CAJ | 학술논문

为探索圆形重力式网箱在动态流场中的水动力学特性，同时获得网箱系统内部与周围流场分布及流速变化规律，设计了4种不同网目形状和不同网目大小的网箱模型（C1、C2、C3、C4），选取4种不同水流流速（0.068 m/s、0.105 m/s、0.143 m/s、0.182 m/s），分别采用声学多普勒流速仪（ADV）和粒子图像测速（PIV）技术对网箱系统内外的流速及流场变化进行测定。结果表明，ADV试验与PIV技术测量结果基本一致；来流速度不同时，单个网箱范围内的水流衰减程度差异不大；来流速度相同时，小网目网箱的减流效果优于大网目网箱；网目大小相同时，菱形网目网箱减流效果优于方形网目网箱；群组网箱减流效果明显，且随着水流通过网箱数目的增加，网箱内与网箱后的流速降低明显，其中第2个网箱中心的流速衰减率已经达到了67.6%，第4个网箱中心的流速衰减率为88.2%，网箱后的流速衰减率为72.1%。研究结果可为养殖生产实践中网箱类型的选择提供理论参考。
위탐색원형중력식망상재동태류장중적수동역학특성，동시획득망상계통내부여주위류장분포급류속변화규률，설계료4충불동망목형상화불동망목대소적망상모형（C1、C2、C3、C4），선취4충불동수류류속（0.068 m/s、0.105 m/s、0.143 m/s、0.182 m/s），분별채용성학다보륵류속의（ADV）화입자도상측속（PIV）기술대망상계통내외적류속급류장변화진행측정。결과표명，ADV시험여PIV기술측량결과기본일치；래류속도불동시，단개망상범위내적수류쇠감정도차이불대；래류속도상동시，소망목망상적감류효과우우대망목망상；망목대소상동시，릉형망목망상감류효과우우방형망목망상；군조망상감류효과명현，차수착수류통과망상수목적증가，망상내여망상후적류속강저명현，기중제2개망상중심적류속쇠감솔이경체도료67.6%，제4개망상중심적류속쇠감솔위88.2%，망상후적류속쇠감솔위72.1%。연구결과가위양식생산실천중망상류형적선택제공이론삼고。
In order to understand hydrodynamic characteristics of circular gravity net cage in varied flow field,and obtain both the flow velocity variations and flow field distribution inside and around net cages,four models (C1,C2,C3,C4) were designed to be measured at specific measurement points at a velocity of 0.068 m/s,0.105 m/s,0.143 m/s and 0.182 m/s by acoustic Doppler velocimeter (ADV) and particle image velocimetry (PIV) technique. The experimental data showed that the measurement result of ADV was basically the same with that of PIV tech-nique. The ratio of flow velocity reduction inside a net cage remained approximately the same in different flow velocities. On the effect of the flow velocity reduction,the net cages with small mesh did better than the net cages with big mesh,and the net cages with diamond mesh did better than the net cages with round mesh at the same flow velocity. As current flowed through multiple net cages,the flow velocity was gradually reduced. The flow velocity inside and downstream from the net cages decreased with increasing number of net cages. The flow ve-locity reduction was 67.6%inside the second net cage,88.2%inside the forth net cage,and 72.1%downstream from multiple net cages. This research can provide a reference to a suitable type of net cages used in aquaculture production practice.