摘要： 为解决深远海养殖颗粒饲料长距离管道输送易产生的管道堵塞、饲料破碎问题，对研制的自动投饲系统进行验证。基于计算流体力学和离散单元法耦合方法（CFD-DEM），开展饲料运动状态、料气混合比、管路压降、管路堵塞与饲料碰撞情况分析，结合试验验证以考核仿真精度。结果表明，颗粒饲料进入管道后受气流拖拽力作用将被加速，颗粒饲料全局平均速度为8.5 m/s。下料口、弯管等处料气混合比高，压力损失大，饲料与饲料、管壁之间碰撞频繁，易导致饲料破碎、管路堵塞。经试验验证，流体仿真精度可达94.4%，可用于指导系统设计。自动投饲系统饲料破碎率0.40%，计量误差小于1.3%，吨料能耗3.11~6.40 kW·h，具有输料能耗低、不易堵塞、饲料破碎率低、计量精准的优点，适用于深远海养殖的应用场景。
关键词:
自动投饲系统,
气力输送,
颗粒饲料,
CFD-DEM,
养殖工船,
深海网箱
Abstract: The designed automatic feeding system is verified to solve problems of pipe blockage and feed crushing, which is founded frequently during long-distance pipeline transportation of pellet feed in scenes of deep-sea aquaculture. Using the computational fluid dynamics-discrete element method (CFD-DEM), the study is conducted to analyze the feed motion state, mix rate of feed-air, pipeline pressure drop, pipe blockage, and feed collision frequency in process of feed pneumatic conveying. Moreover, simulation accuracy will be verified by experiments. It is shown that feed pellets are accelerated after entering the pipeline, under the drag force of airflow. The average velocity of pellet feeds in the pipeline is 8.5 m/s. Phenomenons of feed crushing and pipeline blockage easily happen in positions such as feed outlets and elbows. In which the mix rate of feed-air and pressure drop are large, collisions occur frequently during feed and feed, feed, and an inner wall of the pipeline. Fluid simulation can be used to guide automatic feeding system design with a simulation accuracy of 94.4% after experimental verification. There are lots of advantages of an automatic feeding system, such as low energy consumption, low probability of pipeline blockage and feed crushing rate, accurate feed measurement, with a feed crushing rate of 0.4%, feed measurement error lower than 1.3%, energy consumption of feed pneumatic conveying of 3.11~6.40 kW·h/t. This study demonstrates that an automatic feeding system is applicable to scenes of deep-sea aquaculture.
Key words:
Automatic feeding system,
pneumatic conveying,
pellet feed,
CFD-DEM,
aquaculture vessel,
deep sea cage
黄建伟1,2，骆意1,2，魏树辉1,2，陈铭治3，朱端祥1，刘亮清1,2. 深远海养殖自动投饲系统仿真分析与试验验证[J]. 渔业现代化杂志, doi: 10.3969/j.issn.1007-9580.2022.05.009.
HUANG Jianwei1,2, LUO Yi1,2, WEI Shuhui1,2, CHEN Mingzhi3, ZHU Duanxiang1, LIU Liangqing1,2. Simulation analysis and experimental verification on automatic feeding system for deep sea aquaculture#br#[J]. , doi: 10.3969/j.issn.1007-9580.2022.05.009.