DEVELOPMENT OF COMPACT EXHUST GAS TREATMENT EQUIPMENT FOR DIESEL ENGINE USING DIELECTRIC BARRIER DISCHARGE

紧凑型介质阻挡放电柴油机废气处理装置的研制

• 批准号: 12680470
• 负责人: FUJIWARA Tamiya
• 金额: $ 2.37万
• 依托单位: IWATE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12680470/
• 关键词: PBII; PIIP; GLOW DISCHARGE; PULSED POWER; ION IMPLANTATION; SURFACE TREATMENT; PULSE DISCHARGE; FLUX; PIIP

The purpose of this project is to refine a three dimensional complex material, like the mold metal frame, by the surface treatment (cleaning, coating) and/or surface refining (ion implantation), making use of the combination of high repetitive pulse modulator for large capacity and high density glow plasma generation and pulse biasing for extraction of ions. The project was performed in the following three subjects to realize the purpose. (1) The first step is to grasp the heat flux from plasma into the material and plasma parameter of the pulsed glow discharge. (2) The second step is to develop a pulse modulator for plasma generation and bias voltage supply. (3) The third is the numerical simulation by the fluid modeling. The results are as follows.1. It was clarified that the plasma parameter of the pulsed glow discharge by probe measurement, current-voltage characteristics, and the spectroscopic analysis. The plasma density 3 x 10^<11> cm^<-3> was sustained over a period of 8 μs app … More roximately. The plasma temperature has increased form 450 ℃ to 650 ℃ in this period. This temperature rise generate the heat flux. Estimating the ratio of the heat flux to the input power, it was found that the ratio came up to 40 % approximately.2. Combining the SOS diode and inductive energy storage system, we produce the pulse generator for ion extraction from ultra thin theath, before the transition form ion matrix to Bohm theath. The specification of the pulse generator are output voltage -20 kV, repetition frequency hundreds Hz, and pulse width 60 ns. The pulse width is short enough compared with the Bohm theath formation time(1 μs).3. The numerical analysis of the 2D fluid model was progressed. It was found that the special plasma distribution was remarkable modified by the earth sealed which guard the electrode material to the suputtering. The probe measurement result of the plasma distribution was consistent with the numerical calculation. We also analyzed the ion number density making use of the chemical reaction models. In nitrogen cases, it was found that N_2^+ and N_4^+ are dominated in this reaction. Less

本项目的目的是通过表面处理（清洗、涂层）和/或表面细化（离子注入）来细化三维复杂材料，如模具金属框架，利用高重复脉冲调制器的组合来产生大容量和高密度辉光等离子体，并利用脉冲偏置来提取离子。为实现这一目标，本课题主要从以下三个方面进行研究。(1)第一步是掌握等离子体进入材料的热通量和脉冲辉光放电的等离子体参数。(2)第二步是研制用于等离子体产生和偏置电压供给的脉冲调制器。(3)第三部分是流体模型的数值模拟。研究结果如下：1.通过探针测量、电流-电压特性和光谱分析，阐明了脉冲辉光放电的等离子体参数。等离子体密度3 × 10^<11>cm^<-3>，持续8 μs app ...更多信息 rooms.在此期间，等离子体温度从450 ℃上升到650 ℃。这种温度上升产生热通量。估算了热流密度与输入功率的比值，发现该比值约为40%.将SOS二极管与电感储能系统相结合，研制出了一种用于超薄腔离子引出的脉冲发生器。脉冲发生器的输出电压为-20 kV，重复频率为几百Hz，脉冲宽度为60 ns。与玻姆腔形成时间（1 μs）相比，脉冲宽度足够短.对二维流体模型进行了数值分析。研究发现，在电极材料表面设置接地层，保护电极材料不受溅射的影响，显著地改变了等离子体的空间分布。等离子体分布的探针测量结果与数值计算结果一致。我们还利用化学反应模型分析了离子数密度。在氮的情况下，发现N_2^+和N_4^+在该反应中占主导地位。少

项目成果

K. Takaki, D. Kitamura, T. Fujiwara: "Characteristics of a high-current transient glow discharge in dry air"Journal of Physics D : Applied Physics. Vol.33. 1369-1375 (2000)

K. Takaki、D. Kitamura、T. Fujiwara：“干燥空气中高电流瞬态辉光放电的特性”物理学杂志 D：应用物理学。

K.Takaki D.Koseki, T.Fujiwara: "Heat flux distribution on a substrate in capacitively coupled radio-frequency discharges"Applied Physics Letters. 80・9(in press). (2002)

K.Takaki D.Koseki、T.Fujiwara：“电容耦合射频放电中基板上的热通量分布”应用物理快报 80・9（印刷中）。

K.Takaki, D.Koseki, T.Fujiwara: "Influence of a ground shield on heat flux in parallel plate plasma system"Journal of Physics D : Applied Physics. 33. 3060-3065 (2000)

K.Takaki、D.Koseki、T.Fujiwara：“接地屏蔽对平行板等离子体系统热通量的影响”物理学杂志 D：应用物理学。

K. Takaki, T. Kobayashi, T. Fujiwara: "Simple and inexpensive interferometry of shock wave developments from pulsed high-current discharge"Review of Scientific Instruments. Vol.71, No.3. 1548-1551 (2000)

K. Takaki、T. Kobayashi、T. Fujiwara：“脉冲高电流放电冲击波发展的简单且廉价的干涉测量”科学仪器评论。

K.Takaki, D.Taguchi, T.Fujiwara: "Voltage-current characteristics of high-current glow discharges"Applied Physics Letters. 78・18. 2646-2648 (2001)

K.Takaki、D.Taguchi、T.Fujiwara：“高电流辉光放电的电压-电流特性”应用物理快报 78・18 (2001)。