排水管道内湍动能分布特性及影响因素  

Characteristics and influencing factors of turbulent kinetic energy distribution in sewers

作　　者：王银亮[1] 艾海男[1] 黄维[1] 何强[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《环境工程学报》2015年第8期3637-3642,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年基金资助项目(51108480);中央高校基本科研业务费专项资金(106112012CDJZR210025)

摘　　要：污水中的污染物在管道输送过程中由于管道壁生物膜的微生物作用而发生降解,生化反应过程取决于物质从水相到生物膜之间的传质过程,传质过程受管道中流态特别是湍流作用的影响较大。采用PIV技术和FLUENT软件模拟下水道流态,重点研究充满度为0.1、0.2、0.3、0.4、0.5和坡度为0.003、0.005、0.008、0.01、0.03时水相中湍动能和湍动耗散率的沿程变化。结果表明,在充满度一定时管壁处的湍动能及湍动耗散率最大,且其随着坡度的增大而逐渐增大;坡度一定时,充满度越大管壁处湍动能及湍动耗散率越大。Pollutants in sewage degraded during transportation in pipeline because of the microbial reaction in biofilm. Microbial reaction was decided by the transfer process from aqueous phase to biofilm, which was af- fected by flow regime in pipe and especially turbulence. In this study, the PIV technology and FLUENT software were applied to simulate the sewer flow patterns and the changes of turbulent kinetic energy and turbulent dissipa- tion rate along the pipe were researched when depth ratios were 0. 1, 0.2, 0.3, 0.4, 0.5 and slopes were 0. 003, 0. 005, 0. 008, 0.01, 0.03. The results show that the turbulent kinetic energy and turbulent dissipation rate near pipe wall are largest in a certain degree of fullness and increase with the increase of slope. In a certain slope, the greater depth ratio is, the higher turbulent kinetic energy and turbulent dissipation rate are.

关 键 词：排水管道 湍动能 湍动耗散率 RNG k-ε 紊流扩散 

分 类 号：X703[环境科学与工程—环境工程]