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基于模型试验准则的重力式圆形网箱水动力比较研究

  

  1. （1 中国海洋大学水产学院，山东 青岛 266003；
    2 山东大学（威海）海洋学院，山东 威海 266071）
  • 出版日期:2018-04-20 发布日期:2018-08-02
  • 作者简介:黄六一（1970—），男，教授，博士，研究方向：增殖养殖工程。E-mail：huangly@ouc.edu.cn
  • 基金资助:
    山东省重点研发计划（2016CYJS04A01-5，2017CXGC0107）；国家海洋局项目（GHME2016YY02）

Comparing on hydrodynamics of circular gravity type sea cage based on model experiment criterions

  1.  (1 College of Fisheries, Ocean University of China, Qingdao 266100, China;
    2 College of Marine, Shandong University at Weihai, Weihai 264209, China)
  • Online:2018-04-20 Published:2018-08-02

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摘要： 模型试验准则是水槽模型试验的核心问题，关系到最终推算实物系统结果的准确性。该文以中国常用的高密度聚乙烯（HDPE）圆形重力式网箱为研究对象，采用田内准则和狄克逊准则为模型试验准则，以大比例尺10:1、小比例尺2:1设计制作了网箱模型，在循环动力水槽中分别进行网箱水动力特性模型试验，比较在水流作用下两种试验准则的试验结果及其差异性。结果显示，网箱整体和网箱箱体的阻力随着流速增加而增加，二者呈幂函数关系；网箱整体阻力系数（C）随着雷诺数（Re）的增加而减小，二者的关系为C=17.587 Re-0.354 （R2 = 0.941）；C随着Re的增加而减小，二者的关系为：C=30.526 Re-0.424 （R2 = 0.902）；在实际流速30~130 cm/s范围内，田内准则的试验数据比狄克逊准则的试验数据稍小，二者的阻力差约为-5%。由试验结果可知，田内准则和狄克逊准则均可用于网箱模型水流试验。该研究结果可为网箱模型实验准则的选择和圆形网箱水动力学计算提供理论依据和基本参数。

关键词: HDPE圆形网箱, 水动力, 田内准则, 狄克逊准则

Abstract: Model experiment criterion is the core of flume model experiments, which will directly influenced the accuracy of the final results. In this paper, we made a research on a widely used circular HDPE sea cage system in China. We designed and made the cage model under the Tauti Criterion and Dickson Criterion (the large scale is 10, and the small scale is 2). The hydrodynamic model experiments are conducted in a circulation water channel, so as to compare the different results under the two criteria. The studies showed that drag of the whole cage and cage net decreases as the velocity increases, and there is a power function relationship between them; the whole cage’s drag coefficient decreases as the Reynolds number(Re) increases, which can be expressed as C=17.587 Re-0.354(R2 = 0.941); the relationship between net’s drag coefficient and Reynolds number is same to the whole cage’s, C=30.526 Re-0.424 (R2 = 0.902); When the actual velocity is 30cm/s-130cm/s, the experiment results under Tauti Criterion are always about 5% smaller than that under Dickson Criterion. The results showed both the two criteria can be exactly used in the cage model experiment. This paper provided theoretical basis and basic parameters to circular cage’s hydrodynamic calculation.

Key words: circular HDPE sea cage, hydrodynamics, Tauti Criterion, Dickson Criterion