关于汽轮机内湿蒸汽两相凝结流动的研究进展

发布时间：2018-01-27 06:30

本文关键词： 湿蒸汽两相流自发凝结透平　出处：《热能动力工程》2016年05期 　论文类型：期刊论文

【摘要】：汽轮机内的湿蒸汽非平衡凝结流动会导致机组效率降低和叶片水蚀损坏。由于两相流动远比单相流动复杂,通过实验难以测量其凝结特性。对此,通过分析国内外湿蒸汽两相流理论和实验研究现状,总结了现有的3种研究方法,并指出研究中存在的问题,讨论了两相流凝结机理及其求解方法,阐述了几种湿蒸汽测量方法优点及不足之处。分析指出:凝结相变过程十分复杂,传热传质在微米级水平发生,因此,有必要发展一种考虑两相间耦合的凝结模型。结合两相流数值研究的现状,对汽轮机两相流数值的求解方法进行阐述。湿蒸汽两相流研究为汽轮机通流部分设计和改造提供了理论参考。
[Abstract]:The non-equilibrium condensation flow of wet steam in steam turbine will lead to the reduction of unit efficiency and water erosion damage of blade. Because the two-phase flow is much more complicated than single-phase flow, it is difficult to measure its condensation characteristics through experiments. Based on the analysis of the theoretical and experimental research status of wet steam two-phase flow at home and abroad, three existing research methods are summarized, and the existing problems are pointed out, and the condensation mechanism of two-phase flow and its solution are discussed. The advantages and disadvantages of several wet steam measurement methods are described. It is pointed out that the condensation phase transition process is very complex and the heat and mass transfer occurs at the micron level. It is necessary to develop a condensation model considering the coupling between two phases. The method of solving the numerical value of steam turbine two-phase flow is expounded. The study of wet steam two-phase flow provides a theoretical reference for the design and reconstruction of turbine flow passage.
【作者单位】：华北电力大学电站设备状态监测与控制教育部重点实验室;
【基金】：国家自然科学基金资助项目(51576066) 中央高校基本科研业务费专项资金资助项目(2015MS107)
【分类号】：TK261
【正文快照】： 引言汽轮机通流部分在长期水蚀作用下,出现流动效率降低,机组经济性变差等问题。叶片长期工作在湿蒸汽工况下,还可能出现断裂,导致严重的事故[1]。1910年,Baumann提出:1%的湿度增加导致1%的效率下降[2]。目前,1 000 MW机组低压缸在THA(热耗率验收)工况下的效率可达93%左右,继

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