The instantaneous turbulent velocity field in a three-dimensional wall jet was estimated from the fluctuating wall pressure using a spectral Linear Stochastic Estimation (LSE) technique. The jet issued from a long square channel with Reynolds number of 90,000. Two downstream positions in the intermediate field were examined, x/h = 10 and x/h = 20, ow-ing to the rapid change in wall jet development over this region. The results indicate that the passage of the large-scale structures causes large, coherent lateral sweeps of fluid across the entire span of the wall jet. The sweeps appear to be caused by the pas-sage of half horseshoe-like structures. As the structures evolve downstream they develop a longer outer leg, and become more offset, traits that both contribute to the large lateral growth of this flow.
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机译：使用频谱线性随机估计（LSE）技术从波动的壁面压力估算三维壁面射流中的瞬时湍流速度场。飞机从雷诺数为90,000的长方通道发出。由于在该区域壁射流发展迅速变化，因此检查了中间场中的两个下游位置x / h = 10和x / h = 20。结果表明，大型结构的通过会在壁射流的整个跨度上引起较大且连贯的横向流体横扫。扫荡似乎是由半马蹄形结构的粘贴引起的。随着结构向下游发展，它们形成了更长的外部分支，并且变得更加偏移，这两个特征都有助于这种流动的横向增长。
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