摘要： 网衣清洗装备分流转盘内部流道结构直接影响了喷嘴射流性能，决定了装备清洗网衣的效果。采用流体力学原理，对直角L型和圆弧L型流道的喷嘴内部流场力学特性开展了数值模拟研究，并对流速、压强、空化等参数进行了分析。结果显示：直角L型流道出现流动的分离和附壁现象，内、外两侧均有涡流形成；圆弧L型流道仅外侧有涡流形成；圆弧L型流道与直角L型流道相比速度变化率更小，喷嘴出口射流速度更大；两种流道的喷嘴内均发生了剧烈的空化现象，圆弧L型流道喷嘴的空化区域面积和最大气相体积分数远大于直角L型流道喷嘴。本研究结果为网衣清洗装备分流转盘内部流道结构优化提供理论参考。

关键词: 深水网箱, 网衣清洗, 分流转盘, 流道结构, 力学特性, 数值模拟

Abstract: The internal flow channel structure of the divergent turntable directly affects the jet performance of the nozzle and determines the effect of cleaning the net. Based on the principle of fluid mechanics, a numerical simulation was carried out on the mechanical characteristics of the flow field in the nozzles with right-angle L-shaped and circular-arc L-shaped channels, and the flow velocity, pressure, cavitation and other parameters were analyzed. The results show that: the fluid in the right-angle L-shaped channel is separated and attached to the wall, vortices are formed on both the inner and outer sides; only vortex is formed on the outer side of the circular-arc L-shaped channel; the flow velocity change rate of the circular-arc L-shaped channel is smaller than that of the right-angle L-shaped channel, and the velocity of the nozzle outlet of the circular-arc L-shaped channel is larger; significant cavitation occurred in the nozzles with two both kinds of channel structures. The cavitation area and maximum atmospheric phase volume fraction of the circular-arc L-shaped channel nozzle are larger than those of the right-angle L-shaped channel nozzle. The research results can provide a theoretical reference for the optimal design of the internal flow channel of the divergent turntable of netting cleaning equipment. 

Key words: deep water cage, net cleaning, divergent turntable, flow channel structure, mechanical characteristics; numerical simulation