摘要：随着我国工业化进程的不断提高，粉尘问题也愈加突出。粉尘的危害不仅体现在对人体健康的威胁和对机器、设备的磨损上，更体现其在火灾爆炸方面的危险性。本论文旨在通过查阅资料文献，了解国内外风管内粉尘运动特性的研究现状。以铝合金粉为研究对象，将水平风管与PIV系统结合，搭建实验平台，进行通风管道内沉积粉尘再次扬起的实验研究。通过实验数据分析粉尘颗粒物在风管内的传播特性，进而对受限空间内粉尘运动规律性作出初步结论。47468

毕业论文关键词：铝合金粉尘；再次扬尘；PIV系统

Experimental Study on Secondary Flying of Deposit Dust in Ventilation duct

Abstract: With the improvement of the level of industrialization, the dust problem is becoming more and more serious. The dust harm is not only to human health and wear of machines, equipments, but also reflected in the aspect of the fire and explosion hazard. The purpose of this paper is, through consulting literature, to understand the research status of characteristics of the dust movement in ventilation ducts at home and abroad. Aluminum alloy powder is as the research object, horizontal ventilation ducts are combined with the PIV system to build the experimental platform, then perform the experimental studies on secondary flying of deposit dust in ventilation duct. Through experimental data, find out the transmission characteristics of particles in ventilation ducts, and then to make a preliminary conclusion of the regularity of the dust movement in confined space.

Key Words: Aluminum alloy powder; Secondary flying of deposit dust; PIV system

 目录

1. 绪论 1

1.1 课题背景 1

1.2 风管内沉积粉尘的研究现状 2

1.3 激波扬尘实验研究 2

1.4 气固两相理论 3

1.5 粒子图像测速（PIV）技术 3

1.5.1 PIV技术基本原理 4

1.5.2 PIV技术在气固两相流场中的应用 4

1.5.3 PIV技术的前景 4

1.6 研究的目标和意义 5

1.7 研究内容及方法 5

2. 风管内颗粒物运动特性 6

2.1 风管内颗粒物受力分析 6

2.1.1 重力 6

2.1.2 拖拽力 6

2.1.3 浮力 7

2.1.4 扩散力 7

2.1.5 其他作用力 7

2.2 颗粒物与管壁的相互作用 8

2.2.1 碰撞与反弹 8

2.2.2 黏附 9

2.2.3 二次悬浮 9

2.3 影响管道内颗粒物沉积的因素 9

2.3.1 粒径 9

2.3.2 风速 10

2.3.3 管道特性 10

2.3.4 其他影响 10

2.4 本章小结 10

3. 实验装置及方法 11

3.1 铝合金粉尘爆炸极限测定实验 11

3.1.1 实验设备