Link between subsonic stall and transonic buffet on swept and unswept wings: from global stability analysis to nonlinear dynamics
Link between subsonic stall and transonic buffet on swept and unswept wings: from global stability analysis to nonlinear dynamics
复制标题
后掠翼和非后掠翼上的亚音速失速和跨音速抖振之间的联系：从全局稳定性分析到非线性动力学
作者：
Frédéric Plante;J. Dandois;Samir Beneddine;E. Laurendeau;D. Sipp
摘要本文研究了在亚音速失速和跨音速受振条件下机翼上出现的三维细胞图案。采用非定常reynolds -average Navier-Stokes模拟方法，对在展向上由周期边界条件封闭的三维无限掠型进行了数值模拟。在这两种流动条件下，观察到失速/冲击单元的发生，以及它们以与掠角成比例的速度对流。在跨声速自助餐条件下，这种现象叠加在已有文献记载的二维自助餐不稳定性上。这些结果表明，二维和三维自助餐的差异是由自助餐细胞的出现引起的，这种现象与低速时观察到的现象相似。然后用全局线性稳定性分析方法研究了这些现象，并假设了沿展向的周期性流动。从这些分析中得到了与二维自助餐相干的模态，以及失速条件下与二维涡旋脱落相干的模态。此外，在两种流动条件下，观察到一种不稳定模式，使人想起失速/自助餐单元。
Abstract This paper examines the three-dimensional cellular patterns appearing on wings in subsonic stall and transonic buffet conditions. Unsteady Reynolds-averaged Navier–Stokes simulations are carried out for three-dimensional infinite swept configurations closed by periodic boundary conditions in the spanwise direction. In both flow conditions the occurrence of stall/buffet cells is observed, as well as their convection at a speed proportional to the sweep angle. In transonic buffet conditions, this phenomenon is superimposed to the well-documented two-dimensional buffet instability. These results indicate that the discrepancies between two-dimensional and three-dimensional buffet are caused by the occurrence of buffet cells and that this phenomenon is similar to the one observed at low speed. These phenomena are then studied using global linear stability analysis with the assumption of a periodic flow in the spanwise direction. From these analyses a mode coherent with the two-dimensional buffet is obtained, as well as a mode coherent with two-dimensional vortex shedding in stall conditions. In addition, in both flow conditions an unstable mode reminiscent of stall/buffet cells is observed.
无限翼 Triglobal 冲击不稳定性研究
DOI：
10.2514/6.2020-1986
发表时间：
2020
期刊：
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影响因子：
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作者：
He W
通讯作者：
He W