Fast analysis of blade aerodynamic force under wake excitation

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 139-145.

LUO Xiao1, LI Lizhou1, ZHANG Xinyan1, ZHANG Jun2, YANG Minglei1, YUAN Meini1

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Abstract

To quickly solve blade aerodynamic force under wake excitation, the blade aerodynamic force reduced order model (ROM) method based on the harmonic balance method was proposed here.Through further studying this method, it was found that under small turbulence, proportional coefficients between aerodynamic force’s harmonic amplitudes and wake harmonic amplitudes are only related to wake frequencies.Based on this finding, the fast analysis method of blade aerodynamic force was proposed.Firstly, proportional coefficients between aerodynamic force’s harmonic amplitudes caused by wake harmonics and wake harmonic amplitudes were obtained, and then the relation curves between these proportional coefficients and wake harmonic frequencies were fitted.For any wake, proportional coefficients corresponding to its various harmonics were acquired through these curves interpolation, further blade aerodynamic force harmonic amplitudes were gained.Finally, the blade aerodynamic force ROM was used to solve blade aerodynamic force under wake excitation.The example calculation results showed that the proposed fast analysis method can be used to rapidly and accurately estimate blade aerodynamic force under any wake excitation without needing to do repeatedly CFD aerodynamic force computation for wakes of different frequencies.

Key words

wake / reduced order model (ROM) / influence coefficient method / aerodynamic force / blade / harmonic balance method

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LUO Xiao1, LI Lizhou1, ZHANG Xinyan1, ZHANG Jun2, YANG Minglei1, YUAN Meini1. Fast analysis of blade aerodynamic force under wake excitation[J]. Journal of Vibration and Shock, 2019, 38(23): 139-145

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