垂直升船机船舶进出船厢水动力学数值模拟研究

发布时间：2018-03-23 07:33

本文选题：升船机　切入点：船厢　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：垂直升船机在设计过程中,为了降低升船机电气拖动系统的功率和减少工程造价,在满足设计船型尺度和货运量的前提下,总是把承船厢尺寸和厢内水深减小到最低限度,因此承船厢的断面系数一般很小,船舶进出船厢时的阻塞效应十分明显,船厢内的水面波动十分显著,进而影响到升船机的运行安全。目前国内外对船厢水动力学的研究多以物理模型试验为主,针对船舶进出船厢过程中厢内水面波动的数值模拟研究相对较少。本文以长江上某升船机为参考研究对象,基于FLUENT流体力学数值模拟软件,通过建立船舶进出船厢这一过程的数学模型,采用RNG???双方程紊流模型,自由水面利用VOF法技术,并通过C语言编写的UDF程序来定义船舶的运动,模拟计算了不同船舶航速、不同船厢水深下,船舶进出船厢过程中厢内的水体运动,得到以下结论:①船厢内水面波动与船舶进厢、出厢之间的关系。船舶驶出船厢的过程中,厢内发生的水面降低值要大于水面涌高值,而在船舶驶进船厢的过程中,厢内发生的水面涌高值要大于水面降低值。船舶出厢是厢内水面降低的控制性工况,船舶进厢是厢内水面涌高的控制性工况。②船厢内水面波动与船舶航速、船厢水深之间的关系。在船舶出厢过程中,出厢速度的改变对厢内水面降低值的影响要大于船厢水深对其产生的影响;但无论是船厢水深的改变还是船舶航速的改变,对厢内水面涌高的影响均有限。在船舶进厢过程中,进厢速度的改变对厢内水面涌高值的影响要大于船厢水深对其产生的影响;相较于船舶出厢时的情况,航速和船厢水深的改变对厢内水面降低的影响有限。③船厢水面波动引发的船舶下沉量及安全航速公式探讨。在船舶出厢过程中,厢内水面波动会引发船体下沉,船舶的最大下沉量与航速密切相关,在确保船厢富余水深的情况下有一个与之对应的安全航速,通过对不同断面系数下的安全航速进行多项式拟合,得到了船舶进出船厢的安全航速公式。
[Abstract]:In the design process of vertical ship lift, in order to reduce the power of the electric drive system and reduce the project cost, under the premise of satisfying the design size of ship type and the quantity of cargo, the size of the ship compartment and the depth of water inside the car are always reduced to the minimum. Therefore, the cross-section coefficient of the compartment is generally very small, the blocking effect of the ship entering and leaving the compartment is very obvious, and the fluctuation of the water surface in the ship compartment is very significant. And then affect the safety of ship lift. At present, physical model test is the main research on hydrodynamics of ship compartment at home and abroad. There are few numerical simulation studies on the fluctuation of water surface in the cabin during the process of entering and leaving the ship. In this paper, a ship lift on the Yangtze River is taken as the reference object, and the numerical simulation software of fluid mechanics is based on FLUENT. By establishing the mathematical model of the process of entering and leaving the ship, RNG? ? ? In the two-equation turbulent model, the free water surface defines the ship's motion by using the VOF technique and the UDF program written in C language, and simulates and calculates the water body movement in the cabin during the process of entering and leaving the ship under different ship speed and different ship chamber water depth. The following conclusions are drawn: 1 the relation between the fluctuation of the water surface in the ship's compartment and the ship's entry and exit compartment. In the course of the ship's coming out of the ship's compartment, the water surface lowering value occurring in the cabin is greater than the water surge height, but in the course of the ship's entering the ship's compartment, The water surge height in the compartment is greater than that in the water surface reduction. The ship exit chamber is the controlled condition for the water surface reduction in the compartment. The ship entering compartment is the controlling condition for the water surge in the box. 2. The fluctuation of the water surface and the speed of the ship in the cabin. In the process of ship exit, the change of the velocity of the car has more influence on the lowering value of the water surface in the cabin than on the water depth of the ship, but whether it is the change of the depth of the ship's cabin or the change of the ship's speed of navigation, the influence of the depth of the ship's cabin is greater than that of the depth of the ship's cabin's water depth. In the process of entering a ship, the change of the velocity of the inlet box has more influence on the water surface surge value of the car than on the water depth of the chamber, compared with the case of the ship when it is out of the box, the influence of the water surge height on the water surface surge in the car is limited. The influence of the change of the Speed and the depth of the ship Box on the lowering of the Water Surface in the Box. 3 the formula of the sinking quantity and the safe speed of the ship caused by the fluctuation of the water surface of the ship box is discussed. In the process of the ship getting out of the car, the fluctuation of the water surface in the box will cause the sinking of the hull. The maximum sinking of the ship is closely related to the speed of the ship. There is a corresponding safe speed under the condition of ensuring the spare water depth of the ship's compartment. The polynomial fitting of the safe speed of the ship under different cross-section coefficients is carried out. The safe speed formula of the ship entering and leaving the ship compartment is obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U642

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