Optimization design of dehumidification structure of the last stage blade in a steam turbine

WANG Chun; XIE Danmei; LI Xibin; FAN Xiaoping; LIAO Xingbao; YU Xinggang

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Optimization design of dehumidification structure of the last stage blade in a steam turbine

更新时间：2025-09-28

- Optimization design of dehumidification structure of the last stage blade in a steam turbine
- Thermal Power Generation Vol. 44, Issue 8, Pages: 43-48(2015)
- 作者机构：
  
  1. 武汉大学动力与机械学院
  2. 东方汽轮机有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK263.3
- Published：2015
- 稿件说明：
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WANG Chun, XIE Danmei, LI Xibin, et al. Optimization design of dehumidification structure of the last stage blade in a steam turbine[J]. Thermal power generation, 2015, 44(8): 43-48.
DOI：

WANG Chun, XIE Danmei, LI Xibin, et al. Optimization design of dehumidification structure of the last stage blade in a steam turbine[J]. Thermal power generation, 2015, 44(8): 43-48. DOI：

摘要

以某1 000 MW机组汽轮机末级叶片为对象

采用CFX软件对该汽轮机末两级叶栅内凝结流动及水滴沉积过程进行了数值模拟

计算分析了除湿缝的缝隙位置、角度、宽度及数目对除湿效率、二次水滴去除率和级效率的影响。结果表明:为保证末级叶片同时具有较好的除湿性能、级效率和静叶刚度

除湿缝结构应设计在相对叶高60%以上

且在压力面和吸力面相对叶宽80.6%和29.2%处;除湿缝角度选取45°

除湿缝宽度采用1.0mm;若不考虑空心静叶的强度问题

单段除湿缝的综合性能更优;当开缝面积相同时

双缝除湿缝的各项性能均更优;当开缝宽度相同时

单缝除湿缝的综合性能更优。

Abstract

Taking the long last stage blades of steam turbine in a 1 000 MW unit as the research objects

the condensation flow and droplet deposition in the last two stages were numerically calculated by CFX software.Effects of such dehumidification structure design parameters as the slot position

slot angle

slot width and slot number on the humidification efficiency

second water droplet removal rate and stage efficiency were investigated in detail.The results show that

to ensure excellent performance for the last stage blades

like well humidification property

high stage efficiency and great stationary blade strength

the moisture removal suction slots should be located at the place higher than 60%of the relative blade high in radial direction

and in the axial position of 80.6% and 29.2% relative blade width on the pressure and suction surfaces respectively.In addition

the slot angle should be 45°and the width ought to be 1.0 mm.If not considering the hollow stationary blade's strength

the single-stage humidification slot had better comprehensive performance.With the same slot area

the double-slot humidification slot was better.When the slot width is the same

the single-slot humidification slot was better.

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