阶跃喷嘴电弧等离子炬放电特性的实验研究

IF 2.6 3区 物理与天体物理 Q3 ENGINEERING, CHEMICAL
Kuan Li, Cheng Zhu, Yunfei Zhang, Zhaoyu Yu, Yuan Tian, Weidong Xia, Cheng Wang
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引用次数: 0

摘要

阶跃喷嘴电弧等离子体炬(SNAPT)具有高稳定性和高能量密度的优点,是一种很有前途的电弧源,但其微时间尺度的放电特性尚未得到充分研究。本研究设计并研究了 SNAPT,以探讨放电电流、气体流速和喷嘴形态对放电特性的影响。结果表明,当气体流量大于 4 Nm3/h 时,SNAPT 的伏安特性曲线呈上升趋势;当气体流量为 3 Nm3/h 时,曲线呈下降趋势。这一结果与弧根的位置有关,在大电流和低气体流量时会出现电弧收缩现象。SNAPT 的热效率随着电流的增大和气体流量的减小而降低,在实验参数范围内为 69.6% 至 82.3%。光学发射光谱结果表明,等离子体内部存在许多活性粒子。实验参数重粒子温度为 4851.5 至 9189.3 K,电子温度为 7846.9 至 10185.6 K,均符合玻尔兹曼分布,接近局部热力学平衡态。对比实验结果表明,圆柱形喷嘴的伏安特性递减,电压较高,但与阶梯形喷嘴相比,电压波动大,稳定性差。研究结果对该类型等离子炬的设计、运行参数选择和应用场景具有指导意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental Study of the Discharge Characteristics of a Stepped-Nozzle Arc Plasma Torch

Experimental Study of the Discharge Characteristics of a Stepped-Nozzle Arc Plasma Torch

Experimental Study of the Discharge Characteristics of a Stepped-Nozzle Arc Plasma Torch

The stepped-nozzle arc plasma torch (SNAPT) is a promising arc source due to the advantages of high stability and high energy density, but the micro-time scale discharge characteristics have not yet been adequately investigated. In this study, a SNAPT was designed and studied, in order to investigate the effects of discharge current, gas flow rate, and nozzle morphology on the discharge characteristics. The results show that the volt-ampere characteristics of the SNAPT have an increasing curve when the gas flow rate is greater than 4 Nm3/h, and a decreasing curve when the gas flow rate is 3 Nm3/h. This result is related to the position of the arc root, and an arc constriction phenomenon occurs at high current and low gas flow rate. The thermal efficiency of the SNAPT decreases with the increasing current and decreasing gas flow rate, ranging from 69.6 to 82.3% within the experimental parameters. The optical emission spectroscopy results show that there are many active particles inside the plasma. The experimental parameters of the heavy particle temperature of 4851.5 to 9189.3 K and the electron temperature of 7846.9 to 10185.6 K both correspond to the Boltzmann distribution and are close to the local thermodynamic equilibrium state. Comparative experimental results show that the cylindrical-nozzle has the decreasing volt-ampere characteristics and higher voltages, but has large voltage fluctuations and poor stability compared with the stepped-nozzle. The results of the study are of guiding significance for design, selection of operating parameters, and application scenarios for this type of plasma torch.

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来源期刊
Plasma Chemistry and Plasma Processing
Plasma Chemistry and Plasma Processing 工程技术-工程:化工
CiteScore
5.90
自引率
8.30%
发文量
73
审稿时长
6-12 weeks
期刊介绍: Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.
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