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The Effect of Pulse Parameters on Helium Plasma Bullet Distribution Properties |
Zhao Yong1,2, Wang Ruixue2, Zhang Cheng2,3, Zheng Shuhe1, Shao Tao2,3 |
1. College of Mechanical and Electronic Engineering Fujian Agriculture and Forestry University Fujian 350002 China; 2. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China; 3. University of Chinese Academy of Sciences Beijing 100049 China |
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Abstract In this paper, the influence of pulse waveform on the propagation characteristics of atmospheric pressure plasma jet bullets was studied. Furthermore, the dependence of spatial-temporal distribution of plasma bullet on the electric field was investigated. The experimental results showed that the applied parameters affected plasma bullet behavior in different ways. The pulse with short rise time broke down at over high voltage, which produced a high electric field. In turn, the radius of plasma bullet was larger and the velocities were higher. The pulse width and the pulse fall time affected the overall electric field by forming an opposite electric field caused by residual charges. The plasma jet length decreased when pulse width was smaller than 10μs. However, when plasma jet length was larger than 10μs, the residual charges were saturated and plasma jet length kept constant. When the pulse fall time increased, the plasma bullet dissipated in a smaller rate and showed an obvious “tail”. The different pulse fall time might affect the electric field distribution by an opposite electric field formed by residual charges. Finally, the distribution of electric field calculated by spectral emission ratio method was consistent with the length of the plasma plume and the behavior of plasma bullet.
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Received: 23 May 2018
Published: 02 September 2019
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