鱼类养殖对网箱周围流场特性影响研究  

Influence of cultured fish on flow field around net cage

作　　者：崔映雪 刘长根[1] 刘春宏 徐晓甫 谭赛飞 Ying-xue Cui;Chang-gen Liu;Chun-hong Liu;Xiao-fu Xu;Sai-fei Tan(Department of Mechanics,Tianjin University,Tianjin 300350,China;Tianjin Fisheries Research Institute,Tianjin 300457,China)

机构地区：[1]天津大学力学系,天津300350 [2]天津市水产研究所,天津300457

出　　处：《水动力学研究与进展（A辑）》2022年第3期284-291,共8页Chinese Journal of Hydrodynamics

基　　金：国家重点研发计划项目(2018YFD0900704);天津市科技重大专项与工程(18ZXRHSF00270);天津大学自主创新基金(2020XZC-0097)。

摘　　要：为分析网箱养殖鱼类对邻近海域流场的影响,该文将网箱内部简化为多孔介质,基于雷诺时均方程和Realizable k-ε湍流模型,耦合多孔介质模型,建立了研究鱼类对网箱周围流场影响的三维水动力学模型,研究了鱼所占养殖容积的不同体积分数和来流速度变化对网箱周围流速的影响。结果表明:当鱼所占体积分数较大时,网箱下游流速衰减区有小尺度涡旋形成,且体积分数越大,涡旋越靠近网箱;在不超过一般养殖密度的前提下,来流速度一定时,网箱下游流速先衰减后恢复并逐步趋于稳定,随其体积分数的增大,流速稳定后的值也越大,影响距离也逐渐减小;当鱼所占体积分数一定时,在来流流速不超过0.8m/s的情况下,随来流速度的增大,网箱下游流速恢复变慢,流速稳定值的变化范围不大,影响距离变远。In order to analyze the influence of cage cultured fish on flow field in the aquaculture area,the inner part of the net cage is simplified as porous media,based on Reynolds time-averaged equations and Realizable k-εturbulence models,coupled with the porous media model,a three-dimensional hydrodynamic model is established to study the influence of cultured fish on flow field around net cage.The effects of different fish volume fractions and freestream velocity on the flow field around the cage are investigated.The results show that when the volume fraction of fish is large,a small scale vortex is formed in the downstream velocity attenuation region of the cage,and the larger the volume fraction is,the closer the vortex is to the cage.Under the premise of not exceeding the general breeding density,when the inflow velocity is constant,the downstream velocity of cage decays,then recovers and gradually tends to be stable.When t he volume fraction of fish is constant and the inflow velocity is no more than 0.8 m/s,the downstream velocity of the cage will recover slowly with the increase of the inflow velocity,and the change range of the velocity stability value is small,and the influence distance becomes longer.

关 键 词：鱼类网箱 多孔介质模型 流速衰减 

分 类 号：O352[理学—流体力学]