Two-Phase Plasma Generator Uniform Distribution
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Solution Overview
Problem
Conventional atmospheric pressure plasma generators produce non-uniform plasma distributions due to corona discharges forming at highly curved regions, leading to uneven surface treatment during industrial applications.
Innovation Solution
A two-phase plasma generator design featuring a first inner electrode with protrusions and a second inner electrode with a smooth surface, where gas is injected and excited in two phases to create plasma, with the second phase resulting in a more uniform distribution across the outer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If corona discharges are applied to generate atmospheric pressure plasma, then plasma generation is achieved, but plasma distribution becomes non-uniform due to higher density at highly curved regions
Solution Approach 1:
The inner electrode is segmented into multiple protrusions distributed across its surface. Each protrusion generates localized corona discharge, and the collective arrangement of multiple segmented elements creates a more uniform overall plasma distribution compared to a single curved electrode surface.
Solution Approach 2:
The electrode surface is designed with protrusions that create localized high-electric-field regions. By strategically positioning these protrusions, the plasma generation is concentrated at specific local points that collectively cover the entire treatment area, achieving uniform distribution through controlled local plasma sources.
2Quantity of substance
If protrusions are added to the inner electrode to generate corona discharge, then plasma is formed, but the plasma density becomes concentrated at protrusion regions rather than evenly distributed
Solution Approach 1:
The inner electrode features asymmetric protrusion geometry with specific height, spacing, and distribution patterns. This asymmetric design creates controlled electric field variations that promote uniform plasma initiation across the gap, transforming the naturally concentrated corona discharge into a spatially uniform plasma distribution.
Solution Approach 2:
The electrode design transitions from a two-dimensional flat surface to a three-dimensional structure with protrusions extending into the gas gap. This dimensional change creates multiple plasma initiation points distributed in space, allowing plasma to form uniformly across the treatment area rather than concentrated at single points.
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 two-phase plasma generator achieves a more consistent and even plasma distribution, addressing the issue of non-uniformity in conventional systems and enhancing the effectiveness of surface treatment processes.
Implementation Method 1
A voltage signal may be applied across the outer electrode and the two inner electrodes to ionize the gas and generate plasma
Implementation Method 2
The gas further flows from the first gaps to the second gap
Implementation Method 3
Conventional systems for generating atmospheric pressure plasma apply AC or DC voltage signals across a serrated electrode to produce corona discharges. The corona discharges break down a fluid (air or gas) and form plasma
Data Source
AI summary
A plasma generator includes an outer electrode that encloses a first inner electrode and a second inner electrode. The first inner electrode includes a plurality of protrusions that extend towards the outer electrode. A voltage signal can be applied across the outer electrode and the first inner electrode to excite gas injected into gaps between the protrusions and the outer electrode. Plasma is generated surrounding the protrusions. The second inner electrode is at a downstream location of the excited gas relative to the first inner electrode. The second inner electrode forms a second gap with the outer electrode. A voltage signal can be applied across the second inner electrode and the outer electrode, further exciting the gas to generate second plasma at the second gap. The second plasma is spread evenly across the second inner electrode and the outer electrode.