空心静叶栅沉积水滴的去除方法和分析  

Removal Method of Depositional Droplet and Exergy Analysis in Hollow Cascade

作　　者：赵亚芳[1] 王玉璋[2] 刘永文[2] 孙弼[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]上海交通大学动力机械及工程国家教育部重点实验室,上海200030

出　　处：《动力工程》2004年第3期351-355,共5页Power Engineering

摘　　要：基于利用控制容积法求解Reynolds时均的N-S方程、k-ε模型和Lagrange方法等模型,分析了空心静叶栅内部的二维湿蒸汽汽液两相流场和不同粒径的水滴沉积规律、沉积位置,同时在沉积位置开2种宽度、3个方向和不同数量的缝隙分别分析了抽吸和吹除两种方法的去湿效果,并且根据计算的结果对各工况进行了效率分析。通过流场分析结果表明:开缝隙方向尽量要和当地的流速方向一致且缝隙宽度不能太大,这样缝隙内就较好的流场,且吹除方法可以有效地减少水滴的沉积,但通过效率分析抽吸方法比吹除方法效率高,从减少水滴沉积和能量损失两方面考虑,抽吸方法更好一些。Based on the time-averaged Reynolds N-S equations solved by using the control volume method, k-ε turbulent mode and Lagrange approach and so on, 2D wet steam two-phase flow and the movement rule and deposition position of droplets in hollow cascade are analyzed. When the apertures with different widths, different directions and different quantities are opened, the removal water performances of suction and blowing are investigated. The exergy efficiencies of all operating condition are calculated. The calculating results of the field in the cascade indicate the direction of aperture should be identical the direction of local flow and there is the better field in the smaller width of aperture. The blowing can effectively reduce the droplet deposition. The exergy efficiency of suction is higher than the blowing. The suction method is better than the blowing method from reducing the droplet deposition and energy loss. Figs 3, tables 3 and refs 6.

关 键 词：动力机械工程 汽轮机 空心静叶栅 水滴沉积 炯分析 两相流 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]