Investigation on the Clogging Behavior and Additional Wall Cooling for the Axial-Injection Cold Spray Nozzle
Investigation on the Clogging Behavior and Additional Wall Cooling for the Axial-Injection Cold Spray Nozzle
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DOI：
10.1007/s11666-015-0227-1
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发表时间：
2015-02
影响因子：
3.1
通讯作者：
Xudong Wang;Bo Zhang;J. Lv;Shuo Yin
中科院分区：
文献类型：
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作者：
Xudong Wang;Bo Zhang;J. Lv;Shuo Yin
在冷喷涂过程中，当喷涂低熔点材料时，铝，大大降低了工作效率。本文对喷嘴堵塞的原因进行了全面的研究，并对一种防止喷嘴堵塞的国产喷嘴冷却装置进行了评价。采用计算流体力学技术作为主要的研究方法，并进行了必要的实验验证。结果表明，颗粒弥散和近喉道区壁面高温是造成喷嘴堵塞的两个主要因素。数值计算结果还表明，自制的冷却装置可以显著降低喷管壁面温度，这一点得到了实验测量的验证。此外，铝镀层堆焊实验进一步表明，附加冷却装置能真正防止喷嘴堵塞。
During the cold spray process, nozzle clogging always happens when spraying low-melting point materials, e.g., aluminum, significantly decreasing the working efficiency. In this paper, a comprehensive investigation was carried out to clarify the reason for inducing nozzle clogging and then to evaluate a home-made nozzle cooling device for preventing nozzle clogging. Computational fluid dynamics technique was employed as the main method with some necessary experiment validation. It is found that the particle dispersion and the high-temperature nozzle wall at the near-throat region are two dominant factors that cause nozzle clogging. The numerical results also reveal that the home-made cooling device can significantly reduce the nozzle wall temperature, which was validated by the experimental measurement. Besides, the aluminum coating build-up experiment further indicates that the additional cooling device can truly prevent the nozzle clogging.