Underwater LED-based Lagrangian particle tracking velocimetry

Underwater LED-based Lagrangian particle tracking velocimetry
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基于 LED 的水下拉格朗日粒子跟踪测速

DOI:
10.1007/s12650-022-00832-z
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发表时间:
2022
影响因子:
1.7
通讯作者:
Viola I
Viola I
中科院分区:
计算机科学4区
文献类型:
--
作者:
Viola I

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提出了一种适用于大型设备的白光体积流量测量新技术。这项技术能够以高时间和空间分辨率测量大体积,而不需要4类激光器。这种基于LED的拉格朗日粒子跟踪测速仪通过测量直径1.2米的潮汐涡轮机在直径25米,深度2米的水箱中的尖涡形成和近尾迹进行了演示。将七个沿流分布的感兴趣的体积组合在一起,每个体积长334 mm,宽244 mm,深140 mm,最大可达涡轮机下游的一个直径。系统在移动时不需要重新校准。假定流场为周期流,得到了时间分辨率为3.9ms、空间分辨率为5.4 mm的相平均流场。大体积和高时间和空间分辨率可以解决高雷诺数流动的关键研究问题,并可以为数值模式的开发和代码验证提供有价值的基准数据。
A new white-light volumetric flow measurement technique is presented that can be used in large-scale facilities. The technique enables large volumes to be measured with high temporal and spatial resolution and without the need for a class-4 laser. This LED-based Lagrangian particle tracking velocimetry is demonstrated by measuring the tip vortex formation and the near wake of a 1.2 m diameter tidal turbine in a 25 m diameter, 2 m deep tank. Seven streamwise-distributed volumes of interest are combined, each 334 mm long, 244 mm wide and 140 mm deep, reaching up to one diameter downstream of the turbine. The system does not require re-calibration when moved. By assuming a periodic flow field, a phase-averaged flow field was reconstructed with a temporal resolution of 3.9 ms and a spatial resolution of 5.4 mm. The large volume and high time and spatial resolution could enable key research questions to be addressed on high-Reynolds-number flows and could provide valuable benchmark data for numerical model development and code validation.Graphical abstract
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