本文選題：液壓沖擊器 + 計(jì)算流體動(dòng)力學(xué)　； 參考：《上海工程技術(shù)大學(xué)》2011年碩士論文

【摘要】：本文闡述了液壓沖擊器國(guó)內(nèi)外發(fā)展趨勢(shì)和最新研究現(xiàn)狀，以某一型號(hào)氣液聯(lián)合式液壓沖擊器為研究對(duì)象，建立了液壓沖擊器的二維和三維模型，分析了它的工作原理，介紹了它的主要參數(shù)。通過(guò)建立沖擊器系統(tǒng)的數(shù)學(xué)模型，研究了沖擊器系統(tǒng)各參數(shù)對(duì)沖擊器工作性能的影響。運(yùn)用MATLAB的Simulink仿真軟件包分別對(duì)液壓沖擊器的回程加速過(guò)程和沖程過(guò)程進(jìn)行仿真研究，并對(duì)氮?dú)馐翌A(yù)充壓力對(duì)沖擊器沖擊性能的影響程度進(jìn)行了深入分析。結(jié)果表明：氮?dú)馐翌A(yù)充壓力過(guò)大，則會(huì)導(dǎo)致液壓油推不動(dòng)活塞進(jìn)行回程，液壓沖擊器起動(dòng)不了；壓力過(guò)小則很容易造成沖擊壓力升不上去，沖擊能小。 在參閱大量國(guó)內(nèi)外有關(guān)計(jì)算流體動(dòng)力學(xué)、流場(chǎng)的數(shù)值模擬方法、流場(chǎng)可視化技術(shù)等相關(guān)資料的基礎(chǔ)上，利用AutoCAD和CATIA軟件分別建立了沖擊器管道和換向閥的幾何模型；然后利用前處理軟件GAMBIT進(jìn)行網(wǎng)格的劃分。應(yīng)用CFD分析軟件FLUENT，用有限元方法對(duì)各種復(fù)雜流道和換向閥節(jié)流口處的流場(chǎng)進(jìn)行數(shù)值模擬。并將計(jì)算結(jié)果以圖像的形式給出，在此基礎(chǔ)上定性分析了流體速度、流線、漩渦與能量損失的關(guān)系。 本文通過(guò)對(duì)直角彎管、偏心相交管道流場(chǎng)進(jìn)行的數(shù)值模擬，分別得出了直角彎管、偏心相交管道的壓力、速度、流線可視化圖象，指出了流體流動(dòng)時(shí)渦旋產(chǎn)生的位置和強(qiáng)弱情況。通過(guò)對(duì)流場(chǎng)數(shù)值模擬，得出了直角彎管進(jìn)油流量與壓力損失差之間的關(guān)系。 闡述滑閥式換向閥的工作特點(diǎn)及工作過(guò)程，結(jié)合其工作特點(diǎn)選擇了流體控制體積，確定了研究區(qū)域的邊界條件。模擬了換向閥工作過(guò)程中的流場(chǎng)結(jié)構(gòu)的變化情況，，定性的分析換向閥產(chǎn)生能量損失的原因。 本文進(jìn)行的研究工作為液壓沖擊器系統(tǒng)的結(jié)構(gòu)設(shè)計(jì)和性能優(yōu)化提供一定的參考依據(jù)，將為液壓沖擊器的設(shè)計(jì)與開(kāi)發(fā)提供指導(dǎo)。
[Abstract]:In this paper, the development trend and the latest research status of hydraulic impactor at home and abroad are described. Taking a certain type of gas-liquid combined hydraulic impactor as the research object, the two-dimensional and three-dimensional models of hydraulic impactor are established, and its working principle is analyzed. Its main parameters are introduced. By establishing the mathematical model of the impactor system, the influence of the parameters of the impactor system on the working performance of the impactor is studied. The acceleration process and stroke process of hydraulic impactor are simulated by Simulink software package of MATLAB, and the influence of nitrogen chamber precharge pressure on impact performance of hydraulic impactor is deeply analyzed. The results show that if the pressure of nitrogen chamber is too large, it will lead to the return of the hydraulic oil impinging piston, the hydraulic impactor can not start, and the pressure too small can easily cause the impact pressure to rise and the impact energy to be small. On the basis of referring to a lot of relevant data about computational fluid dynamics, numerical simulation method of flow field, visualization technology of flow field and so on, the geometric models of impactor pipeline and directional valve are established by using AutoCAD and CATIA software respectively. Then we use the pre-processing software GAMBIT to divide the grid. The flow field at the throttle of various complex flow channels and directional valves is numerically simulated by using CFD analysis software fluent and finite element method. The results are given in the form of images. On this basis, the relationship between fluid velocity, streamline, vortex and energy loss is analyzed qualitatively. Based on the numerical simulation of the flow field of right angle curved pipe and eccentric intersection pipe, the visualization images of pressure, velocity and streamline line of right angle bend pipe and eccentric intersection pipe are obtained in this paper. The position and strength of vortex in fluid flow are pointed out. Through the numerical simulation of the flow field, the relationship between the inlet flow rate and the pressure loss difference is obtained. This paper describes the working characteristics and working process of the slide valve type directional valve, selects the control volume of the fluid and determines the boundary conditions of the study area according to its working characteristics. The change of flow field structure during the operation of reversing valve is simulated and the reason of energy loss is analyzed qualitatively. The research work in this paper provides a certain reference for the structure design and performance optimization of the hydraulic impactor system, and will provide guidance for the design and development of the hydraulic impactor.
【學(xué)位授予單位】：上海工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH137

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 周志鴻,高麗穩(wěn),許同樂(lè),張康雷,李靜;我國(guó)液壓破碎錘發(fā)展與現(xiàn)狀分析[J];工程機(jī)械;2004年08期

2 劉忠;y嚫＠

本文編號(hào)：1942423