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Rubbing features of the bladed drum rotor under a novel coupled axial-radial thermal effect

轴径向耦合热效应下带叶鼓筒转子系统碰摩动力学特性

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Abstract

High temperatures in a gas turbine may lead to severe blade rubbing failure for the bladed thin drum rotor. It is essential to demonstrate such rubbing features. This paper established a bladed drum rotor model with blade rubbing induced by high temperatures. The analytical function of a coupled axial-radial temperature in the drum according to the actual thermal field analysis is obtained. The equations of motion for this rotor are derived. The dynamic model and its solution method are verified through the natural frequency comparison and the rub-impact response analysis. Thereafter numerical simulations are carried out. Results show that the heat at the turbine is transferred from its outer surface to its inner surface, then to the compressor’s inner surface along the axial direction, and finally from the compressor’s inner surface to its outer surface. This is a novel coupled axial-radial thermal effect for the gas turbine, which causes special axial and radial thermal gradients. The effect is induced by high temperatures in a gas turbine and intensifies a blade rubbing fault. Increasing the exhaust temperature aggravates the coupled axial-radial thermal effect, which causes more severe blade rubbing. Fortunately, introducing a lower temperature on the drum’s inner surface can prevent blade rubbing caused by this thermal effect.

摘要

燃气轮机高温载荷使带叶薄壁鼓筒转子发生严重的碰摩故障, 阐明其动力学特性对避免此类故障具有重要意义. 本文建立了高温热载荷下带叶薄壁鼓筒转子热弹耦合动力学模型. 根据实际的热场分析结果, 获得了鼓筒内轴径向耦合温度解析函数, 并推导出此转子系统的运动微分方程. 通过固有频率对比和碰摩响应分析, 验证了动力学模型及其求解方法的准确性. 本文重点开展了高温热载荷下带叶鼓筒转子系统碰摩动力学特性分析, 揭示出燃气轮机的轴径向耦合热效应: 高温热载荷从涡轮处鼓筒外表面向内表面传递, 再沿鼓筒轴向传递至压缩机内表面, 最后从压缩机内表面传递至其外表面. 此现象是由燃气轮机中特殊的高温载荷引起, 诱发轴向和径向耦合热梯度, 可致使叶片发生碰摩故障. 燃气轮机排气温度的升高将加剧轴径向耦合热效应, 导致更严重的叶片碰摩现象, 但在鼓筒内表面引入低温边界条件可以削弱这种热效应的不良影响.

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Acknowledgements

The work was supported by the National Natural Science Foundation of China (Grant No. 52005434), the China Scholarship Council (Grant No. 202008320145), the China Postdoctoral Science Foundation (Grant No. 2023M733151), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20190912).

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Authors and Affiliations

  1. School of Mechanical Engineering, Yangzhou University, Yangzhou, 225127, China

    Haijiang Kou  (寇海江), Yaowen Zhang  (张耀文), Yuxiang Shi  (史宇翔), Jiaojiao Du  (杜娇娇), Zhida Zhu  (竺志大), Fan Zhang  (张帆) & Li Zeng  (曾励)

  2. Department of Mechanical Engineering, National University of Singapore, Singapore, 117576, Singapore

    Haijiang Kou  (寇海江) & Heow Pueh Lee

Authors
  1. Haijiang Kou  (寇海江)
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  2. Yaowen Zhang  (张耀文)
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  3. Heow Pueh Lee
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  4. Yuxiang Shi  (史宇翔)
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  5. Jiaojiao Du  (杜娇娇)
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  6. Zhida Zhu  (竺志大)
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  7. Fan Zhang  (张帆)
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  8. Li Zeng  (曾励)
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Contributions

Author contributions Haijiang Kou contributed to conceptualization, formal analysis, funding acquisition, methodology, supervision, writing original draft, and writing review & editing. Yaowen Zhang contributed to formal analysis, methodology, validation, visualization, and writing original draft. Heow Pueh Lee supervised the research. Yuxiang Shi contributed to formal analysis. Jiaojiao Du organized the manuscript and carried out validation. Zhida Zhu, Fan Zhang, and Li Zeng provided resources.

Corresponding authors

Correspondence to Haijiang Kou  (寇海江) or Jiaojiao Du  (杜娇娇).

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Conflict of interest On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Kou, H., Zhang, Y., Lee, H.P. et al. Rubbing features of the bladed drum rotor under a novel coupled axial-radial thermal effect. Acta Mech. Sin. 40, 523034 (2024). https://doi.org/10.1007/s10409-023-23034-x

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