| 摘要: |
| 运用CFD软件，对高速电弧喷枪的流场进行了模拟。通过分析计算结果，将射流分为电弧区、核心区、卷吸区和湍流区4个部分。电弧区内部速度和温度起伏剧烈，但对其外3个区域的流场速度分布影响不大，对轴线温度影响为20～40 K。电弧区内部最高温度为6 800 K，分布在阴极表面上，阴极的平均温度为4 250 K，从阴极到阳极，电流密度和电弧温度都逐渐降低，阳极的平均温度为538 K。 |
| 关键词: 高速电弧喷涂 数值模拟 计算流体力学 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Numerical Study of the Plasma Region of High Velocity Wire-Arc Spray |
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DONG Rui-tao, SUO Shuang-fu
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Department of Precise Instrument & Mechanics, Tsinghua University, Beijing, 100084
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| Abstract: |
| With the application of Fluent, the jet flow field of a wire-arc spraying gun was simulated and computed, which could be characterized by four regions: plasma region, core region, entrainment region and the fully turbulent region. The results showed that the plasma region had very limited effect on the other regions. It only caused 20~40 degree rising of the temperature on the axis of jet flow. But in the plasma region itself, the velocity and temperature were severely fluctuated, up to 1 600 m/s and 6 800 K respectively. From anode to cathode, the average temperature was gradually reduced from 4250 K to 538 K. |
| Key words: high velocity wire-arc spray numerical simulation CFD |
