摘要
针对污水处理池内易产生污泥沉积的现象,研究了叶轮直径对潜水推流器水力特性的影响。选取不同叶轮直径的潜水推流器作为研究对象,基于STAR-CCM+仿真软件,采用多面体网格划分方式,对潜水推流器进行全流场定常数值模拟,同时分析不同叶轮直径的潜水推流器在环形检验池和方形池中运行时池内流体的平均流速。结果表明,在相同功率下,潜水推流器在不同的池子中运行时,叶轮直径对潜水推流器的水力性能有很大影响。在环形检验池中,叶轮直径增大,潜水推流器的推流效果增强;在方形池中,随着叶轮直径的增大,潜水推流器的推流效果则先增强后减弱,当叶轮直径为3.7 m时,潜水推流器的推流效果最好。根据动量定理推导出潜水推流器的效率计算公式,并在该公式的基础上分析了潜水推流器在不同池型中推流效果不同的原因。
To prevent sludge deposition in sewage treatment pool, the influences of impeller diam- eter on the hydraulic characteristics of submersible propellers were investigated. Submersible propellers with different impeller diameter were simulated in annular test pool and square pool using STAR-CCM ＋ simulation software. The simulations used polyhedral mesh and constant parameters. The average flow rates in the two pools were analyzed. The results showed that the impeller diameter had a substantial im- pact on the hydraulic characteristics of the submersible propellers. In the annular test pool, the larger im- peller diameter, the better the pushing flow effect from submersible propellers. In the square pool, with the increase of impeller diameter, the pushing flow effect from the submersible propellers increased ini- tially and then decreased ; when the diameter of the impeller was 3.7 m, the pushing flow effect from the submersible propeller was the best. Based on the momentum theorem, the efficiency formula of the sub- mersible propellers was deduced, and the mechanism of the different pushing flow effect in different typesof pools was analyzed.
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第5期57-60,65,共5页
China Water & Wastewater
基金
安徽省合肥工业大学"秋实计划"A类计划项目(JZ2015QSJH0246)
关键词
潜水推流器
水力特性
叶轮直径
平均流速
效率
submersible propeller
hydraulic characteristics
impeller diameter
averageflow rate
effieiency
