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空气等离子粉末喷涂中直喷嘴与斜喷嘴射流建模
Modeling of jet flows for straight and angled nozzles in air-plasma powder spraying
Thermophysics and Aeromechanics
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Springer Science+Business Media
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APS斜喷嘴射流建模：小件内表面喷涂
AI理解
要点 APS直/斜喷嘴射流数值建模：斜喷嘴用于小件内表面喷涂；冲击菱形坐标验证一致；壁冷却显著影响斜喷嘴射流焓。
能不能用 APS工艺的射流/喷嘴气动建模研究，对热喷涂内孔/小件喷涂喷嘴设计与工艺参数（距离、气流量）选择有直接参考价值。
存疑
- 建模研究，无涂层性能数据
- 验证基于射流气动坐标而非沉积效果
- 斜喷嘴几何细节需读全文
中文摘要
对直流等离子炬使用直喷嘴和斜喷嘴产生的等离子射流进行比较建模。对作者开发的斜喷嘴几何进行数值分析，该喷嘴用于小尺寸零件内表面的空气等离子喷涂粉末涂层。研究了高温等离子气体射流与冷载气和聚焦气流在喷嘴内混合的气体动力学。通过等离子炬欠膨胀工况下沿射流长度冲击菱形坐标的对比，验证了所提出的气动模型和计算算法，与全尺寸实验表现出可接受的一致性。计算了壁面冷却对射流焓的影响，并证明在斜喷嘴情况下其作用显著。确定了射流横截面速度和温度分布呈现轴对称均匀形态时的距离和最佳气体流量。
查看英文摘要
Comparative modeling of plasma jets generated by a direct-current plasma torch using straight and angled nozzles was carried out. The geometry of the angled nozzle developed by the authors was numerically analyzed; this nozzle was created for air-plasma spraying of powder coatings onto the inner surfaces of small-sized parts. The gas dynamics of the mixing of a high-temperature plasma gas jet with flows of cold carrier and focusing gases in the nozzle was studied. The proposed aerodynamic model and calculation algorithm were validated by comparison of the coordinates of shock diamonds along the jet length in the off-design mode of plasma torch operation, which showed acceptable agreement with full-scale experiments. The effect of wall cooling on the jet enthalpy was calculated, and its significant role was demonstrated in the case of using an angled nozzle. The distances and optimal gas flow rates at which the velocity and temperature profiles along the jet cross-section acquire an axisymmetric and uniform appearance were determined.
摘要中给出的工艺参数
| 其他 | 直流等离子炬直喷嘴与斜喷嘴对比；小尺寸零件内表面喷涂 |
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原文依据
查看原文依据
- Comparative modeling of plasma jets generated by a direct-current plasma torch using straight and angled nozzles was carried out.
- The proposed aerodynamic model and calculation algorithm were validated by comparison of the coordinates of shock diamonds along the jet length in the off-design mode of plasma torch operation, which showed acceptable agreement with full-scale experiments.
- The effect of wall cooling on the jet enthalpy was calculated, and its significant role was demonstrated in the case of using an angled nozzle.
阅读原文 →
DOI: 10.1134/s086986432603011x