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| 喷枪结构对低温超音速火焰喷涂颗粒飞行特性的影响 |
| Influence of torch geometry on particles behavior in the low-temperature oxygen-fuel spray process |
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| DOI： |
| 中文关键词: 低温超音速火焰喷涂 喷枪结构 颗粒飞行特性 数值模拟 |
| 英文关键词:low-temperature oxygen-fuel spray torch geometry particle behavior numerical simulation |
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| 中文摘要: |
| 建立了低温超音速火焰喷涂传热和流动模型,对喷涂过程的焰流和颗粒的运动加热历程进行了模拟分析.研究了三种不同结构的喷枪对焰流速度与温度分布、不同粒径颗粒飞行特性的影响.模拟结果表明,粒径为20 μm的Cu颗粒在撞击基板时能达到临界速度,且温度低于熔点,有利于沉积并减少了颗粒氧化;枪管的扩张率对喷涂颗粒的速度影响不大,而对颗粒温度的影响较大;延长扩张段的长度代替平直枪管有利于在保证颗粒速度的同时提高颗粒的温度. |
| 英文摘要: |
| The Low-Temperature Oxygen Fuel spray process (LTOF) is a modification of High Velocity Oxygen-Fuel (HVOF).In this paper,a two-dimensional mathematical model was established to simulate the heat and momentum transfer between the supersonic flow and particles in LTOF.Three nozzles of different type were studied and the effects of nozzle structure on the temperature field and velocity distribution of the gas were investigated.In addition,the velocity and temperature of copper particles were acquired.The simulation results showed that Cu particles of 20 μm diameter can reach the critical velocity when they hit the substrate and their temperature is lower than the melting point,which is beneficial for forming high quality coating.The nozzle expansion rate has little effect on the particle velocity,but it has a great influence on the particle temperature.Increasing the length of nozzle expansion can increase the particle temperature. |
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