School of Civil & Environmental Engineering and Geography Science, Ningbo University, Zhejiang, China.
School of Civil & Environmental Engineering and Geography Science, Ningbo University, Zhejiang, China E-mail:
Water Sci Technol. 2024 Jul;90(1):344-362. doi: 10.2166/wst.2024.207. Epub 2024 Jun 15.
Hydrodynamic separators are commonly used to control the total suspended solid concentration in stormwater before being discharged to natural water bodies. The separator studied in this paper, featuring a swirling flow generated by tangential inlet and outlet connections, was analyzed for its sediment removal efficiency in relation to sediment and flow rates. For the separator studied in this paper, the numerical model showed that the flow field was favorable for the sediments to gather at the center and settle. A higher flow rate or a smaller sediment diameter corresponded to a lower removal rate and vice versa. The dimension improvement for increasing the sediment removal rate was also studied. It was found that increasing the diameter of the separator showed a higher sediment removal rate compared with corresponding increase in the height of the separator. A dimensionless parameter was proposed to assess the sediment removal rate of a separator, which may be used for designing and optimizing such a device. The removal rate is positively correlated with the value. When the value reaches 0.5 or above, the sediment removal rate exceeds 80%, which is a good initial target value for designing this type of separator.
水力旋流分离器常用于控制雨水在排放到自然水体之前的总悬浮固体浓度。本文研究的分离器采用切线进出口连接产生的旋流，分析了其在与流速和泥沙浓度有关的泥沙去除效率。对于本文研究的分离器，数值模型表明，流场有利于泥沙在中心聚集和沉降。流速较高或泥沙粒径较小对应的去除率较低，反之亦然。还研究了通过尺寸改进来提高泥沙去除率。结果表明，与分离器高度的相应增加相比，增加分离器的直径显示出更高的泥沙去除率。提出了一个无量纲参数 来评估分离器的泥沙去除率，这可用于设计和优化此类装置。去除率与 值呈正相关。当 值达到 0.5 或更高时，泥沙去除率超过 80%，这是设计此类分离器的一个很好的初始目标值。
