Numerical analysis of plasma and shock wave characteristics of the discharge in liquid
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摘要: 以能量平衡方程为基础，采用不同的电导率唯象模型描述了液相放电等离子体圆柱形通道特性，得到了通道内半径、温度、电阻、电流和耗散能量随时间的变化关系，还给出了距离放电间隙中心一定距离处的冲击波压力变化，并与前人利用等离子体通道球状模型计算得到的结果进行了比较。结果表明：把等离子体通道看成球状和看成圆柱状在描述通道压力和通道半径时差异显著，而在描述其他物理特性时差别不大；三种电导率模型在描述等离子体通道物理特性时，变化趋势大体相同，而在描述激波特性时，电导率模型σ2更符合实际；通过对比电学参数与压力参数的变化，就可以在实验中根据实验数据以及具体的研究问题进行模型的适用性选择。Abstract: Based on conservation equation of energy, channel characteristics of the cylindrical geometry of the plasma were described under different conductivity models. The variation of the channel radius, temperature, resistance, current and dissipated energy with time is obtained. The variation of shock wave pressure at a certain distance from the center of the discharge gap is also given. The results are compared with those calculated based on the spherical geometry of the plasma channel. The purpose of this paper is to provide a reference for further study of physical and chemical characteristics and shock wave characteristics of the discharge in liquid. The results show that there is significant difference in the channel pressure and radius when the plasma channel is respectively regarded as a sphere and a cylinder, but there is little difference in other physical properties. When the physical characteristics except the shock wave characteristic are described by using three conductivity models, the change trend is almost the same, while the shock wave characteristic is described more accurately by using the conductivity model σ2. By comparing the changes of electrical parameters and pressure parameters, the applicability of the model can be selected according to the experimental data or specific research problems, which also provides a reference for further study of the physicochemical characteristics and shock wave characteristics of discharge plasma in liquid.
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Key words:
- discharge in liquid /
- plasma channel /
- shock wave characteristics /
- conductivity /
- high voltage
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图 2 液相放电等离子体实验回路图
Figure 2. Schematic diagram of the experimental device by electrical discharge plasma in water
图 4 不同模型下等离子体通道电学特性的仿真结果
Figure 4. Simulation results of electrical characteristic of plasma channel under different model
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[1] 孙冰. 液相放电等离子体及其应用[M]. 北京: 科学出版社, 2013.Sun Bing. Discharge plasma in liquid and its application[M]. Beijing: Science Press, 2013 [2] 张辉, 蔡志翔, 陈安明, 等. 液相放电等离子体破岩室内实验与破岩机理[J]. 石油学报, 2020, 41(5):615-628. (Zhang Hui, Cai Zhixiang, Chen Anming, et al. Experiments and mechanism of rock breaking by the plasma shock wave generated by underwater discharge[J]. Acta Petrolei Sinica, 2020, 41(5): 615-628 doi: 10.7623/syxb202005010 [3] 刘云龙, 王志刚, 汪桐, 等. 等离子体协同絮凝降解乳化油废水COD的研究[J]. 安徽理工大学学报(自然科学版), 2019, 39(5):64-68. (Liu Yunlong, Wang Zhigang, Wang Tong, et al. Study on COD degradation of emulsified oil wastewater by plasma co-flocculation[J]. Journal of Anhui University of Science and Technology(Natural Science), 2019, 39(5): 64-68 [4] 陈景秋, 韦春霞, 邓艇, 等. 体外冲击波碎石技术的力学机理的研究[J]. 力学进展, 2007, 37(4):590-599. (Cheng Jingqiu, Wei Chunxia, Deng Ting, et al. Studies on mechanical mechanism about stone comminution and tissue trauma in extracorporeal shock wave lithotripsy[J]. Advances in Mechanics, 2007, 37(4): 590-599 [5] 左公宁. 