Abnormal changes of dynamic derivatives at low reduced frequencies

Weiwei ZHANG, Yiming GONG, Yilang LIU

科研成果: 期刊稿件文章同行评审

12 引用 (Scopus)

摘要

A number of studies have found that abnormal changes of dynamic derivatives occurred at very low reduced frequencies, but its inducement mechanism is not very clear. This paper has researched the abnormal changes and analyzed the influence on some parameters by solving the unsteady flow around forced oscillation airfoils based on Navier-Stokes equations. Results indicate that when the reduced frequency approaches to zero, the dynamic derivatives obtained by the numerical method will diverge. We have also proven it in theory that this phenomenon is not physical but completely caused by numerical singularity. Furthermore, the abnormal phenomenon can be effectively mitigated by using the time spectral method to solve the aerodynamic forces and the integral method to obtain the dynamic derivatives. When the reduced frequency is in the range of 0.001–0.01, the dynamic derivative maintains nearly unchanged for the whole speed region. This study can provide a reference for the reasonable choice of the reduced frequency in calculations and experiments of dynamic derivatives.

源语言英语
页(从-至)1428-1436
页数9
期刊Chinese Journal of Aeronautics
31
7
DOI
出版状态已出版 - 7月 2018

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