Numerical analysis on leakage flow of blade tip stepped seal in steam turbine

被引：1
|
作者：
Cao L.-H. [1 ]
Jia Y.-M. [1 ]
Li P. [1 ]
Hu P.-F. [1 ]
Li Y. [1 ]
机构：
[1] School of Energy and Power Engineering, Northeast Dianli University, Jilin, 132012, Jilin Province
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2016年 / 50卷 / 08期
关键词：
Blade tip seal; Entropy production; Leakage flow; Steam turbine; Three-dimensional streamlines;
D O I：
10.3785/j.issn.1008-973X.2016.08.017
中图分类号：
学科分类号：
摘要：
The three-dimensional steady numerical simulation was performed to study the influence of the tip clearances and the teeth number on the blade tip leakage flow rate, the three-dimensional streamlines in the seal and at the exit of rotor blade, and the distribution of entropy production at the exit of rotor blade, by taking the first high-pressure stage of a steam turbine with the blade tip stepped seal as object. Results indicate that the increase of tip clearance cause the increase of the leakage flow rate, the skewing of three-dimensional streamlines at the exit of rotor blade, the region of entropy production and the mixing loss. The increase of teeth number of tip stepped seal cause the decrease of the leakage flow rate, the skewing of three-dimensional streamlines at the exit of rotor blade, the entropy production and the mixing loss. The mixing loss caused by blade tip leakage flow is mainly on the 7% region of the top exit of rotor blade. © 2016, Zhejiang University Press. All right reserved.
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页码：1545 / 1550
页数：5
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