摘要 The submerged propeller is an efficient diving mix device, which is applicable for oxidation ditch treatment in industry, city and village wastewatertreatment plant. The impeller structure and reasonable rotating speed are important factors that determine flow field distribution and energy conversion efficiency. So it is necessary to use modern design methods to develop new kinds of high efficiency submerged propellers, and research the flow field characteristics of submerged propellers. On the basis of the existing form drawing, threedimensional model of submerged propellers and unstructured tetrahedral mesh were generated. Based on Navier-Stokes equations and standard k-ε turbulence model, the flow was simulated by using a simple algorithm. Through changing some design parameters of propellers, the corresponding numerical simulation results reveal that for the same impeller diameter and service area of submerged propellers, the power consumption could be reduced effectively by optimizing blade mounting angle, which can determine the best blade mounting angle and most suitable rotational speed under given conditions. The study can provide theoretical and project guidance for submerged propellers design.
Abstract：The submerged propeller is an efficient diving mix device, which is applicable for oxidation ditch treatment in industry, city and village wastewatertreatment plant. The impeller structure and reasonable rotating speed are important factors that determine flow field distribution and energy conversion efficiency. So it is necessary to use modern design methods to develop new kinds of high efficiency submerged propellers, and research the flow field characteristics of submerged propellers. On the basis of the existing form drawing, threedimensional model of submerged propellers and unstructured tetrahedral mesh were generated. Based on Navier-Stokes equations and standard k-ε turbulence model, the flow was simulated by using a simple algorithm. Through changing some design parameters of propellers, the corresponding numerical simulation results reveal that for the same impeller diameter and service area of submerged propellers, the power consumption could be reduced effectively by optimizing blade mounting angle, which can determine the best blade mounting angle and most suitable rotational speed under given conditions. The study can provide theoretical and project guidance for submerged propellers design.
收稿日期: 2012-09-15
通讯作者:
Zhou Daqing(1976—), male, birth in Taishun County, Zhejiang Province, associate professor, Ph.D(zhoudaqing@hhu.edu.cn), research field: fluid machinery and engineering.
作者简介: Wu Siyuan(1988—), male, birth in Zhongwei County, Ningxia Province, master candidate(wusiyuan571@163.com), research field: fluid machinery numerical simulation.
引用本文:
Wu Siyuan, Zhou Daqing, Zheng Yuan. Numerical study on hydraulic performance of submerged propellers in oxidation ditch[J]. 排灌机械工程学报, 2014, 32(12): 1068-1073.
Wu Siyuan, Zhou Daqing, Zheng Yuan. Numerical study on hydraulic performance of submerged propellers in oxidation ditch. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(12): 1068-1073.
［1］Zhao Xingming, Wang Xuan, Wang Aijun. Flow beha viorsin bend channel of oxidation ditch［J］. Environmental Science ＆ Technology, 2008, 31(4): 104-106. (in Chinese) ［2］Tian Fei, Shi Weidong, Chen Bin, et al. Mixing performance investigation of sewage treatment mixer under multirotational speed［C］∥The 4th Hydraulic Machinery ＆ System Conference of China. 2011: 494-497. (in Chinese) ［3］Tian Fei, Shi Weidong, Lu Xining, et al. Numerical simulation of submersible mixer with three blades［J］. Journal of Drainage and Irrigation Machinery Engineering, 2012, 30(1): 11-14. (in Chinese)［4］Liu Yanchen, Shi Hangchang, Shi Huiming. Study on a discretetime dynamic control model to enhance nitrogen removal with fluctuation of influent in oxidation ditches［J］. Water Research, 2010,44(18): 5150-5157. ［5］Zhang Yu, Huang Weidong, Gou Quanzeng, et al. Application of computational fluid dynamics in design of oxidation ditch［J］. Industrial Water ＆ Wasterwater, 2009, 40(1): 49-53. (in Chinese) ［6］Yang Huazhan, Wang Tao, Deng Rongsen, et al. Research on flow characteristic of curve channel of integrated oxidation ditch［J］. Journal of Chongqing Jianzhu University, 2007, 29(3): 106-109. (in Chinese) ［7］Yang Yin, Yang Jiakuan, Zuo Jiaolan, et al. Study on two operating conditions of a fullscale oxidation ditch for optimization of energy consumption and effluent quality by using CFD mode［J］. Water Research, 2011,45(11): 3439-3452. ［8］Deng Rongsen. Wastewater treatment theory and techniques in oxidation ditch［M］. Beijing:Chemical Industry Press, 2006. ［9］Hao Dongwei,Wang Wenquan, Zhang Lixiang. Study on the effect of sliding mesh interface position on rotation flow fields in impeller mechanical［C］∥The 4th Hydraulic Machinery ＆ System Conference of China. 2011: 522-528. (in Chinese) ［10］Wang Fujun. Computational Fluid Dynamic Analysis: CFD Theory and Application［M］. Beijing: Tsinghua University Press, 2004. (in Chinese)
