下凹型内孤立波对细长潜体运动特性影响的实验研究

在大型重力式分层流水槽中,采用重力塌陷造波和模型半柔性约束方法,结合位移和倾角测量技术,对下凹型内孤立波作用下的细长潜体模型运动特性进行了实验研究,获得了模型垂/纵荡、横/纵摇和质心轨迹运动规律。研究表明:细长潜体模型在下凹型内孤立波作用下的质心运动轨迹近似于椭圆;模型垂/纵荡和横/纵摇运动主要受到波幅因子α(内波波幅与模型长度之比)和潜深的影响;当α固定时位于内孤立波上/下方的模型主要表现为纵荡,而位于穿越内孤立波位置的模型主要表现为垂荡,实验进一步证实了模型运动特性与内孤立波内部流场分布的相关性。

Experimental investigation on the kinematics characteristic of submerged slender body under internal solitary wave of depression

In this paper, the experimental study on the kinematics characteristic of submerged slender body under internal solitary wave of depression generated by gravity-collapse method is conducted in a largely gravitational stratified fluid tank, in which a semi-flexible restriction technique is used to control the slen-der body's equilibrium in the density stratification fluid. The quantitative measurement on the motions of slender body is carried out with both experimental displacement analysis and angel inclination instruments, and further the kinematic characteristics such as heave, surge, roll, pitch and its mass center trace are ob-tained. Experimental results show that the movement locus of the body's mass center is close to an oval. All of properties such as heave, surge, roll and pitch are depended of the dimensionless wave amplitude factorα (the ratio of wave amplitude to slender body's length) and the body position in depth. The surge move-ment of the slender body above or below the solitary internal wave is predominant as the parameterα keeps unchanged and its heave one of the body across the wave is predominant. It is further verified that the body's movement characteristic related to the inner flow in an internal solitary wave.