半球形涡流发生器CaCO_3污垢沉积特性实验研究  

ExperimentalStudy of the Deposition Characteristics of CaCO_3 Foul on a Hemi-spheric Vortex Generator

作　　者：徐志明[1] 王瑞霞[1] 张一龙[2] 朱新龙[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热能动力工程》2014年第2期190-195,220-221,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51076025)

摘　　要：实验研究了矩形通道内半球形涡流发生器CaCO3污垢的沉积特性。采用直接称重法,通过改变球凸的截面直径(D=5、6和7 mm)和排列间距(S=10、15和20 mm)这两种结构参数,得出试片单位面积的结垢量,计算出抑垢率,从而分别绘制出随时间变化试片单位面积增重量和抑垢率的变化规律曲线。结果表明:与平板相比,带有球窝/球凸的试片单位面积增重量及污垢生长渐近值明显减小;当单一考察排列间距对结垢量的影响时,排列间距15 mm为实验范围内的最优布置间距,此间距下其试片单位面积结垢量最少,抑垢效果最佳;若只改变截面直径时,随着球凸截面直径的增大,试片单位面积结垢量呈现出先减小后增大的趋势,在实验范围内球凸直径为6 mm时其抑垢效果最好。Experimentally studied were the deposition characteristics of CaCO3foul in the rectangular channel of a hemispheric vortex generator. The method for directly weighing foul was used and through changing these two structural parame-ters such as the diameter in the cross section of the spherical boss( D = 5 mm,6mm and 7 mm) and arrangement spacing( S = 10 mm,15 mm and 20 mm),the fouling quantity in a unit area of the test piece can be obtained,thus the anti-fouling rate can be calculated and then curves showing the variation law governing the weight added in a unit area and anti-fouling rate of the test piece with time can be plotted respectively. The research results show that as compared with those of a flat plate,the weight added in a unit area of the test piece with spherical dents /bosses and its foul growth asymptotic value will obviously go down. When the influence of the arrangement spacing on the foul weight is being observed separately,the arrangement spacing of 15 mm is deemed as the optimum arrangement spacing in the range of the test,at which the foul weight in a unit area of the test piece is minimum,thus attaining an optimum anti-fouling effectiveness. If the diameter in the section of the spherical boss changes,the foul weight in a unit area of the test piece will assume a tendency of first decrease and then increase with an increase of the diameter above mentioned. In the range of the test,the anti-fouling effectiveness is considered as the best when the diameter of the spherical boss is 6 mm. As a result,the spherical vortex generator with a combined structure of spherical dents /bosses can be regarded as an effective element for resisting and prohibiting the foul and has a good prospect for applications.

关 键 词：球窝 球凸 析晶污垢 直接称重 抑垢率 

分 类 号：TK172[动力工程及工程热物理—热能工程]