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清华大学学报(自然科学版)  2014, Vol. 54 Issue (1): 68-72    
  论文 本期目录 | 过刊浏览 | 高级检索 |
压力对双射流电弧等离子体特性的影响
吴贵清1,葛楠1,杨安1,2,李和平1(),包成玉1
2. 南方医科大学 生物医学工程学院, 广州 510515
Effects of pressure on the characteristics of dual-jet dc arc plasmas
Guiqing WU1,Nan GE1,An YANG1,2,Heping LI1(),Chengyu BAO1
1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2. Biomedical Engineering Institute, Southern Medical University, Guangzhou 510515, China
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摘要 

该文采用实验测量方法研究了气体压力对双射流直流电弧等离子体弧电压、放电稳定性及等离子体电弧-射流区二维投影温度场的影响规律。通过引入可见光测温技术,对不同工况下的热等离子体放电图像进行采集,并采用二值化阈值分割方法求取投影温度场对应的等灰度线,利用8方向Freeman链码对特定边界进行描述,从而对热等离子体电弧-射流稳定性进行评估。研究结果表明: 在其他参数保持不变的情况下,随着反应器内工作压力的降低,电弧-射流区二维投影温度场高温区面积增大,同时,电弧的稳定性也会受到一定影响; 但随着工作气体流量的增大,反应器内工作压力对电弧-射流二维投影温度场高温区面积变化的影响减弱; 在本文实验研究参数范围内压力对弧电压的影响较小。

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吴贵清
葛楠
杨安
李和平
包成玉
关键词 压力双射流热等离子体电弧    
Abstract

This paper experimentally studies the influence of the operation pressure on arc voltages, discharge stabilities and projective areas of dual-jet dc arc 2-D high-temperature plasma regions. The visible pyrometry, the contour extraction method with the variable binary thresholding technique, and an eight-direction Freeman chain coding technique were used based on the recorded digital discharge images to quantitatively in situ describe the 2-D grayscale contour distributions of the arc-jet plasmas and the discharge stabilities during discharge processes. Experimental results show that with other parameters being unchanged, the 2-D high-temperature region of the arcjet increases with decreasing operation pressure, which also affects the discharge stabilities of the plasmas. The results also show that with increasing argon flow rate, the differences of the arcjet 2-D high-temperature region areas at different operation pressures decease, while the influences of the operation pressure on the arc voltage are not significant within the parameter ranges studied in this paper.

Key wordspressure    dual-jet thermal plasma    arc
收稿日期: 2011-05-06      出版日期: 2015-04-16
ZTFLH:     
基金资助:国家自然科学基金资助项目 (11035005)
引用本文:   
吴贵清, 葛楠, 杨安, 李和平, 包成玉. 压力对双射流电弧等离子体特性的影响[J]. 清华大学学报(自然科学版), 2014, 54(1): 68-72.
Guiqing WU, Nan GE, An YANG, Heping LI, Chengyu BAO. Effects of pressure on the characteristics of dual-jet dc arc plasmas. Journal of Tsinghua University(Science and Technology), 2014, 54(1): 68-72.
链接本文:  
http://jst.tsinghuajournals.com/CN/  或          http://jst.tsinghuajournals.com/CN/Y2014/V54/I1/68
  实验装置结构示意图
  不同结构的电极结构示意图及照片
  不同压力下等离子体典型的放电图像、相应的等灰度线分布及φ=159等灰度线对应的链码图
  不同压力下等离子体高温区面积随工作气体流量的变化规律
  不同反应器工作压力下弧电压随工作气体流量变化规律
  不同工作压力下δ1δ2随时间的变化规律
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