Neutrode Stack Cooling for Plasma Guns
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Solution Overview
Problem
Cascade type plasma guns experience high thermal losses due to heat rejection from the plasma arc, limiting the practical length of the neutrode stack and offsetting the advantages of higher voltages and stable arcs, necessitating an optimized cooling structure to prevent thermal damage.
Innovation Solution
The design involves moving water passages away from the plasma gun bore, allowing copper material to distribute heat and increasing average temperatures, with water cooling channels on the outer peripheral surface of disk-shaped bodies, electrically isolating and clamping these bodies to form a thermally optimized neutrode stack with high water velocities, reducing peak temperatures and thermal losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water cooling channels are placed close to the plasma bore, then peak temperatures are reduced, but thermal losses to cooling water increase
Solution Approach 1:
The cooling channels are moved from a radial position near the plasma bore to an axial position at the outer periphery of the neutrode. This spatial repositioning changes the heat transfer path, allowing the copper material to conduct heat axially to the cooling channels, thereby reducing peak temperatures while minimizing direct thermal coupling and thermal losses to the cooling water.
2Power
If the neutrode stack length is increased, then higher voltages and stable arcs are achieved, but thermal losses increase
Solution Approach 1:
The neutrode stack is divided into multiple disk-shaped bodies that can be coaxially aligned and stacked. Each disk can incorporate the optimized peripheral cooling channel design, allowing the stack to be extended in length while maintaining effective cooling throughout. This segmentation enables longer stacks to achieve higher voltages and stable arcs without proportionally increasing thermal losses.
3Temperature
If water passages are moved away from the plasma bore, then copper material distributes heat reducing peak temperatures, but water cooling cross section must be reduced
Solution Approach 1:
The cooling channels are positioned at the outer periphery of the neutrode where the cross-sectional area is larger. This location provides sufficient cooling capacity while allowing the copper material to distribute heat from the plasma bore region to the cooling channels through axial conduction. The peripheral positioning optimizes both heat distribution and cooling efficiency without requiring complex internal channel geometries.
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
This approach allows for longer neutrode stacks with reduced thermal losses and increased thermal efficiency, maintaining stable gun performance without adverse thermal effects, as demonstrated by a 10% increase in thermal efficiency and minimal decrease in efficiency when doubling the stack length.
Implementation Method 1
allowing the copper material of the neutrode to move the heat reducing peak temperatures
Implementation Method 2
water cooling channels on the outer peripheral surface of disk-shaped bodies, electrically isolating and clamping these bodies to form a thermally optimized neutrode stack with high water velocities
Data Source
Figure 1~2A
Figure 2B~2E
Figure 3~4
AI summary
The design and implementation of a thermally optimized neutrode stack for cascaded plasma guns is provided that reduces the thermal loss to the water while minimizing peak stack temperatures. Optimizing the cooling will permit longer stacks to be used without the penalty of high thermal losses.