The electro-acoustic transition process of pulsed corona discharge in conductive water
The electro-acoustic transition process of pulsed corona discharge in conductive water
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DOI：
10.1088/0022-3727/47/25/255204
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发表时间：
2014-06-25
影响因子：
3.4
通讯作者：
Yan, Keping
中科院分区：
文献类型：
--
作者：
Huang, Yifan;Yan, Hui;Yan, Keping
从放电前分析、含等离子体气泡的热力学和动力学过程、声学特征和能量分配等方面对导电水中脉冲电晕放电进行了理论和实验研究。通过求解理想气体方程、瑞利方程和能量平衡方程，模拟了气泡内的总粒子密度和电子密度、内部温度和压力、气泡半径和气泡壁马赫数。在自制的实验装置上，用高速电荷耦合器件相机测量了气泡半径。间接计算了声波波形及其功率谱密度。通过使用多种诊断工具，同时记录了负载的电学参数、等离子体的光发射和声波波形。在每脉冲5 ~ 30j的能量输入范围内，气泡半径和声学特征的模拟结果与实验结果吻合较好。通过模拟和实验数据分析了能量转变过程中不同类型的终端或中间体。电声效率在0.8% ~ 1.9%之间变化，而放电能量大部分被电路损耗、焦耳加热和热辐射消耗，或在水中转化为动能。
A pulsed corona discharge in conductive water is studied theoretically and experimentally via pre-discharge analysis, thermodynamic and dynamic processes of a plasma-containing bubble, an acoustic signature and energy partitioning. The total particle density and electron density inside the bubble, internal temperature and pressure, bubble radius and bubble wall Mach number are simulated by solving a set of equations including the ideal gas equation, Rayleigh equation and energy balance equation. The bubble radius is also measured by a high-speed charge-coupled device camera on a homemade experimental device. The acoustic waveforms and their power spectral density are calculated indirectly. By using several diagnostic tools, the electrical parameters of the load, light emission from the plasma and acoustic waveforms are recorded simultaneously. Simulation and experimental results of the bubble radius and acoustic signature agree reasonably well over the range of energy inputs from 5 to 30 J per pulse. Different kinds of terminations or intermediates of the energy transition process are analysed through simulation and experimental data. The electro-acoustic efficiency varies from 0.8% to 1.9%, while most of the discharge energy is consumed by circuit loss, Joule heating and thermal radiation, or is transformed into kinetic energy in the water.