發(fā)布時(shí)間：2018-06-07 06:19

  本文選題：液壓油箱 + 歐拉-格朗日模型��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：顆粒物污染亦是液壓油的主要污染物之一。液壓油箱的的主要功能是存儲(chǔ)流體和補(bǔ)充液壓系統(tǒng)操作過(guò)程中所有的體積變化,除此之外液壓油箱提供了各種有利于系統(tǒng)和各類(lèi)元件的其他功能,其中,最為重要的是確保液壓組件在正常操作下油液中空氣的分離及固體顆粒污染物的沉淀,顆粒物作為液壓油箱中的污染物之一隨油液由泵吸入進(jìn)入液壓系統(tǒng),由于顆粒污染加速液壓元件的磨損、導(dǎo)致液壓閥的卡滯及系統(tǒng)故障,所以對(duì)于設(shè)計(jì)具有較高顆粒沉降速率的新型液壓油箱對(duì)液壓系統(tǒng)的整體性能及液壓組件的壽命至關(guān)重要。本論文通過(guò)數(shù)值模擬計(jì)算,分析獲得油箱中油液的流動(dòng)狀態(tài)和固體顆粒運(yùn)動(dòng)軌跡的分布,為新型液壓油箱的設(shè)計(jì)提供研究依據(jù)。研究結(jié)果表明:油箱中的某些循環(huán)區(qū)域會(huì)形成高湍流強(qiáng)度區(qū)域,顯著影響顆粒的運(yùn)動(dòng)。粒徑大的顆粒運(yùn)動(dòng)受到湍流的影響較小,粒徑小的顆粒運(yùn)動(dòng)易受到湍流影響;粒徑小的顆粒與流體之間有較好的跟隨性;顆粒運(yùn)動(dòng)過(guò)程中受到湍流的影響隨液流速度的增加而增強(qiáng);另外,通過(guò)對(duì)比分析不同結(jié)構(gòu)油箱中顆粒的沉降特點(diǎn),在油箱中設(shè)置隔板和擴(kuò)散器能延長(zhǎng)油液的流動(dòng)路徑、穩(wěn)定液流進(jìn)入油箱的狀態(tài)、增加顆粒的停留時(shí)間,提高固體顆粒的去除率。為新型液壓油箱的設(shè)計(jì)提供依據(jù)。第一章,通過(guò)液壓油箱的概述闡述了固液兩相流仿真技術(shù)在液壓系統(tǒng)中的應(yīng)用;概述了關(guān)于液壓油箱各方面性能提高的國(guó)內(nèi)外研究現(xiàn)狀及主要存在的問(wèn)題;對(duì)本論文的研究做了概括和總結(jié)。第二章,對(duì)油箱中顆粒運(yùn)動(dòng)所受力進(jìn)行理論分析,建立液壓油箱的CFD計(jì)算模型,運(yùn)用CFX軟件中的歐拉-拉格朗日模型對(duì)液壓油箱內(nèi)固-液兩相流流場(chǎng)進(jìn)行數(shù)值模擬,研究分析不同粒徑下顆粒的運(yùn)動(dòng)軌跡以及油液的流動(dòng)對(duì)顆粒運(yùn)動(dòng)的影響,提出了提高顆粒沉降的方法。第三章,結(jié)合上章計(jì)算結(jié)果的分析和設(shè)想,提出并建立了幾種不同結(jié)構(gòu)的油箱模型,根據(jù)油液的流動(dòng)狀態(tài)和顆粒物沉積的特點(diǎn)及運(yùn)動(dòng)軌跡,改變油箱的結(jié)構(gòu),分析結(jié)構(gòu)改進(jìn)后的流場(chǎng)分布,同時(shí)對(duì)固體顆粒分布進(jìn)行模擬,設(shè)計(jì)出具有較高顆粒沉降速率的新型液壓油箱。第四章,利用CFX軟件中的歐拉-歐拉模型,計(jì)算固體顆粒物在液壓油箱中的體積分?jǐn)?shù);分析不同模型中顆粒最終的集聚位置;并對(duì)不同油箱模型出口處顆粒的體積分?jǐn)?shù)進(jìn)行計(jì)算,從而對(duì)比說(shuō)明不同結(jié)構(gòu)中顆粒的沉降性能。本文基于理論分析和CFX數(shù)值仿真等手段,研究分析不同粒徑顆粒污染物在油箱的運(yùn)動(dòng)軌跡,獲得顆粒在油箱中運(yùn)動(dòng)的物理機(jī)制,從而以此為出發(fā)點(diǎn),提出了幾種不同的提高顆粒物沉降的結(jié)構(gòu),研究結(jié)果對(duì)于提高液壓油箱中顆粒污染物的沉降率有一定的指導(dǎo)意義,而且為新型液壓油箱的設(shè)計(jì)提供依據(jù)。
[Abstract]:Particulate matter pollution is also one of the main pollutants in hydraulic oil. The main function of the hydraulic oil tank is to store the fluid and replenish all the volume changes during the operation of the hydraulic system. In addition, the hydraulic oil tank provides a variety of other functions in favor of the system and various components, among which, The most important thing is to ensure the separation of air in the oil and the precipitation of the contaminants from the solid particles under normal operation of the hydraulic components. The particles, as one of the pollutants in the hydraulic tank, enter the hydraulic system with the suction of the oil through the pump. Particle pollution accelerates the wear of hydraulic components, which leads to the stagnation of hydraulic valves and system failure, so it is very important to design a new type of hydraulic oil tank with high particle settling rate for the whole performance of hydraulic system and the life of hydraulic components. In this paper, the flow state of the oil in the tank and the distribution of the motion trajectory of the solid particles are obtained by numerical simulation, which provides the basis for the design of the new type of hydraulic oil tank. The results show that some circulating regions in the tank will form a high turbulence intensity region, which has a significant