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首页> 外文期刊>International Journal of Heat and Fluid Flow >Two-point correlation and integral scale of spatially advancing curved channel flow at friction-velocity-based Reynolds number 550
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Two-point correlation and integral scale of spatially advancing curved channel flow at friction-velocity-based Reynolds number 550

机译：基于摩擦速度的雷诺数550在空间上推进的弯曲通道流的两点关联和积分比例

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摘要

Two-point correlation and integral scale of curved channel turbulent flow were examined for onset and growth of large-scale vortex. Away from the two walls of the straight channel, the two-point correlation of streamwise velocity has large negative values around local minimum at y/delta = 1.6 and those of radial and spanwise components take small negative values at the same area. The large-scale motion in the straight channel is thus indicated to have conspicuous streamwise component and weak secondary motion. In the curved channel, two-point correlation of radial velocity decreased around the minimum away from the wall (y/delta = 1.6) and large negative values extended to the whole channel width. It is thus indicated that the large-scale vortex originated from the large-scale structures with conspicuous streamwise component in the outer-wall side, grew and expanded to the full channel width of the curved part. The integral scale integrating two-point correlation conditionally on the negative values greatly decreased to denote the onset and growth of the large-scale motion quantitatively. The local minima of two-point correlation for radial velocity were used as indicator of the large-scale vortex and near-wall small-scale vortex. The magnitude of it at the channel center area was as low as one thirds of those of near-wall area in the straight channel, and however increased and surpassed those of near-wall area in the curved channel. Therefore, large-scale vortices were weaker than the small-scale motion in the straight part of the channel, and they grew and surpassed the small-scale motion in strength in the curved part of the channel.
机译：研究了弯道湍流的两点相关性和积分尺度，研究了大尺度涡旋的发生和发展。远离直通道的两个壁，流向速度的两点相关在y / delta = 1.6处的局部最小值附近具有较大的负值，而径向和展向分量的两点相关在同一区域上具有较小的负值。因此，笔直通道中的大规模运动显示出明显的沿流分量和较弱的次级运动。在弯曲通道中，径向速度的两点相关性在远离壁的最小值处减小（y / delta = 1.6），并且较大的负值扩展到整个通道宽度。因此表明，大涡旋起源于在外壁侧具有明显的流向分量的大尺度结构，并增长并扩展到弯曲部分的整个通道宽度。有条件地在负值上积分两点相关性的积分标度大大降低，以定量地表示大规模运动的发生和增长。径向速度的两点相关的局部最小值被用作大涡旋和近壁小涡旋的指标。在通道中心区域的幅度仅为直通道近壁区域的三分之一，但在弯曲通道中增加并超过了近壁区域。因此，在通道的笔直部分，大型旋涡比小规模的涡流要弱，并且在通道的弯曲部分，它们的强度增长并超过了小尺寸的涡旋。

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