双列调节级变工况对汽流弯应力的影响  

Influences of different conditions to steam bending stress of curtis stage

作　　者：高怡秋[1] 周振东[1] 祝华[1] 

机构地区：[1]中国船舶重工集团公司第704研究所,上海200031

出　　处：《华北电力大学学报（自然科学版）》2012年第4期90-94,共5页Journal of North China Electric Power University：Natural Science Edition

摘　　要：汽轮机双列调节级的工作环境极为恶劣,其动叶的汽流弯应力计算是叶片强度振动的重要问题。在汽轮机变工况时,由于焓降、流量的改变,调节级动叶汽流弯应力将发生重大变化。研究了调节级背压、负荷以及蒸汽参数对汽流弯应力的影响。计算结果表明,调节级背压的减小会增大动叶的汽流弯应力,其中第二列动叶的增幅大于第一列;在第一组喷嘴即将达到临界流量时,动叶汽流弯应力最大;在初参数焓变化不大的情况下,汽流弯应力与蒸汽压力成正比关系。The work environment of the Curtis stage in turbine is extremely harsh, so the calculation of the steam bending stress is an important issue in research of blade vibration. In different condition, due to enthalpy drop, the flow changes, steam bending stress on the blade will change large. Investigate the influences of the baekpressure, load and steam parameters to the steam bending stress. The results indicate that the decrease of backpressure level will increase the bending stress on the blade, which move the bending stress increase greater on second blade than on the first. The steam bending stress achieves maximum when the steam flow in the first group of nozzles is about to reach the critical. In the case of little change in enthalpy of initial parameters, steam bending stress is proportional to the steam pressure.

关 键 词：调节级 汽流弯应力 变工况 焓降 调节阀 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]