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UNSTEADY TRANSONIC FLOW AROUND A DELTA WING UNDERGOING PITCHING AND ROLLING OSCILLATIONS

机译:在达到音调和滚动振荡的三角翼的横向跨越式横向

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Unsteady transonic, vortex-dominated flow around a 65°-sharp edged, cropped-delta undergoing pitching and rolling oscillations has been investigated computationally. The wing mean angle of attack is 20° and the freestream Mach number and Reynolds number are 0.85 and 3.23 x10~6, respectively. The initial conditions of the flow at 20° angle of attack are characterized with a terminating transverse shock and vortex-breakdown of the leading-edge vortex cores. A fine O-H grid of 125x85x84 points in the wrap-around, normal and axial directions; respectively is used in the computational applications. The solutions are obtained using the unsteady, compressible, full Navier-Stokes equations which are integrated using an implicit, upwind, flux-difference splitting, finite-volume scheme. The computational applications cover two cases. In the first case, the wing is forced to oscillate in pitch around an axis at the quarter-chord length with an amplitude of 4° and a reduced frequency of π. In the second case, the wing is forced to oscillate in roll around the axis of geometric symmetry with an amplitude of 5° and a reduced frequency of 2π.
机译:在计算上调查了不稳定的横向,涡旋主导的65°-Sharp边缘,裁剪 - δ正在进行播放和滚动振荡的卷积。机翼平均攻角分别为20°,自发流Mach数和雷诺数分别为0.85和3.23 x10〜6。 20°攻角以20°攻角的流动的初始条件具有终止横向涡旋芯的横向冲击和涡流。环绕环绕环,正常和轴向125x85x84点的精细O-H网格;分别用于计算应用程序。使用非定常,可压缩,全Navier-Stokes方程获得解决方案,该方程通过隐式,上风,磁通差分裂,有限卷方案集成。计算应用涵盖了两种情况。在第一种情况下,机翼被迫在四分之一弦长的轴上围绕轴振荡,幅度为4°,频率降低。在第二种情况下,机翼被迫围绕几何对称轴振荡,幅度为5°,减小频率为2π。

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