水流作用下单体网格式锚碇网箱水动力特性研究

STUDY ON HYDRODYNAMIC BEHAVIORS OF SINGLE GRID MOORING NET CAGE UNDER CURRENT

运用刚体运动学原理及集中质量方法,建立了计算浮架、网衣、锚绳及浮子受力和运动的数学模型。利用此数学模型获得了水流作用下重力式网箱在网格式锚碇情况下的锚碇锚绳受力、浮架运动计算结果,并与试验结果进行了比较,二者符合程度较好。在此基础上,计算了在不同设计流速与流向作用情况下,锚绳受力、浮架运动及网衣变形。计算结果表明,在相同工况下,3类锚绳中,锚碇锚绳受力最大,连接锚绳受力次之,网格锚绳受力最小。两种流向相比,相同条件下斜向流作用时,锚碇锚绳、连接锚绳受力大于正向流作用,网格锚绳受力情况相反;浮架中心水平位移表现为斜向流作用大于正向流作用,两种流向作用下浮架中心的竖直位移、浮架倾角及网衣变形相近。

Based on rigid kinematics theory and lumped mass method,a numerical model of the single grid mooring net cage under current is developed by setting up the motion equations of floating system, net system,mooring system and floaters. Then the motion equations are solved by Runge-Kutta fifth-order method. In order to verify the numerical model,a series of physical model tests are carried out. According to the comparisons, the simulated results which agree well with the experimental data is given in this paper.