图像法用于气-固两相流化床中气泡行为的研究  

STUDY ON GAS BUBBLES' BEHAVIOR IN GAS-SOLID TWO-PHASE FLUIDIZED BED BY USING IMAGE METHOD

作　　者：罗娅[1] 马增益[1] 严建华[1] 朱建新[1] 林彬[1] 王飞[1] 岑可法[1] 

机构地区：[1]浙江大学,浙江杭州310027

出　　处：《热力发电》2005年第1期16-19,共4页Thermal Power Generation

基　　金：国家自然科学基金资助项目 (N50 1 0 60 1 5) ;国家重点基础研究专项经费资助项目 (1 2 0 0 1CBA0 960 0 )

摘　　要：利用高速CCD拍摄气固两相流化床中气泡的运动行为 ,通过对气泡边界的识别得到了气泡中心坐标 ,并计算了气泡面积和上升速度。试验发现 ,气泡在床层上升过程中长大 ,上升速度变快 ;气泡的上升速度和产生频率随着气体流量的增加而增大 ;如果流化风速较高 ,流化床中容易产生 2个或 2个以上的气泡 。The picture for moving behavior of gas bubbles in gassolid twophase fluidized bed had been taken by using high speed CCD, the coordinate of gas bubble's centre being obtained through recognition of the gas bubble's margin, the area and rising speed of the gas bubble being calculated. It was found from tests that the gas bubbles' growup in rising course of the bed layer, and their rising speed became fast; the rising speed and generation frequency of gas bubbles increase along with the increament of gas flow; if the fluidized air velocity was higher, two or more gas bubbles may easily generated in the fluidized bed, and the phenomenon of gathering together for gas bubbles may occure.

关 键 词：图像法 气一固两相 流化床 气泡 上升速度 

分 类 号：TK224.11[动力工程及工程热物理—动力机械及工程]