Rotordynamic characteristics of rotating labyrinth gas turbine seal with centrifugal growth

被引：46

作者：

Subramanian, Sivakumar ^{[1
,2
]}

Sekhar, A. S. ^{[1
]}

Prasad, B. V. S. S. S. ^{[1
,3
]}

机构：

[1] Indian Inst Technol, Dept Mech Engn, Madras 600036, Tamil Nadu, India

[2] Indian Inst Technol, Dept Mech Engn, Machine Design Sect, Madras 600036, Tamil Nadu, India

[3] Indian Inst Technol, Dept Mech Engn, Thermal Turbomachines Lab, Madras 600036, Tamil Nadu, India

来源：

TRIBOLOGY INTERNATIONAL | 2016年 / 97卷

关键词：

Labyrinth seal; Gas turbine; Deformation/centrifugal growth; Numerical analysis; DYNAMIC CHARACTERISTICS; ANNULAR SEAL; LEAKAGE; COEFFICIENTS; STATOR;

D O I：

10.1016/j.triboint.2016.01.003

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The rotordynamic characteristics of gas turbine seals have been investigated in numerous previous studies. However, the effects of centrifugal growth were often ignored; and no extensive studies have been reported. To this end, the present work examines numerically the influence of centrifugal growth on the rotordynamic characteristics of a typical rotating labyrinth gas turbine seal. A computational framework developed based on combined 3D FE/CFD methodology along with an appropriate rotordynamic model has been employed. For a given seal clearance and eccentricity, various flow and operating conditions are investigated covering a range of pressure ratios and rotational speeds. A substantial variation in both the cross-coupled stiffness and direct damping is noticed and the influence increases with rotational speed. The stability characteristics reveal that centrifugal growth of the seal has a detrimental effect at relatively low pressure ratio and high rotational speed combinations. The computational approach is validated against a typical labyrinth seal results reported in the literature. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：349 / 359

页数：11

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