汽轮机叶顶汽封泄漏涡对汽流激振力的影响

曹丽华,孟宾,李盼

振动与冲击 ›› 2020, Vol. 39 ›› Issue (16) : 283-288.

PDF(1826 KB)
PDF(1826 KB)
振动与冲击 ›› 2020, Vol. 39 ›› Issue (16) : 283-288.
论文

汽轮机叶顶汽封泄漏涡对汽流激振力的影响

  • 曹丽华,孟宾,李盼
作者信息 +

Effect of blade tip seal leakage vortex on steam flow excitation force of a steam turbine

  • CAO Lihua, MENG Bin, LI Pan
Author information +
文章历史 +

摘要

汽轮机叶顶间隙汽流激振力严重影响转子的稳定运行。采用SST k-ω模型,基于有限体积法对带有叶顶汽封的汽轮机高压缸第一压力级整周模型进行数值计算,着重分析了不同条件下叶顶汽封内泄漏涡的流动特性及其对汽流激振力的影响。结果表明:泄漏流在汽封出口腔室内部形成了腔室涡和回流涡,回流涡的旋转方向与腔室涡相反;随着间隙的变大,汽封内部腔室涡的涡线由完整的涡线变为扭曲的涡线;大间隙条件下,汽封内部腔室涡发生变化,上部小间隙处涡心向下游迁移、下部大间隙处涡心向上游迁移;涡心位置的变化使得叶顶围带受到的汽流激振力值增大76%,角度增大19.6%。

Abstract

Steam flow excitation force in blade tip clearance of a steam turbine seriously influences the stable operation of its rotor.The first full-cycle stage model of the steam turbine with blade tip seal was calculated by the SST k-ω model and the finite volume method to study flow characteristics of leakage vortices and steam flow excitation force in blade tip seal under different conditions.The cavity vortices and reflux vortices form in outlet cavity when the leakage flow passes through the blade tip seal.The reflux vortices and cavity vortices have an opposite rotation direction.The steamline near cavity inlet sharply curves with the increase of clearance.Under the condition of large clearance, the position of vortex core in cavity changes.The vortex core at the upper part of small clearance migrates downstream and the lower part of large clearance migrates upstream.Steam flow excitation force on blade tip should increases by 76% and the angle increases by 19.6% because of the variation of vortex core position.

关键词

汽轮机 / 叶顶汽封 / 泄漏流 / 涡心位置 / 激振力

Key words

steam turbine / blade tip seal / leakage flow / vortex core position / excitation force

引用本文

导出引用
曹丽华,孟宾,李盼. 汽轮机叶顶汽封泄漏涡对汽流激振力的影响[J]. 振动与冲击, 2020, 39(16): 283-288
CAO Lihua, MENG Bin, LI Pan. Effect of blade tip seal leakage vortex on steam flow excitation force of a steam turbine[J]. Journal of Vibration and Shock, 2020, 39(16): 283-288

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