大面积双极性纳秒脉冲气-液弥散放电稳定性控制及杀菌灭藻中活性物种诊断研究

Nanosecond pulse gas-liquid diffuse discharge in environmental protection, national defense, and medicine presents a more and more important application value, has become one of the important research topics in these fields. In recent years, the researchers for nanosecond pulse gas-liquid discharge have carried out some research work, but there are still some problems to be solved, especially produce large area nanosecond pulse gas-liquid diffusion discharge plasma and discharge instability control research is not thorough, in experiment and theory of gas-liquid two aspects the generating mechanism of diffuse nanosecond pulse discharge plasma and mode conversion regularity is still a lack of clear understanding. This project intends to use rapid ICCD camera, emission spectrum, optical cavity ring-down spectroscopy,absorption spectroscopy , voltage and current testing technology for generating the large area of gas-liquid diffuse nanosecond pulse discharge the physical mechanism of in-depth research, Focused on producing large area of gas-liquid diffusion nanosecond pulse discharge and the basic rule of stability control. By comparison with the theoretical analysis, numerical simulation, the thorough reveals large area of nanosecond pulse gas-liquid diffuse discharge plasma formation mechanism. Put forward the appropriate physical model and the guiding principle and technical method of inhibition of instability. And further diagnoses the OH and other important active species in gas-liquid diffusion discharge in the sterilization and algae.

纳秒脉冲气-液弥散放电在环保、生物医学及纳米制造等领域呈现出越来越重要应用价值，已经成为这些领域重要研究课题之一。近年来研究者对纳秒脉冲气-液放电已经开展了一些基础研究工作，但仍然存在一些亟待解决的突出问题，尤其是产生大面积纳秒脉冲气-液弥散放电等离子体以及放电不稳定性控制研究尚不深入，在实验和理论两方面对纳秒脉冲气-液弥散放电产生机理和模式转换规律还缺乏清晰认识。本项目拟采用快速ICCD摄像、发射光谱、光腔衰荡光谱、吸收光谱、电压、电流测试等技术相结合对产生大面积纳秒脉冲气-液弥散放电的物理机制进行深入研究，重点研究大面积纳秒脉冲气-液弥散放电的产生和稳定性控制的基本规律。通过与理论分析、数值模拟比较，深入揭示大面积纳秒脉冲气-液弥散放电等离子体形成机理。提出恰当物理模型和给出抑制不稳定性的指导原则和技术方法。并对纳秒脉冲气-液弥散放电等离子体在杀菌灭藻中OH等重要活性物种进行诊断研究。

本课题按照研究目标研究了双极性高压纳秒脉冲在大气压下针阵列-板式电极、多阵列针-板式电极结构对液体静态和流动状态下在液体表面产生大面积气-液弥散放电稳定性以及在液体内部产生气泡放电的稳定性控制的基本规律，掌握了大面积气-液弥散放电转变为丝状放电或弧光放电的不稳定性主动控制方法，并对高压纳秒脉冲气-液弥散放电等离子体电学特性、等离子体气体温度、电子密度、活性物种浓度等进行了定量诊断，研究了大气压高压纳秒脉冲气-液弥散放电的主要外部参数对实现大气压下在液体表面产生大面积气-液两相弥散放电等离子体以及在液体内部产生气泡放电稳定运行的影响，并对静态液体和流动液体中的白色念珠菌、大肠杆菌、真菌、放线菌等进行了杀灭研究，完成了对工业应用的基础研究工作。