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摘要超细干粉灭火剂作为一种高效环保的灭火剂，已经被广泛的关注，人们更多的是围绕超细干粉的灭火性能开展研究，而对于其在管程内流动特性的研究则较少，目前对于超细干粉灭火剂在管路内流动的沿程压力损失特性数据较为匮乏。为此，本文开展超细干粉灭火剂管内流动沿程压力损失特性的研究，其结果有益于指导超细干粉灭火系统管网的设计。
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本毕业论文对气固比、起始压力，喷口直径和管路长度等喷放条件进行了实验对比分析，确定干粉灭火剂的适宜喷放条件。在自行建立的一套干粉沿程流动压力测试系统上，以碳酸氢钠超细干粉为实验材料，针对干粉沿程流动过程中的气固两相混合问题，进行了正交实验研究，实验确定了喷射系统各参数与压力损失之间的关系：在喷放条件一定的情况下，压力损失随着装填干粉量的增加先减小后增大，随着喷口直径的增大而增大，并且在管路长度增加时呈现出先减小后增大的趋势。在实验过程中还发现喷射时间受到装粉量的影响，装粉量越大，喷射时间越长。8984
关键词: 超细干粉, 管内流动, 气固比, 沿程压力损失
毕业设计说明书（论文）外文摘要
Title the characteristics about pressure loss in the pipeline of ultra-fine-powder automatic fire extinguishing
Abstract
Ultra-fine-powder automatic fire extinguishing as a kind of more advanced type extinguisher, have been widely attention. People are more care of ultra-fine-powder automatic fire extinguishing properties than the characteristics ultra-fine-powder automatic fire extinguishing flowing in the line. At present for the pressure loss characteristic data of ultra-fine-powder extinguisher flowing along in the line is scarce. Therefore, this article in super fine powder extinguisher along the riser pipe flow pressure loss characteristics, and the results are beneficial to the guidance super-fine-powder fire system design.
Spewing out in certain conditions, in certain Blow conditions, the pressure loss along with the increase in the amount of packing powder decreases and then increases as the nozzle diameter increases with increasing, and the pipe length increases, showing first decreases and then increases. During the experiment found that the injection time by the impact of the loaded amount of powder, the greater the amount of powder, the longer the injection.
Key words : Ultra-fine-powder, flow in pipe , gas-solid , loss of pressure along the pipe
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目录
1 绪论 1
1.1 引言 1
1.2 超细粉体的概念和特性 1
1.2.1 超细干粉灭火剂的灭火机理 1
1.2.2 超细干粉灭火剂的主要优势[4] 2
1.2.3 超细干粉的主要应用场所 3
1.3 超细干粉灭火剂的应用前景 3
1.4 流体运动沿程损失的讨论 3
1.5 流体运动沿程阻力损失国内外研究的历史和现状 4
1.6 总结 5
1.7 本课题研究方法及目的 5
1.7.1 研究方法 5
1.7.2 本论文的主要目的 5
2 超细干粉沿程压力损失特性的理论分析 7
2.1超细干粉在管道内的流动 7
2.3 层流和湍流的特点 9
2.3.1层流特点 9
2.3.2湍流特点 9
2.4 沿程压力损失的计算 10
2.5 沿程阻力系数λ的计算 10
2.5.1沿程阻力系数λ的半经验公式 12
2.5.2沿程阻力系数λ的经验公式 12
3 沿程压力损失的实验研究 14