Fin characteristics of aerator devices with lateral deflectors

• Published in: Journal of hydrodynamics. Series B Vol. 25; no. 2; pp. 258 - 263
• Main Author: 吴建华 李丹 马飞 钱尚托
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.04.2013; Springer Singapore; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
• Subjects: aerator; Aerators; cavity length; Deflectors; Devices; Engineering; Engineering Fluid Dynamics; fin; Fins; flow; Fluid dynamics; Fluid flow; Holes; Hydrodynamics; Hydrology/Water Resources; lateral deflector; mathematical models; Numerical and Computational Physics; Simulation; 侧向; 偏转器; 导流板; 影响因素; 散热片; 曝气装置; 流动状态; 移动设备; fin; cavity length; lateral deflector; aerator
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(13)60361-3

The fins will be formed if the lateral deflectors in the side-walls with a bottom aerator device are improperly designed, and the flow regime downstream of the aerator device will be worsened. In this paper, the height and the length of the fins induced by the lateral deflectors are theoretically analyzed along with their influencing factors, and the fin characteristics are experimentally investigated on the basis of the theoretical analysis. It is shown that the intensities of the fins are strongly dependent on the ratio of the lateral cavity length to the bottom cavity length, and other factors, like the working head, the height and the angle of the lateral deflector, the flow Froude number around the aerator device, affect the fins indirectly through the changes of the lateral cavity length. When an aerator device with lateral deflectors is designed, it is crucial to match the above mentioned ratio, and to make the ratio of the two cavity lengths less than 1.0 in order to avoid the generation of the fins.