池塘养殖跑道流场特性数值模拟及集污区固相分布分析  

Numerical simulation of flow field characteristics for aquaculture raceway and analysis of solid phase distribution in waste settling zone

作　　者：汪翔[1,2] 崔凯 李海洋[1,2] 蒋阳阳 何吉祥[1,2] 张静 Wang Xiang;Cui Kai;Li Haiyang;Jiang Yangyang;He Jixiang;Zhang Jing(Fisheries Research Institute,Anhui Academy of Agricultural Sciences,Hefei 230031;Key Laboratory of Aquaculture&Stock Enhancement for Anhui Province,Hefei 230031)

机构地区：[1]安徽省农业科学院水产研究所,合肥230031 [2]水产增养殖安徽省重点实验室,合肥230031

出　　处：《农业工程学报》2019年第20期220-227,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：安徽省科技重大专项(18030701169);特色淡水鱼产业技术体系(CARS-46);大宗淡水鱼产业技术体系(CARS-45);水产增养殖安徽省重点实验室;安徽省农科院重点及新兴学科培育项目(17A0514)

摘　　要：为探索池塘工程化跑道式循环水养殖系统中养殖区跑道内流场分布及集污区固相颗粒分布特征,该文以稠密离散相模型对养殖系统进行流速仿真,并对9组0.03~2.00 mm不同颗粒直径的总悬浮固体颗粒进行数值模拟。结果表明:养殖跑道内水流处于缓流状态,在水面区域形成的高速流场受重力和惯性作用沿养殖跑X轴方向由液面向底部下扫推进,推进到底部后流场趋于稳定。下扫推进过程中在前挡水墙与底部之间形成固有回流区,回流区特征长度与推水口平均流速呈线性关系。固相颗粒在养殖跑道对应的集污区里呈“U”形沉积分布,其中直径大于1.30 mm的固相颗粒沉积率在85%以上,直径小于0.60 mm的沉积率在44.13%以下,总沉积率为37.77%。研究表明,使用DDPM模型可初步评估池塘工程化跑道式循环水养殖系统设计对固相颗粒沉积的影响,系统中集污区对直径0.60~2.00 mm固相颗粒的沉积效果显著。In-pond raceway system(IPRS)that was introduced from the United States by American Soybean Association in 2014,and it has been rapidly applied in recent years.It has realized the transformation of aquaculture model from traditional low-efficiency culture to high efficient culture.Many problems that limit the further integration of aquaculture management have not been studied in depth due to the short application time.In order to explore the distribution of flow field of raceway and the solid phase distribution characteristics of waste settling zone in the culture unit of in-pond raceway system,in this study,the data were simulated by dense discrete phase model(DDPM)based on computational fluid dynamics(CFD)and then were analyzed to form the liquid phase velocity contours,liquid phase velocity path lines and solid-phase distribution characteristics.Firstly,the mesh of culture units was constructed by ICEMCFD software.Secondly,the velocity of flow and nine groups of total suspended solids with different particle sizes were simulated with DDPM using numerical simulation software of FLUENT.In this simulation,the boundary condition of the air inlet was set to the speed,and the other exits were regarded as the pressure outlet.Three-dimensional n-s equation and uncoupled implicit scheme were used for discretization using finite volume method.A three-dimensional equation and a non-coupling implicit scheme discretized by a finite volume method was used,a standard k-εtwo-equation turbulence model was selected,and a phase coupled SIMPLE algorithm was used as a numerical solution method in the separation pressure correction method in this study.The default standard format was selected in the pressure term of the velocity correction equation.The standard format,the diffusion term,the source term,and the convection term were all separated by a first-order upwind difference format.The velocity distribution of raceway in culture unit was detected by current meter,and the image for particle deposition in waste settling zone was

关 键 词：数值模拟 流场 模型 池塘工程化跑道式循环水养殖系统 流体力学 多相流 沉积率 

分 类 号：S954.12[农业科学—水产养殖]