论文总字数：23523字

摘 要

材料表面改性是在对特别的材料进行人工处理，只改变其表面化学特性。处理方法有刷漆、化学反应和本文中的高电压技术。现代材料表面改性目的：通过以上的方法使得待处理的材料拥有之前没有的特性，比如憎水性、亲水性和耐污性等等。

本文研究对象在于等离子体射流装置的设计，同时更偏向于对材料内壁表面改性研究。等离子体射流，相对于其他放电方式有明显优势：一方面其放电反应不需要严格的外部环境而且产生大量活性粒子且具有较高电子能量，另一方面其通过射流管喷射等离子体对物体表面进行处理，这样其对材料形状、厚度没有特殊要求，处理范围更加广泛，应用前景更加广阔。

首先，本文先对不同材料内壁处理方案进行对比。通过分析比较支管装置和旋转装置各自的优势和劣势，加上考虑进气口经济性因素，来选择更优管子模型。在支管装置和旋转装置中，由于旋转装置进气量需求大，难以精确控制而且受外界干扰影响大；支管装置虽然要外加旋转电机但是能保证稳定有效喷涂效果，而且对于极细孔径支管还能做到精确定点材料处理。所以本文将对支管装置进行仿真模拟实验。

其次，在对支管装置进行COMSOL仿真实验时，选取支管位置、支管直径和支管长度三个为影响喷涂效果参数。通过各自单独变量对照实验，来选取最佳参数。同时本文还对极小孔径进行单独分析，来分析对单个点的材料改性实验。

最后，设计出实验室使用的实验系统，选取塑料水管作为处理对象，用纳秒脉冲电源作为激励源，辅气路进气量恒为1L/min，用示波器收集放电的电压电流参数。采用控制变量法进行实验，对每组实验进行Origin分析，比较放电的均匀性、效率和改性效果。

关键词：射流改性 射流装置 材料内壁处理 COMSOL仿真

Design and implementation of a jet modification device for material inner wall treatment

Abstract

The surface modification of materials can also be called material surface strengthening treatment. The purpose of modern material surface modification is to design and modify the material surface and matrix as a unified system, change the shape, chemical composition and organizational structure of the near surface layer of the material in the most economical and effective way, endow new composite properties, and realize new engineering applications with new functions.

The research object of this paper is the design of plasma jet device, and it is more inclined to study the surface modification of material inner wall. Compared with other discharge methods, plasma jet has obvious advantages: on the one hand, its discharge reaction does not need strict external environment and produces a large number of active particles with high electronic energy; on the other hand, it sprays plasma through jet pipe to treat the surface of the object, so it has no special requirements for the shape and thickness of the material, and the scope of treatment is more extensive.

First of all, this paper compares the treatment schemes of different materials. By analyzing and comparing the advantages and disadvantages of the branch pipe device and the rotating device, and considering the economic factors of the air inlet, a better pipe model is selected. In the branch device and rotating device, because of the large demand for air intake of rotating device, it is difficult to control accurately and is greatly affected by external interference; although the branch device is equipped with a rotating motor, it can ensure the stable and effective spraying effect, and it can also achieve the accurate fixed-point material treatment for the branch with very fine aperture. So this paper will carry on the simulation experiment to the branch device.

Secondly, the position, diameter and length of the branch pipe are selected as the parameters to affect the spray effect. The best parameters were selected through the independent variable control experiment. At the same time, this paper also analyzes the micro aperture separately to analyze the material modification experiment of single point.

Finally, the experimental system used in the laboratory is designed. The plastic water pipe is selected as the processing object, the nanosecond pulse power supply is used as the excitation source, the air intake of the auxiliary gas circuit is constant 1L / min, and the voltage and current parameters of the discharge are collected by the oscilloscope. The control variable method was used to carry out the experiment, and the origin analysis was carried out for each group of experiments to compare the uniformity, efficiency and modification effect of the discharge.

Keywords: jet modification; jet device; material inner wall modification；COMSOL

目 录

摘 要 I

Abstract II

第一章 绪论 1

1.1 研究背景 1

1.2 研究现状 2

1.2.1 射流改性研究现状 2

1.2.3 研究现状总结 4

1.3 本章小结 5

第二章 研究方案对比与实验装置选择 6

2.1 研究目标 6

2.2 研究思路 6

2.3 不同实验装置概念模型 7

2.3.1 支管装置图 7

2.3.2 旋转装置图 7

2.4 两方案的对比选择 8

2.5 小直径等离子体射流 9

2.6 仿真软件 10

2.6.1 三维模型的建立 10

2.6.2 仿真软件的选择 11

2.7 实验装置选择 11

2.7.1实验电源的选择 11

2.7.2实验测量装置 12

2.7.3诊断装置 12

2.7.4水接触角测量原理 13

2.8本章小结 14

第三章 装置射流体羽仿真模型 15

3.1 仿真目标 15

3.2 COMSOL数学模型的选择 15

3.3 COMSOL建模 17

3.3.1 几何建模 17

3.3.2 边界条件 17

3.3.3 网格 18

3.4 支管位置距离入气口建模仿真 18

3.5 支管直径变化建模仿真 21

3.6 支管长度建模仿真 23

3.7 不同支管长度下气体喷射效果与支管直径的关系 26

3.8 本章小结 27

第四章 射流反应器参数对放电特性影响实验研究 28

4.1 装置SolidWorks建模 28

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