水中脉冲电晕放电的某些特性[J]. 高电压技术, 2003, 29(8):37-38. (Zuo Gongning. Some properties of the impulse corona discharge in water[J]. High Voltage Engineering, 2003, 29(8): 37-38 doi: 10.3969/j.issn.1003-6520.2003.08.015 [6] 李宁, 雷开卓, 黄建国, 等. 采用时变电阻的水下高压放电模型[J]. 高电压技术, 2009, 35(12):3060-3064. (Li Ning, Lei Kaizhuo, Huang Jianguo, et al. Model of underwater high-voltage discharge using time-varying resistance[J]. High Voltage Engineering, 2009, 35(12): 3060-3064 [7] Timoshkin I V, Fouracre R A, Given M J, et al. Hydrodynamic modelling of transient cavities in fluids generated by high voltage spark discharges[J]. Journal of Physics D: Applied Physics, 2006, 39(22): 4808-4817. doi: 10.1088/0022-3727/39/22/011 [8] 李培芳, 金方勤. 液中放电冲击波和等离子体参数的计算[J]. 浙江大学学报(自然科学版), 1994(1):27-35. (Li Peifang, Jin Fangqin. Calculations of shock wave and plasma parameters of the discharge in liquid[J]. Journal of Zhejiang University(Natural Science), 1994(1): 27-35 [9] 蒋杰灵, 兰生, 杨嘉祥. 水中脉冲放电等离子体特性数值解析[J]. 哈尔滨理工大学学报, 2008(5):107-111. (Jiang Jieling, Lan Sheng, Yang Jiaxiang. Numerical analysis of the plasma characteristics of pulsed discharge in water[J]. Journal of Harbin University of Science and Technology, 2008(5): 107-111 doi: 10.3969/j.issn.1007-2683.2008.05.029 [10] Cook J A, Gleeson A M, Roberts R M, et al. A spark-generated bubble model with semi-empirical mass transport[J]. The Journal of the Acoustical Society of America, 1997, 101(4): 1908-1920. doi: 10.1121/1.418236 [11] Roberts R M, Cook J A, Rogers R L, et al. The energy partition of underwater sparks[J]. The Journal of the Acoustical Society of America, 1996, 99(6): 3465-3475. doi: 10.1121/1.414993 [12] Eubank P T, Patel M R, Barrufet M A, et al. Theoretical models of the electrical discharge machining process. III. The variable mass, cylindrical plasma model[J]. Journal of Applied Physics, 1993, 73(11): 7900-7909. doi: 10.1063/1.353942 [13] Liu S W, Liu Y, Ren Y J, et al. Influence of plasma channel impedance model on electrohydraulic shockwave simulation[J]. Physics of Plasmas, 2019, 26: 023522. doi: 10.1063/1.5064847 [14] Fedorov V M. High power nanosecond discharge channel in water[M]. New York: Megagauss Fields and Pulsed Power Systems. 1990. [15] Ziman J M. Principles of the theory of solids[M]. Cambridge: Cambridge University Press, 1972. [16] Warne L K, Jorgenson R E, Lehr J M. Resistance of a water spark[R]. SAND2005-6994, 2005. [17] Liu S, Liu Y, Ren Y, et al. Characteristic analysis of plasma channel and shock wave in electrohydraulic pulsed discharge[J]. Physics of Plasmas, 2019, 26: 93509. doi: 10.1063/1.5092362 [18] Spitzer L J Jr. Physics of fully ionized gases[J]. New York: John Wiley & Sons, 1962: 136-143. [19] Kratel A W H. Pulsed power discharges in water[D]. Pasadena: California Institute of Technology. 1996. [20] 王一博. 水中等离子体声源的理论与实验研究[D]. 长沙: 国防科学技术大学, 2012.Wang Yibo. Theoretical and experimental study of the underwater plasma acoustic source[D]. Changsha: National University of Defense Technology, 2012 [21] Braginskii S I. Theory of the development of a spark channel[J]. Soviet Phys JETP, 1958, 34 (6): 1068-1074. [22] Touya G, Reess T, Pecastaing L, et al. Development of subsonic electrical discharges in water and measurements of the associated pressure waves[J]. Journal of Physics D: Applied Physics, 2006, 39(24): 5236-5244. doi: 10.1088/0022-3727/39/24/021 -
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