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Numerical study of buffet and transonic flutter on the NLR 7301 airfoil

机译：NLR 7301机翼上的抖振和跨音速颤振的数值研究

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摘要

Intensive numerical calculations have been carried out on the NLR 7301 supercritical airfoil section under transonic flow conditions. The airfoil is assumed to be suspended in a two degree of freedom aero elastic system allowing the airfoil to move in both pitching and plunging modes respectively. The numerical code used for the present investigation is a two-dimensional time accurate Navier-Stokes solver based on the full equations. The Spalart-Allmaras turbulence model has been used throughout the calculations. The elastic constraints, mass ratio, etc. have been taken from frequent tests in the DLR-DNW transonic wind tunnel carried out by the DLR Institute of Aeroelasticity in Goettingen, Germany. The numerical calculations have two goals: (1) investigation of the buffet boundary on the fixed airfoil under transonic flow conditions, (2) flutter investigations on the airfoil under aero elastic conditions. From the flutter calculations it has been shown that in addition to the Mach number, the neutral position of the torsion spring is of considerable importance for the investigation. Therefore this parameter has been studied in some detail. Numerical results obtained are presented in suitable form and compared with available experimental data.
机译：在跨音速流动条件下，对NLR 7301超临界翼型截面进行了密集的数值计算。假定机翼悬挂在两个自由度的空气弹性系统中，从而允许机翼分别在俯仰和俯冲模式下运动。用于本研究的数字代码是基于完整方程的二维时间精确Navier-Stokes求解器。在整个计算中都使用了Spalart-Allmaras湍流模型。弹性约束，质量比等是从德国哥廷根DLR气动弹性研究所在DLR-DNW跨音速风洞中进行的频繁测试获得的。数值计算具有两个目标：（1）在跨音速流动条件下对固定翼型的自助餐边界进行研究；（2）在空气弹性条件下对翼型进行颤振研究。从颤动计算中可以看出，除了马赫数之外，扭簧的中性位置对于研究也很重要。因此，已经对该参数进行了详细的研究。获得的数值结果以合适的形式呈现，并与可用的实验数据进行比较。

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