Impact of acoustic wave propagation characteristics on aerodynamic damping of rotor blades in a transonic axial compressor  

作　　者：Yongbo YU Yanrong WANG Le HAN 

机构地区：[1]School of Energy and Power Engineering,Beihang University,Beijing 100191,China [2]Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China [3]Research Institute of Aero-Engine,Beihang University,Beijing 100191,China

出　　处：《Chinese Journal of Aeronautics》2024年第11期168-187,共20页中国航空学报（英文版）

基　　金：co-supported by the National Natural Science Foundation of China(No.52306034);the National Science and Technology Major Project,China(No.J2022-IV-00100024);the Fundamental Research Funds for the Central Universities,China and the National Science and Technology Major Project,China(No.J2017-IV-0002-0039)。

摘　　要：The aeroelastic stability associated with the acoustic wave propagation characteristics of transonic rotor blades was numerically investigated in this study.The influence of the vibration frequency on the aerodynamic damping of the first bending mode was primarily considered at different speeds,including both work and stall points.We found that the state of acoustic wave propagation associated with aeroelastic instability is closely related to rotational speed.At low speeds near stall points,the risk of aeroelastic instability is confined to the upstream cut-off state.However,at high speeds near stall points,aeroelastic instability may occur in both the downstream cut-off state and the acoustic wave propagation state of the upstream cut-off frequency,further expanding the range of the acoustic wave propagation state in which aeroelastic instability can arise.The research findings show that for suction surfaces,aerodynamic work is affected not only by acoustic wave propagation characteristics,but also by shock waves,radial flow,and reflux in the flow field.However,for pressure surfaces,the acoustic wave propagation characteristics play a significant role.When aeroelastic instability occurs,negative damping predominantly arises from the pressure surface.To investigate why lower-order modes are more prone to aeroelastic instability,specific simulations were conducted for the first bending and twisting modes under different operating conditions in the downstream cut-on state.When the vibration frequency significantly exceeds the downstream cutoff frequency,the blade phase is minimally influenced by acoustic wave propagation characteristics,and the rotor is aeroelastically stable in these phases.Simultaneously,there is an approximately linear increase in the unsteady pressure amplitude with increasing vibration frequency,and the aerodynamic work is predominantly influenced by the unsteady pressure amplitude.

关 键 词：Aeroelastic stability Nodal diameter Aerodynamic damping Acoustic wave propagation characteristic Vibration frequency 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]