Estimation of three-dimensional aerodynamic damping using CFD

Estimation of three-dimensional aerodynamic damping using CFD
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使用 CFD 估算三维空气动力阻尼

DOI:
10.1017/aer.2019.135
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发表时间:
2019
期刊:
The Aeronautical Journal
影响因子:
--
通讯作者:
Higgins R
Higgins R
中科院分区:
--
文献类型:
--
作者:
Higgins R

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失速颤振的气动弹性现象是与分离流相关的负气动阻尼的结果。在此基础上,进行了从时间推进气动弹性计算中估算气动阻尼的研究。在过渡到三维螺旋桨和全气动弹性计算之前,对NACA 0012翼型进行了初步研究。给出了气动阻尼的估算值,并与URANS和SAS进行了比较。在预测负阻尼估计值时,使用适当的紊流闭合以允许失速期间流动结构脱落被视为关键。从这项调查中发现,SAS方法能够捕获这两个翼型和3D测试用例。
Aeroelastic phenomena of stall flutter are the result of the negative aerodynamic damping associated with separated flow. From this basis, an investigation has been conducted to estimate the aerodynamic damping from a time-marching aeroelastic computation. An initial investigation is conducted on the NACA 0012 aerofoil section, before transition to 3D propellers and full aeroelastic calculations. Estimates of aerodynamic damping are presented, with a comparison made between URANS and SAS. Use of a suitable turbulence closure to allow for shedding of flow structures during stall is seen as critical in predicting negative damping estimations. From this investigation, it has been found that the SAS method is able to capture this for both the aerofoil and 3D test cases.
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