and promoting rapid mixing of tip-vortices and wakes, thereby reducing their strength and interaction events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional wake mitigation methods (blowing high-momentum fluid at trailing edge) are used, then wake velocity deficit is reduced, but system power requirements and complexity increase due to need for high-pressure fluid sources and complex plumbing
Solution Approach 1:
The patent replaces traditional mechanical wake mitigation systems (blowing devices, fluid injection systems) with a plasma-based actuation system. The plasma actuator uses electrohydrodynamic forces to generate body forces in the boundary layer, eliminating the need for complex mechanical plumbing and high-pressure fluid sources while achieving wake control.
Solution Approach 2:
The plasma actuator serves as an intermediary between electrical power and fluid flow control. It converts electrical energy into body forces within the boundary layer through electrohydrodynamic effects, providing a bridge that avoids direct mechanical intervention while achieving wake mitigation.
2Object-generated harmful factors
If plasma actuation is used to mitigate tip vortices and wakes, then aerodynamic losses and noise are reduced, but energy consumption increases due to plasma power requirements
Solution Approach 1:
The plasma actuator operates with periodic pulsing rather than continuous operation. By applying plasma bursts at optimal frequencies that match the vortex shedding or wake development timescales, the system achieves effective mitigation with reduced average power consumption compared to continuous operation.
Solution Approach 2:
The system optimizes plasma actuation parameters (voltage amplitude, frequency, pulse width, duty cycle) to achieve maximum wake control efficiency at minimum power consumption. By tuning these parameters to match the characteristic timescales of the flow structures being controlled, the system minimizes energy requirements while maintaining effectiveness.
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 plasma actuation surface effectively decreases noise, aerodynamic losses, and structural excitation by destabilizing and dissipating tip-vortices and wakes, offering a low-power, cost-effective solution for wake and tip-vortex mitigation.
Implementation Method 1
plasma actuation surface is configured to provide high-frequency plasma actuation along the plasma actuation surface such that gas in proximity to the plasma actuation surface mitigates vortex flow or shear flow
Data Source
AI summary
An airfoil includes a plasma actuation surface integrated onto the airfoil surface. On the airfoil, the plasma actuation surface is configured to provide high-frequency plasma actuation along the plasma actuation surface such that excitation of the vortex flow or shear flow mitigates the vortex flow or the shear flow associated with the airfoil.