Volume 36, Number 2, April 2018
|Page(s)||308 - 314|
|Published online||03 July 2018|
Vibration Characteristics Analysis of Integrally Shrouded Turbine Blade Considering Separation and Reattachment
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China
2 School of Mechanics & Engineering Science, Zhengzhou University, Zhengzhou 450001, China
The nonlinear forced vibration responses of integrally shrouded turbine blade considering different contact state are investigated in this paper. A lumped mass model of integrally shrouded turbine blade considering separation and reattachment of adjacent shrouds and centrifugal stiffening effects is established and its dynamic equation is deduced. Collision force is approximated by linear and cubic springs together which is more realistic, and friction force is approximated by an exponential-type velocity-dependent model. Numerical results indicate that integrally shrouded turbine blade displays very complex nonlinear phenomena and it can experience periodic 1, periodic 2, periodic 3, periodic 4 and chaotic vibration. Gap asymmetry leads to more complicated motions of the shrouded blade.
Key words: integrally shrouded blade / separation / reattachment / nonlinear spring / bifurcation
关键字 : 自带冠叶片 / 分离 / 重新接触 / 非线性弹簧 / 分岔
© 2018 Journal of Northwestern Polytechnical University. All rights reserved.
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