汽轮机排汽通道内导流元件对其性能影响的数值研究  

Numerical Study on the Performance of Exhaust Steam Passage with Different Guide Baffles

作　　者：周兰欣[1] 陈顺宝[1] 邵明巍 魏春枝[3] 王统彬[3] 

机构地区：[1]华北电力大学电站设备状态检测与控制教育部重点实验室,保定071003 [2]内蒙古通辽发电总厂,通辽028011 [3]保定电力职业技术学院,保定071000

出　　处：《汽轮机技术》2015年第1期33-36,60,共5页Turbine Technology

摘　　要：考虑到单独模拟与排汽通道耦合模拟结果的差异性,利用数值计算软件模拟汽轮机排汽缸和凝汽器喉部耦合流动,得到更加精确的通道流场,在此基础上通过添加导流板优化排汽通道性能。计算结果表明,无论排汽通道进口汽流是直流还是旋流,在排汽通道上游(排汽缸缸顶)、中游(排汽缸出口)、下游(喉部)适当加装导流板均能有效改善通道内流场,但直流进汽时的改造效果更加明显,同时,越靠近上游,汽阻优化效果越明显,而在下游添加挡板则更有利于提高出口流场的均匀度。Considering the difference between the results of single simulation and exhaust passage simulation , use the numerical count software to simulate flow field of model coupled with exhaust hood and condenser throat , and get more accurate flow field,on this basis,optimize the performance of exhaust steam passage by adding guiding plates .The results show that,regardless of the exhaust passage inlet steam flow is straight flow condition or swirling flow condition ,equipped with appropriate guide baffles in the upstream（top of exhaust hood）,midstream（outlet of exhaust hood） and downstream （throat） of exhaust passage can effectively improve the flow field ,but the effect is more obvious under the straight flow condition,and the closer to the upstream,the vapour locking optimization effect is more obvious ,while downstream with baffle is more conducive to improve the uniformity of the outlet flow field .

关 键 词：排汽缸 凝汽器喉部 排汽通道 耦合流动 导流元件 数值研究 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]