Abstract The issue of water scarcity in many countries across the globe has become one of the most pressing challenges due to the limited availability of renewable water resources. After rainfall, the runoff water picks up the topsoil and sweeps them downstream towards a river, downstream dam, and groundwater storage. The deposition of sediment may reduce the storage capacity of dams, lowering the ability to utilize the groundwater that is now considered as unusable wastewater and causing for the silted up canals to become inoperable. A hydrocyclone is an effective separation device wherein water is mixed with sands. It can be used to classify or filter specific solid and liquid components in a feed stream. This study investigates the flow field characteristic within the hydrocyclone. The Laser Doppler Anemometry (LDA) has been deployed to measure the mean velocities in the hydrocyclone. Traditionally, a flat surface box or jacket is used to encase the hydrocyclone, filled with water or other materials, to minimize the refraction effects of laser beams, which are caused by the curved solid wall of the hydrocyclone and the refractive index of the test medium. In this study, a new method is applied that enables us to use the LDA directly in the hydrocyclone wall without recourse to such a flat surface box or jacket.

中文翻译：

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水力旋流器流量特性和测量

摘要 由于可再生水资源的可用性有限，全球许多国家的水资源短缺问题已成为最紧迫的挑战之一。降雨后，径流水带走表土，将它们向下游冲向河流、下游大坝和地下水库。沉积物的沉积可能会降低水坝的蓄水能力，降低地下水的利用能力，这些地下水现在被认为是无法使用的废水，并导致淤塞的运河无法运作。水力旋流器是一种有效的分离装置，其中水与沙子混合。它可用于对进料流中的特定固体和液体成分进行分类或过滤。这项研究调查了水力旋流器内的流场特性。激光多普勒风速仪 (LDA) 已被用于测量水力旋流器的平均速度。传统上，使用平面盒或夹套来包裹水力旋流器，填充水或其他材料，以尽量减少激光束的折射效应，这是由水力旋流器弯曲的实体壁和测试介质的折射率引起的. 在这项研究中，应用了一种新方法，使我们能够直接在水力旋流器壁中使用 LDA，而无需求助于这种平面箱或夹套。