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首页> 外文会议>2003 International Thermal Spray Conference Vol.2; May 5-8, 2003; Orlando, Florida, USA >Application of CFD for Wire-Arc Nozzle Geometry Improvement
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Application of CFD for Wire-Arc Nozzle Geometry Improvement

机译：CFD在改进线弧喷嘴几何形状中的应用

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摘要

The present study was devoted to the optimization of the nozzle exit geometry of a TAFA 9000 wire-arc spray gun. Computational Fluid Dynamic was first used in order to examine the effect of different nozzle configurations, considering small changes operated on the original design. Finally, one of the modified geometries tested numerically was retained in view of the CFD results and the corresponding new nozzle was machined. In a second step, experiments were performed in order to observe the effect of the new design on in-flight droplet characteristics. For this part, a comparison was made between the original design and the modified one for two different type wires (a steel wire and a stainless steel cored wire). These experiments were performed using the well known DPV 2000 device for different operating conditions. The results indicate that the modified design provides a significant increase in the droplet velocity (about 20% higher for the new design) with unchanged thermal spray parameters, indicating that the gun exit design may have a strong influence on inflight characteristics of the droplets. Moreover, droplets were collected in water and the size distribution was analyzed.
机译：本研究致力于优化TAFA 9000线弧喷枪的喷嘴出口几何形状。考虑到对原始设计进行的小改动，首先使用计算流体动力学来检查不同喷嘴配置的效果。最后，考虑到CFD结果，保留了经过数值测试的一种修改的几何形状，并加工了相应的新喷嘴。第二步，进行实验以观察新设计对飞行中液滴特性的影响。对于这一部分，针对两种不同类型的电线（钢丝和不锈钢芯钢丝）进行了原始设计和改进设计之间的比较。这些实验是使用众所周知的DPV 2000设备针对不同的运行条件进行的。结果表明，在不改变热喷涂参数的情况下，改进后的设计可显着提高液滴速度（对于新设计，新液滴速度将提高约20％），这表明喷枪出口设计可能会对液滴的飞行特性产生重大影响。此外，将水滴收集在水中并分析尺寸分布。

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