effect on the movement of particles. The movement of particles with large particle size is less affected by turbulence, the movement of particles with small particle size is easily affected by turbulence, and the movement of particles with small particle size is better followed by fluid. The effect of turbulence on particle motion increases with the increase of liquid flow velocity. In addition, by comparing and analyzing the settling characteristics of particles in different oil tanks, the flow path of oil can be prolonged by setting separators and diffusers in the tank. Stable liquid flow into the tank state, increase the residence time of particles, improve the removal rate of solid particles. It provides the basis for the design of the new type hydraulic oil tank. In the first chapter, the application of solid-liquid two-phase flow simulation technology in hydraulic system is described through the overview of hydraulic tank, and the domestic and international research status and main existing problems of improving the performance of hydraulic tank in various aspects are summarized. The research of this paper is summarized and summarized. In the second chapter, the theoretical analysis of the force acting on the particles in the tank is carried out, and the CFD calculation model of the hydraulic tank is established, and the numerical simulation of the solid-liquid two-phase flow field in the hydraulic tank is carried out by using the Euler-Lagrange model in the CFX software. The effect of particle trajectory and oil flow on particle movement was studied and the method of increasing particle sedimentation was put forward. In the third chapter, combined with the analysis and assumption of the calculation results in the previous chapter, several oil tank models with different structures are put forward and established. According to the flow state of the oil and the characteristics and track of the particles deposition, the structure of the oil tank is changed. The flow field distribution of the improved structure is analyzed and the distribution of solid particles is simulated. A new type of hydraulic oil tank with high settling rate of particles is designed. In chapter 4, the volume fraction of solid particles in hydraulic tank is calculated by using Euler-Euler model in CFX software, and the final accumulation position of particles in different models is analyzed. The volume fraction of particles at the outlet of different fuel tank models is calculated, and the settling performance of particles in different structures is compared. Based on the theoretical analysis and CFX numerical simulation, this paper studies and analyzes the movement trajectory of different particle size pollutants in the tank, and obtains the physical mechanism of the particle movement in the tank, thus taking this as the starting point. Several different structures for increasing particle deposition are proposed. The results have certain guiding significance for improving the settling rate of particulate pollutants in hydraulic oil tanks and provide the basis for the design of new type hydraulic oil tanks.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TH137.5

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