Bimorph Actuator Vortex Generator for Flow Separation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluid flow adjacent to a surface often separates, leading to increased drag and reduced aerodynamic performance, as existing fixed blades are ineffective in managing boundary layer separation.
Innovation Solution
A bimorph actuator system with a blade that can rotate from a retracted to a deployed position to extend into the fluid flow, generating vortices and preventing separation by drawing fluid back into the boundary layer, thereby improving aerodynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed blades are used to generate vortexes, then flow separation is reduced, but the device cannot adapt to varying flow conditions and generates excessive drag
Solution Approach 1:
The patent applies the dynamics principle by transitioning from fixed blades to movable blades that can rotate between a deployed position (extending into the boundary layer to generate vortexes) and a retracted position (flush with the surface). This dynamic adjustment allows the vortex generator to adapt to varying flow conditions and minimize drag when vortex generation is not required, while maintaining reliable flow separation control when activated.
2Reliability
If blades extend into the boundary layer to generate vortexes, then flow separation is prevented, but drag increases when blades are deployed
Solution Approach 1:
The movable blade mechanism allows the system to dynamically adjust between drag-reducing (retracted) and flow-control (deployed) states, minimizing harmful drag effects while maintaining flow separation prevention capability when needed.
Solution Approach 2:
The bimorph actuator enables periodic deployment and retraction of the blade, creating oscillatory vortex generation that can more effectively control flow separation while reducing time-averaged drag compared to continuous blade deployment.
3Reliability
If traditional fixed vortex generators are used, then flow separation is controlled, but energy consumption increases and aerodynamic performance is reduced
Solution Approach 1:
The movable blade system consumes energy only when deployment is required for flow separation control, whereas fixed blades continuously disrupt the flow and increase energy consumption. The bimorph actuator enables on-demand activation, significantly reducing overall energy usage.
Solution Approach 2:
The oscillatory motion generated by the bimorph actuator creates periodic vortex shedding that maintains flow attachment with minimal energy input, leveraging unsteady flow effects to achieve flow control at lower energy costs than steady-state solutions.
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 reduces drag, delays flow separation, and mitigates stall phenomena, enhancing the aerodynamic performance of surfaces such as aircraft wings by generating oscillatory streams of vortices in the fluid boundary layer.
Implementation Method 1
The bimorph actuator includes a first bimorph beam having a first portion fixed relative to the surface. A blade is rotatably coupled to the bimorph actuator, and the bimorph actuator is to rotate the blade to extend a portion of the blade through the surface
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Vortex generators are disclosed herein. An example apparatus includes a housing including a surface. The example apparatus also includes a bimorph actuator (300) disposed in the housing. The bimorph actuator includes a first bimorph (302) beam having a first portion fixed relative to the surface. A blade (200) is rotatably coupled to the bimorph actuator (300), and the bimorph actuator (300) is to rotate the blade (200) to extend a portion of the blade (08) through the surface to generate a vortex in a fluid flowing past the surface.