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Non-Intrusive Measuring of Air-Water Flow Properties in Self-Aerated Stepped Spillway Flow

机译：自充气阶梯式溢流溢流流动中的空气流动性能的非侵扰性测量

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For hydraulic design of stepped spillways, knowledge of flow properties as flow depth and velocity of the air-water mixture is essential. Generally, these parameters are measured on largescale models by use of an intrusive probe (i.e. double-tip conductivity or fiber-optical probe) and scaled to prototype dimensions. In this paper the capability and limitation of non-intrusive measuring devices are analysed by comparison with a large model data set measured with a double-tip conductivity probe in skimming flow regime. In fact, flow depths are measured with an ultrasonic sensor and velocity fields are determined by use of a modified high-speed PIV method (Bubble Image Velocimetry). The results indicate that non-intrusive devices may be applied for a first estimation of flow properties with sufficient accuracy. The flow field above the pseudo-bottom and within the cavity ofthe steps can be visualized in high resolution.
机译：对于阶梯式溢洪道的液压设计，流动性能作为空气 - 水混合物的流动性能和速度至关重要。通常，这些参数通过使用侵入式探头（即双尖电导率或光纤探针）在大型型号上测量并缩放到原型尺寸。本文通过用双尖电导率探针测量的大型模型数据集来分析非侵入式测量装置的能力和限制。实际上，利用超声波传感器测量流动深度，并且通过使用改进的高速PIV方法来确定速度场（气泡图像速度）确定。结果表明，非侵入式设备可以应用于具有足够精度的流动性质的第一估计。伪底部和腔内的流场可以以高分辨率可视化。

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