【摘要】：折褶濾芯過濾器以其顆粒收集效率高,使用壽命長,制造工藝流程簡單,易清洗更換等優(yōu)點廣泛應(yīng)用于各種自動化、醫(yī)藥衛(wèi)生、原子能工業(yè)和壓縮機等領(lǐng)域。但是對于流體介質(zhì)為液體的折褶濾芯數(shù)學模型研究較少。因此,研究流體在多孔介質(zhì)中的流動和雜質(zhì)顆粒在流體介質(zhì)中的流動規(guī)律,從而研究折褶濾芯滲透率等參數(shù)的數(shù)學模型尤為重要。這對于今后折褶濾芯的設(shè)計和制造具有重要作用。本文利用D2Q9格子玻爾茲曼模型研究折褶濾芯的滲透率。利用濾芯折褶率數(shù)學模型研究折褶濾芯兩側(cè)壓力降和周圍流場變化情況。并且運用數(shù)學語言描述雜質(zhì)顆粒的布朗運動和對流運動以及自身重力導致的雜質(zhì)顆粒沉積現(xiàn)象。(1)介紹格子玻爾茲曼離散方法和其D2Q9速度離散模型以及分子動理論基本原理。明確了格子玻爾茲曼方法本質(zhì)是粒子之間的碰撞與遷移,利用原理為動量守恒、能量守恒和質(zhì)量守恒。利用D2Q9格子玻爾茲曼模型進行滲透率公式的分析與驗證。(2)介紹計算流體力學(CFD),建立表示折褶高與折褶寬之間關(guān)系的濾芯折褶率數(shù)學模型。研究具有不同折褶率濾芯兩側(cè)壓力降變化和周圍的流場變化情況。(3)根據(jù)濾芯能夠完成過濾工作的本質(zhì)是雜質(zhì)顆粒的對流和擴散運動(布朗運動)。運用數(shù)學語言描述了雜質(zhì)顆粒在其它雜質(zhì)顆粒和自身重力作用下造成的在多孔介質(zhì)表面和內(nèi)部的沉積現(xiàn)象。研究具有雜質(zhì)顆粒沉積層的V型折褶濾芯兩側(cè)壓力降變化和流場變化情況。
[Abstract]:Folded filter is widely used in many fields, such as automation, medicine, hygiene, atomic energy industry and compressor, because of its advantages of high particle collection efficiency, long service life, simple manufacturing process and easy cleaning and replacement. It is very important to study the mathematical model of the parameters such as the permeability of folded filter element, which is very important for the design and manufacture of folded filter element in the future. In this paper, the permeability of folded filter element is studied by using D2Q9 lattice Boltzmann model. The pressure drop on both sides of the folded filter and the variation of the flow field around it are studied. The Brownian motion and convection of impurity particles and the deposition of impurity particles caused by gravity are described by mathematical language. (1) The lattice Boltzmann discretization method, its D2Q9 velocity discretization model and the basic principle of molecular motion theory are introduced. Lattice Boltzmann method is essentially the collision and migration between particles. The principle is momentum conservation, energy conservation and mass conservation. The permeability formula is analyzed and verified by using D2Q9 lattice Boltzmann model. (2) Computational Fluid Dynamics (CFD) is introduced to establish the mathematical model of filter core folding, which shows the relationship between folding height and folding width. (3) According to the fact that the filter element can complete the filtering work is the convection and diffusion movement of impurity particles (Brownian motion). Mathematical language is used to describe the porous media caused by impurity particles under the action of other impurity particles and gravity. The pressure drop and flow field on both sides of V-shaped folded filter core with impurity grain deposits are studied.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ051.85

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本文編號：2184684