Fluidic Oscillator Plunger Adjustment for Independent Jet Control
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Solution Overview
Problem
Existing fluidic oscillator systems have fixed geometries, limiting the adjustability of fluid flow parameters such as period, angular displacement, and pressure of sweeping fluid jets, which can adversely affect other operational needs.
Innovation Solution
Incorporating a movable plunger within the oscillator's cavity to vary the aspect ratio, allowing for adjustable fluid flow properties by moving the plunger along the cavity's depth, thus controlling the fluid jet's characteristics independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed geometry oscillator is used, then the device complexity is reduced, but the adaptability of fluid flow parameters is limited
Solution Approach 1:
The patent applies the dynamics principle by introducing a movable plunger that can adjust the cavity depth, transforming the fixed geometry oscillator into a dynamic system. The plunger allows real-time modification of the oscillatory chamber volume and aspect ratio, enabling continuous adjustment of fluid flow parameters including period, angular displacement, and jet pressure without requiring multiple fixed-geometry devices.
Solution Approach 2:
The patent implements parameter changes by varying the cavity depth through plunger movement, which directly changes the aspect ratio and volume of the oscillatory chamber. This geometric parameter modification enables independent control of momentum coefficient and jet spread angle, providing versatile adjustment of fluid flow characteristics while maintaining a single device structure.
2Volume of moving object
If the cavity depth is increased, then the oscillatory chamber volume is increased, but the aspect ratio changes affecting fluid jet characteristics
Solution Approach 1:
The movable plunger enables dynamic adjustment of cavity depth, allowing the system to transition between different volume and aspect ratio states. This dynamic capability resolves the contradiction by making both volume and aspect ratio adjustable parameters rather than fixed coupled properties, enabling independent optimization of fluid jet characteristics.
Solution Approach 2:
By changing the cavity depth parameter through plunger movement, the system simultaneously modifies both the volume and aspect ratio of the oscillatory chamber. This parameter change approach allows controlled variation of geometric properties to achieve desired fluid flow characteristics while understanding the interrelationship between volume and shape parameters.
3Stress or pressure
If fluid flow parameters are adjusted, then the momentum coefficient is changed, but the jet spread angle is adversely affected
Solution Approach 1:
The patent segments the control functions by separating the adjustment of momentum coefficient and jet spread angle into independent controllable parameters. Through the plunger mechanism, users can first set the desired momentum coefficient by adjusting cavity depth, then independently fine-tune the jet spread angle by additional plunger positioning, achieving decoupled control of these previously coupled parameters.
Solution Approach 2:
The dynamic plunger mechanism enables sequential and independent adjustment of fluid flow parameters. The system can dynamically transition between different operating points, first optimizing momentum coefficient through cavity depth adjustment, then independently adjusting jet spread angle through further plunger positioning, resolving the coupling constraint between these parameters.
Data Source
AI summary
Adjustable fluidic oscillators are disclosed. A disclosed example oscillator includes a base having a cavity with a cross-sectional profile defining an oscillatory chamber between an inlet and an outlet of the oscillator, and a plunger to be received by the cavity and movable along a depth of the cavity to vary an aspect ratio of the oscillator.