This paper describes an experimental and theoretical research on the two-phase flow pattern transition of downflow in vertical helical coils in an air-water loop.

本文对低压水-空气两相流动在立式螺旋管内向下流动的流型及其转变特性进行了实验和理论研究。

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Protection design for lower reaches of the Yellow River was once a difficult question due to high water head, various combinations of discharging structures, and complex flow pattern.

小浪底工程由于水头高、泄水建筑物组合多，水流流态十分复杂，下游防护设计是一难题。

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The calculated results show that the established mathematical model can satisfactorily simulate the variation of water surface pattern and redistribution of velocity in bend flow.

计算和验证表明：建立的弯道水流数学模型能较好地模拟弯道水面形态变化和流速重分布。

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