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采用二维热线测量了旋转光滑直通道内不同流向位置上的平均速度和雷诺应力。实验结果表明:较高的当地旋转参数使得旋转对平均速度的影响区域扩大并且导致了前缘面附近湍流流动的再层流化。后缘面附近无量纲主流平均速度型严格按照旋转数顺序依次排列,且在对数律区呈现对数律分布。与此同时,所有无量纲雷诺应力分量在后缘面附近基本不受旋转影响。再层流化导致了前缘面附近无量纲主流平均速度型无法在对数律区维持对数律分布,且所有雷诺应力分量都随着旋转数和流向位置半径增大不断衰减;经过u-v象限分析,再层流化现象的直接原因被归于湍流脉动生成减少。
The two-dimensional hotline was used to measure the mean velocities and Reynolds stress at different flow-direction locations in a smooth and straight channel. The experimental results show that the higher local rotation parameters make the area of influence of the rotation on average velocity expand and lead to the re-fluidization of the turbulent flow near the front edge. The dimensionless mainstream average velocity near the trailing edge is arranged in order of rotation strictly, and the law of logarithm is presented in logarithmic law. In the meantime, all dimensionless Reynolds stress components are not substantially affected by rotation near the trailing edge. Re-laminarization leads to that the dimensionless mean velocity model near the leading edge can not maintain the logarithmic law distribution in the logarithm law region, and all the Reynolds stress components decay continuously with the increase of the number of rotations and the flow direction radius. After uv quadrant The direct cause of the re-laminarization was analyzed as turbulent pulsation generation reduced.