Fluidic Oscillator Synchronization for Boundary Layer Separation Control
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Solution Overview
Problem
Existing fluid flow control systems, particularly Active Flow Control (AFC) systems, face challenges in synchronizing fluidic actuators effectively to inhibit or delay fluid flow separation over curved surfaces, leading to increased aerodynamic drag and reduced lift, which is crucial for vehicles and aircraft.
Innovation Solution
A fluidic system comprising a plurality of fluidic oscillatory actuators connected by synchronization conduits to achieve synchronized oscillations, with at least one actuator being a suction and oscillatory blowing (SaOB) actuator, allowing for controlled phase lag and opposite oscillations, thereby reducing drag and enhancing lift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fluidic actuators are used to control flow separation, then the effectiveness of flow control is improved, but the synchronization between actuators becomes more difficult to achieve
Solution Approach 1:
The patent replaces mechanical synchronization mechanisms with a fluidic synchronization system using synchronization conduits that use pressure equalization to coordinate the oscillation of multiple actuators. This eliminates complex mechanical linkages while achieving reliable synchronization across multiple actuators, resolving the contradiction between flow control effectiveness and synchronization complexity.
Solution Approach 2:
The synchronization conduits act as intermediary elements that mediate between multiple actuators, using fluid pressure as a signaling mechanism to coordinate their operation. This intermediary fluidic communication system enables synchronized operation without direct mechanical coupling, reducing overall system complexity while maintaining reliability.
2Device complexity
If conventional synchronization methods are used, then the system structure is simple, but the synchronization precision and phase control are insufficient
Solution Approach 1:
The patent enables precise phase control by adjusting parameters such as conduit dimensions, fluid flow rates, and pressure differential settings. These parameter changes allow fine-tuning of synchronization precision and phase relationships between actuators while maintaining a relatively simple overall system structure, resolving the contradiction between simplicity and precision.
3Loss of energy
If fluidic oscillatory actuators are synchronized to reduce drag, then aerodynamic efficiency is improved, but the system requires precise phase control which increases complexity
Solution Approach 1:
The synchronization conduits create a self-regulating system where the fluid pressure naturally equalizes between actuators, automatically establishing and maintaining synchronized oscillation phases. This self-service mechanism reduces drag effectively without requiring external complex phase control systems, resolving the contradiction between energy loss reduction and control 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
The system effectively synchronizes fluidic oscillators to reduce aerodynamic drag by up to 20% and enhance lift, achieving significant fuel savings and improved aerodynamic efficiency for vehicles and aircraft by delaying boundary layer separation.
Implementation Method 1
at least one synchronization conduit connecting two or more of the actuators such as to effect synchronization between oscillations in the two or more connected actuators
Implementation Method 2
AFC systems are typically utilized to inhibit or delay separation of the fluid flow over the surface
Implementation Method 3
Flow separation can occur when a compressible or incompressible fluid flows over a surface, in particular a convex curved surface
Data Source
AI summary
An active separation control system, comprising a fluidic oscillatory actuator having an ejector member, an oscillator member, and a joining channel between said oscillator member and said ejector member, all mounted on at least one flexible member, said fluidic oscillatory actuator being mountable on a rotatable door of a vehicle such that said flexible member assumes a different shape when said door is closed than when said door is open, wherein said joining channel is also flexible to assume a shape of said flexible member.