Research on suppression method for circumferential flow and fluid-induced vibration of blade tip seal

ZHANG Yao, ZHANG Wanfu, GU Qianlei, CHEN Luqi, MA Kai, LI Chun

Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 228-233.

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PDF(1966 KB)
Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 228-233.

Research on suppression method for circumferential flow and fluid-induced vibration of blade tip seal

  • ZHANG Yao, ZHANG Wanfu, GU Qianlei, CHEN Luqi, MA Kai, LI Chun
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Abstract

The main method to reduce fluid-induced vibration is to control the inlet preswirl and circumferential flow of tip clearance.This paper established three-dimensional computational fluid dynamics (CFD) models of a steam turbine control stage, to study the effect of a new structure on circumferential flow and fluid-induced vibration, by adding the micro cascades on the shroud and cylinder inlet of tip clearance.Calculated results show that under the action of micro cascades, the fluid preswirl at sealing inlet changes from positive to negative, and the effective damping coefficient changes from negative to positive.It was proved that the fluid-induced vibration is effectively suppressed and the rotor stability is improved.It has better suppression effect of fluid-induced vibration when the micro cascades mounted on the shroud rather than on the cylinder.The rotor system has the best stability when there are 10 micro cascades on the shroud and 6 micro cascades on the cylinder between two rotor blades.

Key words

tip seal / fluid-induced vibration / micro cascades / inlet preswirl

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ZHANG Yao, ZHANG Wanfu, GU Qianlei, CHEN Luqi, MA Kai, LI Chun. Research on suppression method for circumferential flow and fluid-induced vibration of blade tip seal[J]. Journal of Vibration and Shock, 2020, 39(10): 228-233

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