| 摘要: |
| 空调器室外换热器大多采用的波纹翅片管，会因使用过程中表面积灰而导致性能下降。本文的目的是通过实验来研究波纹翅片管换热器表面的粉尘沉积特性。搭建了积灰可视化实验台来观测粉尘的分布特征并测定沉积量，其中测试样件的翅片间距范围为1.6~3.2 mm，喷粉浓度范围为80~280 kg/m3，风速范围为1~3 m/s，喷粉时间为15~90 s。研究表明，粉尘主要沉积在换热器迎风面的翅片前缘处以及换热管的迎风面上；翅片间距小时易于粉尘沉积，翅片间距为1.6 mm样件上的单位面积粉尘沉积量较3.2 mm样件最多增加了52%；提高喷粉浓度会增加粉尘沉积，喷粉浓度为280 kg/m3下的单位面积粉尘沉积量较80 kg/m3最多增加了88.2%；高风速能够抑制粉尘沉积，风速为3 m/s下的单位面积粉尘沉积量较1 m/s最多下降了6.3%。 |
| 关键词: 翅片管式换热器 粉尘沉积 波纹翅片 实验研究 |
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| Experimental Study of Particle Deposition Characteristics on Wavy Finned-tube Heat Exchanger |
| Zhan Feilong,Tang Jiajun,Ding Guoliang,Zhuang Dawei |
| (Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University) |
| Abstract: |
| Wavy finned-tube heat exchangers are widely used in outdoor units of air conditioners, and their performance will be decreased when covered by dust particles. The purpose of this paper is to investigate the characteristics of particle deposition on wavy-finned tube heat exchangers. The particle distribution has been observed and the mass of depositing particle has been measured. The range of fin pitch is from 1.6mm to 3.2 mm, the particle concentration is from 80 kg/m3 to 280 kg/m3, the air velocity is from 1 m/s to 3 m/s, and the particle injection time is from 15 s to 90 s. The results show that particles mostly deposit on the leading edge of fins and windward side of tubes. The mass of depositing particle per unit of area increases up to 52% as fin pitch decreases from 3.2 mm to 1.6 mm, meaning that small fin pitch is beneficial to particle deposition. The mass of depositing particle per unit of area increases up to 88.2% with increasing particle injection concentration from 80 kg/m3 to 280 kg/m3, indicating that high particle injection concentration is helpful to particle deposition. The mass of depositing particle per unit of area decreases up to 6.3% as air velocity increases from 1m/s to 3 m/s, revealing that high air speed can restrain particle deposition. |
| Key words: finned-tube heat exchanger particle deposition wavy fin experimental investigation |
