Fluidic Interaction Chamber Modifiers for Cold Oscillating Sprays
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Solution Overview
Problem
Existing fluidic circuits face challenges in maintaining consistent, uniform spray patterns at a wide range of operating parameters, particularly at low temperatures and low pressures, which can impact their performance in outdoor applications such as automotive and sensor cleaning.
Innovation Solution
A fluidic geometry with a cold step and interaction region modifiers, including symmetrical bean or pill-shaped bumps, is introduced within the interaction chamber to enhance fluidic oscillation and maintain spray characteristics across varying temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluidic circuits are used, then the spray pattern may be uniform at room temperature, but the spray consistency deteriorates at low temperatures and low pressures
Solution Approach 1:
The patent introduces interaction region modifiers (protrusions or recesses) at specific locations within the interaction chamber to locally alter fluid flow characteristics. These localized modifications create enhanced fluidic oscillation and mixing in critical regions, ensuring reliable spray patterns at low temperatures without requiring changes to the entire circuit geometry.
Solution Approach 2:
The patent modifies the interaction chamber geometry by adding cold steps and interaction region modifiers, which change the physical parameters of the fluid flow path. These geometric parameter changes alter the fluid dynamics to maintain oscillation and spray quality across a wider temperature range, particularly improving performance at low temperatures and low pressures.
2Ease of manufacture
If the fluidic circuit geometry is simplified for manufacturing, then the manufacturing cost decreases, but the spray oscillation reliability at low temperatures deteriorates
Solution Approach 1:
Rather than redesigning the entire fluidic circuit geometry, the patent applies localized modifiers (protrusions or recesses) within the interaction chamber. These localized features can be integrated into existing manufacturing processes while providing the necessary flow control to maintain spray reliability at low temperatures.
Solution Approach 2:
The patent introduces vertical dimensionality to the interaction chamber by adding cold steps (elevated regions) and interaction region modifiers. This three-dimensional modification of the otherwise planar circuit geometry creates additional flow control without significantly complicating the overall manufacturing process.
3Reliability
If interaction region modifiers are added to enhance low temperature performance, then the spray reliability at low temperatures improves, but the device complexity increases
Solution Approach 1:
The patent adds complexity only where needed - specifically within the interaction chamber region where fluid mixing and oscillation occur. The interaction region modifiers are localized features that do not propagate complexity throughout the entire fluidic circuit, maintaining simplicity in inlet and outlet regions while providing enhanced performance in the critical interaction zone.
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 proposed geometry ensures reliable, oscillating sprays at low temperatures and low pressures, making it suitable for sensor-cleaning and automotive applications.
Implementation Method 1
a pair of opposing power nozzles, each including a cold step and directed to define a jet along an upstream angle into the interaction chamber
Implementation Method 2
The combination of a cold step and interaction region modifiers disposed within the interaction chamber help kickstart oscillation and open the fan in a variety of different fluidic geometries at low temperatures and/or pressures.
Data Source
AI summary
Modified features can be implemented in various fluidic geometries so as to produce uniform oscillating sprays and improve the cold temperature and low pressure performance, especially with respect to ethanol. The features are bumps formed in or on the interaction chamber's floor, with the chamber itself has a greater depth than the power nozzles owing to a step that is the same height or slightly larger than the bumps. The bumps can present as symmetrical mirror images in the interaction chamber.