Abstract: For the purpose of studying the impact of vortex generator structure and arrangement on fouling of heat exchange surface,CaCO₃ crystallization fouling deposition was simulated and the inside of rectangular channel was decorated with wing type vortex generator.Under the condition of temperature 50 centigrade,velocity 0.2 m·s^-1 and CaCO₃ concentration about 1000 mg·L^-1,the influence of geometrical factors was calculated and analyzed,such as winglet type,attack angle and lengthways distance on surface fouling deposition.The results showed that,at the specific temperature and velocity,surface unit area fouling decreased with increasing angle of attack of the wing vortex generator,and increased with increasing arrangement distance of vortex generator.The fouling on the surface reached a maximum when the distance was 60 mm,and then declined beyond 60 mm.

Key words: winglet vortex generator, spacing and angle of attack, CaCO₃ crystallization fouling, numerical simulation

摘要： 为研究翼型涡流发生器结构以及布置对换热面污垢的影响,对矩形通道内布置翼型涡流发生器后壁面CaCO₃析晶污垢的沉积进行了模拟。计算并分析了在温度为50℃,流速为0.2 m·s^-1,浓度为1000 mg·L^-1的CaCO₃过饱和溶液下,翼形涡流发生器的翼型、攻角和纵向间距等几何因素对表面污垢沉积的影响。结果表明:表面单位面积结垢量随着翼型涡流发生器攻角的增大而减小,随着涡流发生器列间距的增大而增大,当间距为60 mm时达到最大,超过60 mm后表面单位面积结垢量呈现下降趋势。

关键词: 翼型涡流发生器, 间距和攻角, CaCO₃析晶污垢, 数值模拟