扩压管出口条件对低压排汽缸性能的影响  

Influence on Exhaust Hood by Conditions of Steam Turbine Diffuser Outlet

作　　者：周玉[1] 薛进 杨新健[1] 

机构地区：[1]华北电力大学,保定071003 [2]中国电能成套设备有限公司(烟台),烟台265100

出　　处：《汽轮机技术》2013年第6期405-407,433,共4页Turbine Technology

摘　　要：低压排汽缸内的扩压管对汽流具有扩压和改变方向的作用,对其出口处的结构进行优化能改善排汽缸整体的气动性能。扩压管出口处内导流环的倾角会影响汽流排出扩压管时的流动状况,不合适的倾角使得汽流在流出扩压管时形成较大的漩涡。对扩压管出口宽度和出口处内导流环倾角进行研究,计算结果显示,出口宽度和倾角都有一个最优值,分别为1 250mm和75°。Diffuser in the exhaust hood can expand the flow and change its direction,and optimization on the diffuser outlet may improve the performance of exhaust hood. The angle of inner wall of the diffuser outlet can influence the flow field near the outlet, so that the improper angle causes fluid vortex near the outlet. This passage makes a research on the width of outlet and angle of inner wall of diffuser outlet. The result shows that there is an optimization of width or angle, namely 1 250mm or 75 degrees.

关 键 词：低压排汽缸i扩压管 排汽损失 漩涡 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]