Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation

Axial compressor blades with a deformed initial torsion angle caused by aerodynamic excitation resonated at the working speed and changed the rule of fatigue damage accumulation. The fatigue life of a blade has a prediction error, even causing serious flight accidents if the effect of torque causing...

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Autores principales:	Xi Fu, Chao Ma, Jiewei Lin, Junhong Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	compressor blade aerodynamic excitation torsional moment vibration response nonlinear fatigue damage life prediction Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/fecdb33478ef45d9be744fbe7a94d7db
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spelling	oai:doaj.org-article:fecdb33478ef45d9be744fbe7a94d7db2021-11-25T18:22:18ZNumerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation10.3390/met111118352075-4701https://doaj.org/article/fecdb33478ef45d9be744fbe7a94d7db2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1835https://doaj.org/toc/2075-4701Axial compressor blades with a deformed initial torsion angle caused by aerodynamic excitation resonated at the working speed and changed the rule of fatigue damage accumulation. The fatigue life of a blade has a prediction error, even causing serious flight accidents if the effect of torque causing damage deterioration of the blade fatigue life is neglected. Therefore, in this paper, a uniaxial non-linear fatigue damage model was modified using the equivalent stress with torsional shear stress, and the proposed fatigue model including the torsional moment was used to study the compressor blade fatigue life. Then, the blade numerical simulation model was established to calculate the vibration characteristics under complex loads of airflow excitation and a rotating centrifugal force. Finally, the blade fatigue life under actual working conditions was predicted using the modified fatigue model. The results show that the interaction between centrifugal and aerodynamic loads affects the natural frequency, as the frequencies in modes dominated by bending deformation decreased whereas those dominated by torsional deformation increased. Furthermore, the blade root of the suction surface showed stress concentration, but there is an obvious difference of stress distribution and amplitude between the normal stress and the equivalent stress including torsional shear stress. The additional consideration of the torsional shear stress decreased the predicted fatigue life by 4.5%. The damage accumulation rate changes with the loading cycle, and it accelerates fast for the last 25% of the cycle, when the blade fracture may occur at any time. Thus, the aerodynamic excitation increased the safety factor of blade fatigue life prediction.Xi FuChao MaJiewei LinJunhong ZhangMDPI AGarticlecompressor bladeaerodynamic excitationtorsional momentvibration responsenonlinear fatigue damagelife predictionMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1835, p 1835 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	compressor blade aerodynamic excitation torsional moment vibration response nonlinear fatigue damage life prediction Mining engineering. Metallurgy TN1-997
spellingShingle	compressor blade aerodynamic excitation torsional moment vibration response nonlinear fatigue damage life prediction Mining engineering. Metallurgy TN1-997 Xi Fu Chao Ma Jiewei Lin Junhong Zhang Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation
description	Axial compressor blades with a deformed initial torsion angle caused by aerodynamic excitation resonated at the working speed and changed the rule of fatigue damage accumulation. The fatigue life of a blade has a prediction error, even causing serious flight accidents if the effect of torque causing damage deterioration of the blade fatigue life is neglected. Therefore, in this paper, a uniaxial non-linear fatigue damage model was modified using the equivalent stress with torsional shear stress, and the proposed fatigue model including the torsional moment was used to study the compressor blade fatigue life. Then, the blade numerical simulation model was established to calculate the vibration characteristics under complex loads of airflow excitation and a rotating centrifugal force. Finally, the blade fatigue life under actual working conditions was predicted using the modified fatigue model. The results show that the interaction between centrifugal and aerodynamic loads affects the natural frequency, as the frequencies in modes dominated by bending deformation decreased whereas those dominated by torsional deformation increased. Furthermore, the blade root of the suction surface showed stress concentration, but there is an obvious difference of stress distribution and amplitude between the normal stress and the equivalent stress including torsional shear stress. The additional consideration of the torsional shear stress decreased the predicted fatigue life by 4.5%. The damage accumulation rate changes with the loading cycle, and it accelerates fast for the last 25% of the cycle, when the blade fracture may occur at any time. Thus, the aerodynamic excitation increased the safety factor of blade fatigue life prediction.
format	article
author	Xi Fu Chao Ma Jiewei Lin Junhong Zhang
author_facet	Xi Fu Chao Ma Jiewei Lin Junhong Zhang
author_sort	Xi Fu
title	Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation
title_short	Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation
title_full	Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation
title_fullStr	Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation
title_full_unstemmed	Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation
title_sort	numerical study on vibration response and fatigue damage of axial compressor blade considering aerodynamic excitation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/fecdb33478ef45d9be744fbe7a94d7db
work_keys_str_mv	AT xifu numericalstudyonvibrationresponseandfatiguedamageofaxialcompressorbladeconsideringaerodynamicexcitation AT chaoma numericalstudyonvibrationresponseandfatiguedamageofaxialcompressorbladeconsideringaerodynamicexcitation AT jieweilin numericalstudyonvibrationresponseandfatiguedamageofaxialcompressorbladeconsideringaerodynamicexcitation AT junhongzhang numericalstudyonvibrationresponseandfatiguedamageofaxialcompressorbladeconsideringaerodynamicexcitation
_version_	1718411297901510656

Numerical Study on Vibration Response and Fatigue Damage of Axial Compressor Blade Considering Aerodynamic Excitation

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