Effects of axial spacing variation and coating on vibration of high-pressure turbine blades

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 322-327.

CHENG Qian1, WANG Hu1, SHEN Lian1, ZHANG Gen1, LAI Wei1, CAO Zheng2

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Abstract

In order to study the effects of different axial spacing and coatings on the vibration response of turbine blades, the unsteady flow of high-pressure turbine blade under the action of turbine guide vane wake is numerically simulated. The harmonic component of the airflow exciting force is obtained by FFT, which can get the harmonic pressure on the blade surface load through frequency domain decomposition, and combined with the blade forced response analysis method, The forced response analysis method of blade under three-dimensional unsteady flow field excitation is established. The root mean square of pressure disturbance is used as the quantitative parameter of aerodynamic excitation intensity, and the vibration response amplitude of blade under flow field excitation is obtained. The vibration response differences of blade with different axial spacing are compared, and considering the coating influence . The results show that the amplitude of blade vibration response decreases with the increase of axial spacing, that is, the increase of axial spacing can effectively reduce the vibration stress of blade; The blade coating also helps to reduce the vibration response amplitude of the blade.

Key words

High pressure turbine / Axial spacing / Coating / Unsteady flow field / FFT ;Vibration response

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CHENG Qian1, WANG Hu1, SHEN Lian1, ZHANG Gen1, LAI Wei1, CAO Zheng2. Effects of axial spacing variation and coating on vibration of high-pressure turbine blades[J]. Journal of Vibration and Shock, 2023, 42(9): 322-327

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