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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >SIMULTANEOUS MEASUREMENTS OF PARTICLE SETTLING VELOCITY AND OSCILLATNG-GRID TURBULENCE
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SIMULTANEOUS MEASUREMENTS OF PARTICLE SETTLING VELOCITY AND OSCILLATNG-GRID TURBULENCE

机译：同时测量颗粒沉降速度和散射电网湍流

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Turbulence influence on the settling behavior of solid particles has attracted significant research efforts in the past decades, but remains challenging due to limitations in experimental techniques, especially in simultaneous two-phase measurements. In this study, a digital PIV system with enhanced shadow processing function was employed to conduct simultaneous velocity measurements of individual solid particles driven by gravity and the ambient fluid in a confined turbulent environment. The experiments were conducted in a water tank with turbulence generated by a grid oscillating in the vertical direction. Several types of grains, varying in shape and size, were tested with different oscillating frequencies. Settling behavior of solid particles subjected to ambient turbulent flow was analyzed in three aspects, i.e. settling velocity, relative settling velocity and settling velocity fluctuation, with respect to the simultaneous turbulent flow conditions. A small dynamic observation frame was first adopted for detailed flow sampling and the effect of secondary flow was also discussed.
机译：湍流对固体颗粒的沉降行为的影响引起了过去几十年的显着研究努力，但由于实验技术的局限性，特别是在同时两相测量中，仍然具有挑战性。在该研究中，采用具有增强的阴影处理功能的数字PIV系统来对由重力驱动的单独固体颗粒的同时测量和狭窄的湍流环境中的环境流体进行同时测量。实验在水箱中进行，湍流通过沿垂直方向振荡产生的湍流。用不同的振荡频率测试几种类型的晶粒，变化形状和尺寸。在三个方面分析了对环境湍流进行的固体颗粒的沉降行为，即稳定速度，相对沉降速度和沉降速度波动，相对于同时湍流条件。首先采用小型动态观察框架进行详细的流动取样，还讨论了二次流动的效果。

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