Vibration Characteristics Analysis of Integrally Shrouded Turbine Blade Considering Separation and Reattachment

Bingbing He, Xingmin Ren, Shangwen He, Weiyang Qin, Yingang Ma

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)308-314
Number of pages7
JournalXibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University
Volume36
Issue number2
DOIs
StatePublished - Apr 2018

Keywords

  • Bifurcation
  • Integrally shrouded blade
  • Nonlinear spring
  • Reattachment
  • Separation

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