等离子喷涂枪喷嘴能量分布的数值模拟

为了给等离子枪体的设计提供理论依据，利用FLUENT软件对等离子喷涂枪水冷却流动和换热进行了数值建模与计算.由于等离子枪体的热压缩效应主要是靠内部水冷系统完成，理想的水冷系统应该能尽快地将等离子束流所产生的热量带走，因此，对等离子枪体冷却水流场进行了研究，得出了喷嘴的温度场和水流速度场，明确了喷嘴的能量分布.研究结果表明，等离子枪体损失功率的一部分能量集中在阳极斑点，其他均匀分布在喷嘴上.其结论对等离子喷涂枪的设计具有参考价值.

Numerical simulation on energy distribution of plasma spraying gun nozzle

In order to provide the theoretical foundation for the design of plasma gun, the numerical modeling and calculating for the cooling water flow and heat transfer in plasma spraying gun were performed with FLUENT software. Because the thermo compression effect of the plasma gun is mainly completed by inner water cooling system, and the ideal water cooling system should be able to take away the heat produced by the plasma beam as soon as possible. Therefore, the research for the cooling water flow field in the plasma gun was conducted. Both temperature field and water flow velocity field in the nozzle were obtained, and the energy distribution of the nozzle was identified. The results show that a part of loss power of the plasma gun is concentrated on the anode spot and the remaining energy uniformly distributes on the nozzle. The present conclusion is of a certain reference value for the design of plasma spraying gun.