本文選題：升船機(jī)　切入點(diǎn)：船廂　出處：《重慶交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：垂直升船機(jī)在設(shè)計(jì)過程中,為了降低升船機(jī)電氣拖動系統(tǒng)的功率和減少工程造價(jià),在滿足設(shè)計(jì)船型尺度和貨運(yùn)量的前提下,總是把承船廂尺寸和廂內(nèi)水深減小到最低限度,因此承船廂的斷面系數(shù)一般很小,船舶進(jìn)出船廂時的阻塞效應(yīng)十分明顯,船廂內(nèi)的水面波動十分顯著,進(jìn)而影響到升船機(jī)的運(yùn)行安全。目前國內(nèi)外對船廂水動力學(xué)的研究多以物理模型試驗(yàn)為主,針對船舶進(jìn)出船廂過程中廂內(nèi)水面波動的數(shù)值模擬研究相對較少。本文以長江上某升船機(jī)為參考研究對象,基于FLUENT流體力學(xué)數(shù)值模擬軟件,通過建立船舶進(jìn)出船廂這一過程的數(shù)學(xué)模型,采用RNG???雙方程紊流模型,自由水面利用VOF法技術(shù),并通過C語言編寫的UDF程序來定義船舶的運(yùn)動,模擬計(jì)算了不同船舶航速、不同船廂水深下,船舶進(jìn)出船廂過程中廂內(nèi)的水體運(yùn)動,得到以下結(jié)論:①船廂內(nèi)水面波動與船舶進(jìn)廂、出廂之間的關(guān)系。船舶駛出船廂的過程中,廂內(nèi)發(fā)生的水面降低值要大于水面涌高值,而在船舶駛進(jìn)船廂的過程中,廂內(nèi)發(fā)生的水面涌高值要大于水面降低值。船舶出廂是廂內(nèi)水面降低的控制性工況,船舶進(jìn)廂是廂內(nèi)水面涌高的控制性工況。②船廂內(nèi)水面波動與船舶航速、船廂水深之間的關(guān)系。在船舶出廂過程中,出廂速度的改變對廂內(nèi)水面降低值的影響要大于船廂水深對其產(chǎn)生的影響;但無論是船廂水深的改變還是船舶航速的改變,對廂內(nèi)水面涌高的影響均有限。在船舶進(jìn)廂過程中,進(jìn)廂速度的改變對廂內(nèi)水面涌高值的影響要大于船廂水深對其產(chǎn)生的影響;相較于船舶出廂時的情況,航速和船廂水深的改變對廂內(nèi)水面降低的影響有限。③船廂水面波動引發(fā)的船舶下沉量及安全航速公式探討。在船舶出廂過程中,廂內(nèi)水面波動會引發(fā)船體下沉,船舶的最大下沉量與航速密切相關(guān),在確保船廂富余水深的情況下有一個與之對應(yīng)的安全航速,通過對不同斷面系數(shù)下的安全航速進(jìn)行多項(xiàng)式擬合,得到了船舶進(jìn)出船廂的安全航速公式。
[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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U642

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

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本文編號：1652488