Fluidic Oscillator Control Ports for Variable Frequency and 3D Jets
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Solution Overview
Problem
Fluidic oscillators are limited by their fixed frequency and sweeping angle, which cannot be adjusted for different applications, and they produce only two-dimensional output jets, restricting their use in scenarios requiring variable frequencies and three-dimensional jets.
Innovation Solution
The design incorporates control ports that introduce or suction fluid streams to vary the frequency and sweeping angle of the fluidic oscillator, allowing for adjustable output and enabling the creation of three-dimensional jets by altering the fluid stream's trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control ports are added to vary frequency and sweeping angle, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent uses control ports that introduce or suction control fluid to vary the frequency and sweeping angle of the oscillating jet. This pneumatic control mechanism allows frequency adjustment up to five times more variation at a given flow rate without mechanical moving parts, resolving the contradiction by using fluid dynamics rather than mechanical adjustment mechanisms.
Solution Approach 2:
The control ports change the operational parameters (frequency and sweeping angle) of the fluidic oscillator by introducing or suctioning control fluid. This allows continuous variation of frequency and sweeping angle independently of flow rate, achieving high adaptability while maintaining a relatively simple structure without mechanical components.
2Speed
If feedback channels are configured to allow fluid flow into oscillation, then oscillation frequency increases, but device complexity increases
Solution Approach 1:
The patent incorporates feedback channels that allow a portion of the oscillating fluid to be fed back into the interaction chamber, creating a feedback loop that enhances the oscillation frequency. The feedback channels are configured with specific geometries and orientations that amplify the oscillatory motion, achieving higher frequency operation through fluid dynamic feedback rather than mechanical means.
Solution Approach 2:
The feedback mechanism is entirely pneumatic, using the fluid itself to provide feedback control. The feedback channels utilize pressure differentials and fluid momentum to create self-sustaining oscillations at higher frequencies, avoiding the need for mechanical feedback components and maintaining structural simplicity.
3Adaptability or versatility
If control fluid is introduced through control ports, then frequency variation increases, but energy consumption increases
Solution Approach 1:
The control ports are designed to utilize the existing flow energy of the main fluid stream to drive the frequency and sweeping angle variations. The control fluid is taken from or returned to the main flow, and the energy required for control is extracted from or deposited into the oscillating flow itself, minimizing additional energy input while achieving wide frequency variation.
Solution Approach 2:
The system recovers energy by using the control fluid that is suctioned from or introduced into the flow. The control fluid undergoes a complete cycle, being drawn from the main flow during one phase of oscillation and returned during another phase, effectively recycling the energy and minimizing net energy consumption while maintaining frequency control capability.
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 design allows for up to five times more frequency variation at a given flow rate without moving parts, reducing maintenance and cost, and enables the production of three-dimensional output jets, expanding the device's application range.
Implementation Method 1
The first attachment wall and second attachment wall of the interaction chamber are shaped to allow fluid from the fluid stream to flow into the first ends of the first feedback channel and second feedback channel, respectively, causing the fluid stream to oscillate between the first attachment wall and second attachment wall of the interaction chamber.
Implementation Method 2
The first feedback channel and second feedback channel are in fluid communication with the interaction chamber. Each of the first feedback channel and second feedback channel have a first end, a second end opposite and spaced apart from the first end, and an intermediate portion disposed between the first end and second end.
Data Source
AI summary
Various implementations include a fluidic oscillator having at least one control port. The at least one control port is for introducing a control fluid into the fluidic oscillator or suctioning the fluid stream from the fluidic oscillator. The introduction of a control fluid into the fluidic oscillator or suction of the fluid stream from the fluidic oscillator alters the frequency and sweeping angle of the oscillating fluid stream as it exits the fluidic oscillator. Various other implementations include a fluidic oscillator having a first control port defined by the first portion of the outlet nozzle and a second control port defined by the second portion of the outlet nozzle. The introduction of a control fluid into the fluidic oscillator or suction of the fluid stream from the fluidic oscillator through the control ports alters the exit angle of the oscillating fluid stream as it exits the fluidic oscillator.