Ultrasonic Burner Nozzle Recess for Fine High-Flow Atomization
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Solution Overview
Problem
Existing burner nozzles face challenges in achieving fine atomization of flammable fluids at high flow rates due to reduced turbulence and lower ultrasonic vibration interaction, resulting in larger droplets and incomplete combustion.
Innovation Solution
The nozzle design incorporates a depression or recess in the inflow surface to redirect the fluid flow axially towards the Hartmann generator, ensuring it encounters the highest ultrasonic vibration region, enhancing turbulence and atomization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flow rate of flammable fluid is increased, then the throughput of the nozzle is improved, but the atomization quality deteriorates due to reduced turbulence and lower ultrasonic vibration interaction
Solution Approach 1:
The patent introduces a radial component to the fluid flow by deflecting it against the inlet surface, adding a dimensional change to the primarily axial flow. This radial deflection increases the interaction path and contact time with the ultrasonic atomizing medium, enabling effective atomization even at high flow rates where direct axial interaction would be insufficient.
Solution Approach 2:
The inlet surface is positioned upstream relative to the Hartmann generator, creating a preliminary interaction zone where the flammable fluid is deflected and pre-conditioned before encountering the full ultrasonic vibration. This preliminary action prepares the fluid for more effective atomization by the Hartmann generator.
2Productivity
If the flow velocity of flammable fluid away from the inlet surface is increased, then the throughput is improved, but the relative velocity between fluid and atomizing medium decreases, reducing turbulence
Solution Approach 1:
The inlet surface is designed with a curved, radially extending geometry that deflects the axial fluid flow into a radial direction. This curvature transforms the flow path, creating increased interaction time and turbulence as the fluid follows the curved surface, thereby maintaining effective atomization despite high throughput velocities.
3Productivity
If the flow is concentrated along the inlet surface positioned further towards the nozzle tip, then the throughput is improved, but the fluid encounters ultrasonic vibration in a spaced region where vibration is lower
Solution Approach 1:
The patent utilizes radial deflection of the fluid flow against the inlet surface, changing the flow from purely axial to having significant radial components. This dimensional change redirects the high-velocity flow back toward the Hartmann generator region, ensuring interaction occurs in the high-ultrasonic-vibration zone rather than in spaced regions where vibration is weaker.
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 nozzle achieves high throughput with fine atomization even at high flow rates, reducing the formation of undesirable larger droplets and improving combustion efficiency.
Implementation Method 1
This generator sets an atomizing medium into ultrasonic vibrations
Implementation Method 2
The depression formed in the inlet surface causes the flow of the fluid to be atomized, which flows from the first outlet opening into the depression, to be deflected not only horizontally but also axially
Implementation Method 3
The turbulence of the atomizing medium breaks the combustible fluid into fine droplets
Implementation Method 4
The inertia of the droplets prevents them from oscillating at such high frequencies, so that the droplets break up into even smaller droplets
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A nozzle (1) with a longitudinal axis (L) and a nozzle end (3) has at least one first channel (5) extending towards the nozzle end (3) for a fluid (F) to be atomized, which opens into a first outlet opening (8), and at least one second channel (11) extending towards the nozzle end (3) for an atomizing medium (2), which opens into at least one second outlet opening (12). A Hartmann generator (13) is arranged opposite the second outlet opening (12). Opposite the first outlet opening (8), which is directed substantially axially, is a flow surface (16) extending substantially horizontally and pointing away from the nozzle end (3), which is arranged closer to the nozzle end (3) than the Hartmann generator (13). The flow surface (16) has a recess (22) in a region opposite the first outlet opening (8).