Progress of quantitative evaluation of wetness losses in steam turbine

HAN Zhonghe; HAN Xu; LI Peng

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Progress of quantitative evaluation of wetness losses in steam turbine

更新时间：2025-09-28

- Progress of quantitative evaluation of wetness losses in steam turbine
- Thermal Power Generation Vol. 45, Issue 2, Pages: 1-6(2016)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK261
- Published：2016
- 稿件说明：
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HAN Zhonghe, HAN Xu, LI Peng. Progress of quantitative evaluation of wetness losses in steam turbine[J]. Thermal power generation, 2016, 45(2): 1-6.
DOI：

HAN Zhonghe, HAN Xu, LI Peng. Progress of quantitative evaluation of wetness losses in steam turbine[J]. Thermal power generation, 2016, 45(2): 1-6. DOI：

摘要

汽轮机内汽液两相非平衡凝结、两相间的速度差异、叶片表面形成水膜等均会引起湿汽损失

从而导致机组效率下降和叶片水蚀损坏。对此

本文通过分析比较国内外湿汽损失评估的研究进展

总结了现有的研究方法和目前存在的问题

讨论了湿汽损失系数的影响因素

并对其进行修正。结果表明:湿汽损失可分为热力学损失、水滴阻力损失、制动损失、疏水损失、离心损失和汽轮机出口损失

热力学损失占湿汽损失的80%以上

水滴阻力损失和制动损失所占比例较小;机组类型、盐分含量、运行工况等因素均会对湿汽损失系数产生影响。湿汽损失定量评估为汽轮机通流部分的设计和改造提供了理论参考。

Abstract

The wet steam two phase non-equilibrium condensation flows in turbine results in blade erosion and losses in efficiency.Non-equilibrium condensation

speed difference in two phases and water film on blade surface can cause wetness losses.The progress of the wetness losses was reviewed.The existing research methods and present problems were concluded.The basic wetness losses has been carried out including the thermodynamic loss

drag loss

impact loss

collected water loss

centrifuging loss and exit loss.The thermodynamic loss in the LP cylinder accounts for 80% of the wetness losses.The drag loss and the impact loss have small proportions in the total losses.The influence factors of wetness losses were studied.In addition

this paper introduced the method of numerical studies of two-phase flow condensation

droplets distribution

wetness losses calculation method

and so on.Quantitative evaluation of wetness losses provides a theoretical reference for flow passage design and modification.

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