中文摘要：

翅片管换热器表面沉积的粉尘会导致换热器压降增加。本文搭建了换热器积灰可视化实验台,选取开缝翅片管换热器为测试样件,在风速范围为1.0～2.3 m/s,喷粉浓度范围为2.1～10.8 g/m^3的条件下进行实验,研究了换热器表面的粉尘沉积特性及空气侧压降变化。结果表明：粉尘主要沉积在翅片迎风面的前缘开缝处以及换热管的迎风面上;高风速有利于粉尘沉积并增大积灰前后压降增幅,在风速变化范围内,粉尘沉积量最多增加98.4%,积灰前后压降增幅最多增加93.8%;提高喷粉浓度有利于粉尘沉积并增大积灰前后的压降增幅;在喷粉浓度变化范围内,粉尘沉积量最多增加22.8%,积灰前后压降增幅最多增加28.6%;在积灰过程中,空气侧压降比粉尘沉积量更快达到稳定状态。

英文摘要：

The air-side pressure drop of fin-and-tube heat exchangers will increase when covered with dust particles. In this paper, a vis- ual experimental rig was set up to investigate the panicle deposition and pressure drop characteristics. The slit fin-and-tube heat exchang- ers were selected as the test samples. The air velocity ranged from 1.0 to 2.3 m/s and the particle concentration ranged from 2.1 to 10. 8 g/m^3. The results indicate that dust particles mostly deposited on the windward side of slit fins and the front part of tubes. High air velocity is beneficial to the particle deposition and can increase the air-side pressure drop ; the maximum particle deposition weight and the maximum increase of air-side pressure drop increased up to 98.4% and 93.8% respectively in the experimental conditions. High panicle con- centration can promote the particle deposition and increase the air-side pressure drop; the maximum particle deposition weight and the maximum increase of air-side pressure drop increased up t9 22.8% and 28.6% respectively in the experimental conditions. The air-side pressure drop tended to stability more quickly than particle deposition weight in the particle deposition process.