Nozzle With Varying Outlet Angles For Uniform Droplet Coverage
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Solution Overview
Problem
Conventional nozzles for spraying liquids have limitations in covering a larger area with droplet sprays, as they often produce overlapping sprays with inconsistent droplet size distribution, particularly in gas cooling applications where efficient coverage and reduced evaporation distances are critical.
Innovation Solution
A nozzle design with varying outlet angles for outlet openings arranged in concentric circular patterns, allowing for a larger number of outlet openings with conical sprays that overlap minimally, ensuring uniform droplet size and distribution, and incorporating a dual-substance nozzle with an internal mixing chamber and conical distribution wall to enhance droplet breakup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If all outlet openings have constant outlet angle, then the nozzle structure is simple and easy to manufacture, but the coverage area of droplet sprays is limited and sprays overlap significantly
Solution Approach 1:
The patent applies local quality by assigning different outlet angles to different groups of outlet openings based on their radial position. Outlet openings at different radii from the nozzle center have different outlet angles optimized for their specific locations, allowing each local region to contribute optimally to overall coverage without excessive overlap.
Solution Approach 2:
The patent segments the outlet openings into multiple groups based on their radial arrangement, with each group having a distinct outlet angle. This segmentation allows the droplet sprays from different groups to be directed toward different target zones, expanding the overall coverage area while reducing overlap between adjacent sprays.
2Area of stationary object
If the number of outlet openings is increased, then the coverage area is improved, but the droplet size distribution becomes more fluctuating and harder to control
Solution Approach 1:
By assigning different outlet angles to outlet openings at different radial positions, the patent ensures that each local group of openings produces droplet sprays with appropriate characteristics for their location. This local optimization maintains droplet size distribution uniformity even as the total number of openings increases.
Solution Approach 2:
The patent changes the outlet angle parameter across different groups of outlet openings based on their radial position. This parameter variation allows the system to accommodate a larger number of openings while maintaining controlled droplet characteristics, as each group's outlet angle is optimized for its specific radial location.
3Area of stationary object
If outlet openings are arranged to maximize coverage, then the spray distribution is improved, but the evaporation distance increases
Solution Approach 1:
The patent optimizes the outlet angles for different radial positions to balance coverage and evaporation distance. Outlet openings at smaller radii have angles that produce shorter evaporation distances, while those at larger radii have angles optimized for coverage, achieving a local optimization that prevents excessive evaporation distance increase.
Solution Approach 2:
By segmenting outlet openings into radial groups with different outlet angles, the patent ensures that inner openings contribute to shorter evaporation distances while outer openings extend coverage. This segmentation allows the system to achieve both compact evaporation characteristics and extended coverage simultaneously.
Data Source
AI summary
A nozzle for spraying liquids, in particular a dual-substance nozzle, having a nozzle housing and a plurality of outlet openings in the nozzle housing, wherein each outlet opening is arranged at the end of an outlet passage through the wall of the nozzle housing, and wherein the plurality of outlet openings is arranged in a circle on the nozzle housing. An outlet angle which the respective central axis of the outlet passage associated with the outlet opening encloses with a central longitudinal axis of the nozzle housing differs between at least one first and at least one second outlet opening.