等离子喷涂枪喷嘴不同水冷方式的数值分析

Numerical analysis on different nozzle water-cooling ways of plasma spraying gun

为了分析等离子喷涂枪喷嘴水冷却系统的冷却效果,减少喷嘴的烧损现象,利用FLUENT数值模拟软件,基于计算流体动力学和数值传热学的方法,采用压力耦合方程组的半隐式算法(即SIMPLE算法),在保持喷嘴水冷却系统结构不变的情况下,设计了第1种水冷方式;通过调换进、出水道位置形成第2种水冷方式;在此基础上,理论设计了另外2种水冷方式,着重建模分析了喷嘴壁面温度场和其不同水冷方式下的速度场.通过比较得出了较合理的水冷方式,减少或消除了冷却死水区域,达到进一步冷却喷嘴的目的,同时分析了后2种方式应用于实际的可行性.分析结果表明,采用数值模拟技术能够比较准确地模拟喷嘴水冷却系统的有关特性,可进一步优化设计喷嘴水冷却系统.

In order to analyze the cooling effect of nozzle water-cooling system of plasma spraying gun and avoid the burning damage of the nozzle,the FLUENT software was used for the numerical simulation based on computational fluid dynamics ( CFD) and numerical heat transfer methods as well as with SIMPLE ( semi-implicit method for pressure-linked-equations) algorithm.The first kind of water-cooling way was designed without changing the structure of nozzle water-cooling system.Through transposing the position of the...