Measurement of unsteady force on rotor blade surfaces in axial flow compressor  

作　　者：Jingyuan LIU Jichao LI Feng PENG Yang LIU Hongwu ZHANG 

机构地区：[1]Advanced Gas Turbine Laboratory,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Aeronautics and Astronautics,University of Chinese Academy of Sciences,Beijing 100049,China [3]National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine,Beijing 100190,China [4]Key Laboratory of Advanced Energy and Power,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [5]Innovation Academy for Light-duty Gas-turbine,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Journal of Aeronautics》2025年第2期31-45,共15页中国航空学报(英文版)

基　　金：funded by the National Natural Science Foundation of China(Nos.U24A20138 and No.52376039);the Beijing Natural Science Foundation,China(JQ24017);the National Science and Technology Major Project of China(Nos.J2019-II-0005-0025 and Y2022-II-0002-0005);the Special Fund for the Member of Youth Innovation Promotion Association of Chinese Academy of Sciences,China(No.2018173).

摘　　要：To assess the aerodynamic performance and vibration characteristics of rotor blades during rotation,a study of unsteady blade surface forces is conducted in a low-speed axial flow compressor under a rotating coordinate system.The capture,modulation,and acquisition of unsteady blade surface forces are achieved by using pressure sensors and strain gauges attached to the rotor blades,in conjunction with a wireless telemetry system.Based on the measurement reliability verification,this approach allows for the determination of the static pressure distribution on rotor blade surfaces,enabling the quantitative description of loadability at different spanwise positions along the blade chord.Effects caused by the factors such as Tip Leakage Flow(TLF)and flow separation can be perceived and reflected in the trends of static pressure on the blade surfaces.Simultaneously,the dynamic characteristics of unsteady pressure and stress on the blade surfaces are analyzed.The results indicate that only the pressure signals measured at the mid-chord of the blade tip can distinctly detect the unsteady frequency of TLF due to the oscillation of the low-pressure spot on the pressure surface.Subsequently,with the help of one-dimensional continuous wavelet analysis method,it can be inferred that as the compressor enters stall,the sensors are capable of capturing stall cell frequency under a rotating coordinate system.Furthermore,the stress at the blade root is higher than that at the blade tip,and the frequency band of the vibration can also be measured by the pressure sensors fixed on the casing wall in a stationary frame.While the compressor stalls,the stress at the blade root can be higher,which can provide valuable guidance for monitoring the lifecycle of compressor blades.

关 键 词：Axial flow compressor Unsteady blade surface force Wireless telemetry Tip leakage flow Vibration characteristic Unsteady flow 

分 类 号：TH4[机械工程—机械制造及自动化]