矩形水舱流体晃荡的水动力特性的试验研究

本文根据在上海交通大学船舶及海洋工程系船舶流体力学实验室进行的模型试验,论述了无制荡结构及具有内部制荡结构(制荡隔壁,深甲板梁——制荡板和船底宽肋板)时的水动力特性。对制荡效果作了讨论。 文中对试验数据进行了分析比较,与理论值及别的试验结果的比较表明,本文的试验结果是令人满意的。文中对试验数据进行了回归分析,得出可供设计参考的经验公式。最后对油船设计中如何考虑舱内流体的晃荡载荷提出建议。

EXPERIMENTAL INVESTIGATION ON THE HYDRODYNAMIC CHARACTERISTIC OF LIQUID SLOSHING LOADS IN RECTANGULAR TANKS

An experimental investigation on liquid sloshing in rectangular tank models has been carried out in the Ship Hydrodynamics Laboratory of Shanghai Jiao Tong University. This paper gives the hydrodynamic characteristics of dynamic loads induced by the liquid sloshing, such as the natural frequencies, the pressures and unstable phenomena. It may be useful for designers.The results obtained has been compared with that from the nonlinear sloshing theory used by FEM[1] and the experimental data given by M. Higuchi[2]. It can be seen that the results given in this paper are satisfactory and the formulae presented in this paper can be used as reference in estimating the natural periods of liquid sloshing and the magnitude of dynamic loads induced by the movement of liquid in rectangular tanks.It is shown that the experimental value of natural frequency in rectangular tank without the internal structures is about 1.13 times the theoretical value.The authors point out that the impact pressure at the deck corner and the noises caused by the sloshing load should be considered.In order to find a method to avoid the serious sloshing, the experimental investigation about the liquid sloshing in tanks with internal structures such as wash bulkhead, deep deck beam and bottom web frames has been made and their effectiveness of avoiding t he serious sloshing has been discussed. The results show that the deep deck beam is an efficient and economical structure if its lower edge immerges in the free surface of liquid.