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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Influence of configuration and operating conditions on the electric arc instabilities of a plasma spray torch: role of acoustic resonance
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Influence of configuration and operating conditions on the electric arc instabilities of a plasma spray torch: role of acoustic resonance

机译：配置和工作条件对等离子喷枪电弧不稳定性的影响：声共振的作用

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摘要

A theoretical approach is proposed to explain the particularities of the power spectrum of a plasma spray torch voltage. This is founded on an acoustic resonance of the rear part of the plasma torch which is occupied by the cold gas before it reaches the arc region. The spectrum is characterized by the presence of a sharp peak in the range 3-8 kHz, with an amplitude that represents up to +/- 30% of the voltage mean value. The peak frequency presents an evolution that is governed by the torch operating conditions, the thermal properties of the plasma forming gas and the geometrical configuration of the electrode assembly. The theory is compared with experimental values of the peak frequency recorded for different operating conditions and torch configurations. The injection ring through which the gas is injected also plays an important role. The torch behaviour is carefully characterized in order to collect all the experimental data required for the analysis on the involved phenomena.
机译：提出了一种理论方法来解释等离子喷枪电压的功率谱的特殊性。这是基于等离子炬的后部的声共振，该等离子炬的后部在到达电弧区之前被冷气占据。该频谱的特征是在3-8 kHz范围内存在一个尖峰，其幅度代表电压平均值的+/- 30％。峰值频率呈现出一种变化，该变化受炬的运行条件，等离子形成气体的热特性以及电极组件的几何构型所控制。将该理论与针对不同工作条件和割炬配置记录的峰值频率的实验值进行了比较。通过其注入气体的注入环也起着重要作用。焊炬的行为经过仔细表征，以收集分析涉及现象所需的所有实验数据。

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