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Journal of Thermal Science

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2024 , Vol. 33 >Issue 2: 602 - 610

DOI: https://doi.org/10.1007/s11630-024-1936-x

Experimental and Numerical Investigation of Non-synchronous Blade Vibration Excitation in a Transonic Axial Compressor

  • WANG Songbai ,
  • WU Yadong ,
  • CHEN Yong ,
  • CAO Zhipeng
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  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. AECC Sichuan Gas Turbine Establishment, Chengdu 610500, China

网络出版日期: 2024-03-07

基金资助

This investigation was supported by the National Science and Technology Major Project (J2022-IV- 0010-0024) and Sichuan Science and Technology Planning Project (2021YFG0182).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Experimental and Numerical Investigation of Non-synchronous Blade Vibration Excitation in a Transonic Axial Compressor

  • WANG Songbai ,
  • WU Yadong ,
  • CHEN Yong ,
  • CAO Zhipeng
Expand
  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. AECC Sichuan Gas Turbine Establishment, Chengdu 610500, China

Online published: 2024-03-07

Supported by

This investigation was supported by the National Science and Technology Major Project (J2022-IV- 0010-0024) and Sichuan Science and Technology Planning Project (2021YFG0182).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

旋转不稳定是一种复杂的流动现象，随压气机气动负荷的不断提高，其诱发的叶片非同步振动问题已成为压气机设计面临的重要挑战。本研究旨在了解跨声速轴流压气机转子旋转不稳定引发的叶片非同步振动现象。实验中，叶片的非同步振动和气流激励通过应变片和壁面机匣压力脉动传感器获取，使用全环非定常数值模拟揭示了压气机内非同步气流激励的产生机制。结果表明：第一级转子叶片呈现一阶弯曲模态下的非同步振动，非同步振动的发生伴随着压力脉动的急剧增加，其幅值可达20%水平。当叶片处于大幅值振动时，非定常气流激励频率将锁定至叶片结构的固有频率，数值预测的非同步气流激励频率与实验结果吻合较好。周向不稳定流动气流扰动的主要模态数约为叶片数的47%，其周向尺度占据2～3栅距，叶尖泄漏流和吸力面分离涡相互作用使得叶尖不稳定涡在流向发生振荡，是引起叶片非同步振动的主要原因。

关键词： non-synchronous vibration; transonic axial compressor; rotor blade; rotating instabilities; unsteady flow

本文引用格式

WANG Songbai , WU Yadong , CHEN Yong , CAO Zhipeng . Experimental and Numerical Investigation of Non-synchronous Blade Vibration Excitation in a Transonic Axial Compressor[J]. 热科学学报, 2024 , 33(2) : 602 -610 . DOI: 10.1007/s11630-024-1936-x

Abstract

The complex flow phenomenon of rotating instability (RI) and its induced non-synchronous vibration (NSV) have become a significant challenge as they continuously increase aerodynamic load. This study aims to provide an understanding of the non-synchronous blade vibration phenomenon caused by the rotating instability of a transonic axial compressor rotor. In this case, blade vibrations and non-synchronous excitation are captured by strain gauges and unsteady wall pressure transducer sensors. Unsteady numerical simulations for a full-annulus configuration are used to obtain the non-synchronous flow excitation. The results show that the first-stage rotor blade exhibits an NSV close to the first bending mode; NSV is accompanied by a sharp increase in pressure pulsation; amplitude can reach 20%, and unsteady aerodynamic frequency will lock in a structural mode frequency when the blade vibrates in a large-amplitude motion. The predicted NSV frequency aligns well with the experimental results. The dominant mode of circumferential instability flow structure is approximately 47% of the number blades, and the cell size occupies 2–3 pitches in the circumferential direction. The full-annulus unsteady simulations demonstrate that the streamwise oscillation of the shedding and reattachment vortex structure is the main cause of NSV owing to the strong interaction between the tip leakage and separation vortices near the suction surface.

Key words： non-synchronous vibration; transonic axial compressor; rotor blade; rotating instabilities; unsteady flow

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