本文選題：表面織構(gòu) + 靜壓潤滑�。� 參考：《武漢理工大學》2012年碩士論文

【摘要】：隨著社會的發(fā)展,人們在設計機械系統(tǒng)時對環(huán)保與效率的要求越來越高,而零件的摩擦學性能對于提高整個機械系統(tǒng)的性能和使用壽命有著重要意義。與普通摩擦表面相比,具有適當織構(gòu)形式的摩擦表面會有更好的流體循環(huán)特性和潤滑特性,所以在表面織構(gòu)理論在工程領(lǐng)域得到了廣泛的應用。由于織構(gòu)體表面分布有交錯的網(wǎng)狀溝槽,因而在潤滑機理上建立準確的潤滑模型具有很大的困難。本文針對液體潤滑的基本特點,結(jié)合現(xiàn)有的織構(gòu)表面潤滑理論基礎及實踐經(jīng)驗,對其潤滑機理做了初步探究,并在理論分析和仿真計算的基礎上對不同的二維以及三維織構(gòu)模型進行了探討,并對四邊形和六邊形網(wǎng)狀織構(gòu)表面的動壓特性進行了研究。 本文首先建立了幾種不同的二維織構(gòu)模型以及四邊形網(wǎng)狀溝槽表面和六邊形網(wǎng)狀溝槽表面織構(gòu)模型,闡述了微循環(huán)織構(gòu)的幾何特征及其流體動壓潤滑的基本工作原理。然后應用計算流體力學中的FLUENT軟件進行迭代計算,成功地將其引入到表面織構(gòu)微循環(huán)領(lǐng)域。表面織構(gòu)動壓特性的研究多采用簡化的解析方法或數(shù)值解法,數(shù)值解法主要是有限元法和有限差分法,計算效率較低,而FLUENT軟件采用的是近年發(fā)展非常迅速的有限體積法,計算效率和精度都很高。該軟件對邊界條件、計算模型、控制參數(shù)及網(wǎng)格質(zhì)量方面都有嚴格要求。本文應用它對各種微循環(huán)織構(gòu)體的壓力場和速度場進行了仿真分析,得出了潤滑液體在流場內(nèi)部的壓力分布云圖、速度分布矢量圖和重要截面上的壓力散點圖并計算出了在旋轉(zhuǎn)壁面上形成的舉升力。通過對云圖和數(shù)據(jù)的分析,探討了兩種織構(gòu)表面情況下產(chǎn)生不同結(jié)果的原因。分析表明,在具有相同深度的不同二維織構(gòu)中,其表現(xiàn)出的動壓特性隨著傾角的增大有減小的趨勢；而三維織構(gòu)體中,六邊形網(wǎng)狀表面織構(gòu)模型的微循環(huán)特性和潤滑特性更好。 最后,為了驗證六邊形網(wǎng)狀織構(gòu)模型的優(yōu)越性,對不同進出口條件和不同潤滑液體條件下的潤滑性能進行了研究,結(jié)果表明,兩種不同織構(gòu)模型在相同條件下,六邊形織構(gòu)表面的潤滑性能要優(yōu)于四邊形織構(gòu)表面。
[Abstract]:With the development of society, environmental protection and efficiency are required more and more in the design of mechanical system, and the tribological performance of parts is of great significance to improve the performance and service life of the whole mechanical system. Compared with common friction surfaces, friction surfaces with proper texture form have better fluid circulation and lubricating properties, so the theory of surface texture has been widely used in engineering field. It is difficult to establish an accurate lubrication model on the lubrication mechanism because there are staggered mesh grooves on the surface of the texture. According to the basic characteristics of liquid lubrication, combined with the existing theoretical basis and practical experience of texture surface lubrication, this paper makes a preliminary study on its lubrication mechanism. On the basis of theoretical analysis and simulation, different two-dimensional and three-dimensional texture models are discussed, and the dynamic compression characteristics of quadrilateral and hexagonal reticulated textures are studied. In this paper, several different two-dimensional texture models and the surface texture models of quadrilateral and hexagonal reticulated grooves are established. The geometric characteristics of microcyclic textures and the basic working principle of hydrodynamic lubrication are described. Then the FLUENT software in computational fluid dynamics is applied to iterate calculation and it is successfully introduced into the field of surface texture microcirculation. The study of the dynamic pressure characteristics of surface texture mostly adopts simplified analytical method or numerical method. The numerical method is mainly finite element method and finite difference method, and the calculation efficiency is low. The FLUENT software uses the finite volume method, which has been developed very rapidly in recent years. The calculation efficiency and precision are very high. The software has strict requirements for boundary conditions, computational models, control parameters and mesh quality. In this paper, the pressure field and velocity field of various microcirculatory textures are simulated and analyzed, and the pressure distribution of lubricating liquid in the flow field is obtained. The velocity distribution vector diagram and the pressure scatter plot on the important section are calculated and the lift force formed on the rotating wall is calculated. Based on the analysis of cloud map and data, the causes of different results in the case of two kinds of texture surface are discussed. The analysis shows that the dynamic pressure characteristics of the two dimensional texture with the same depth decrease with the increase of the inclination angle, while the microcirculation and lubrication characteristics of the hexagonal reticulated surface texture model are better in the three dimensional texture. Finally, in order to verify the superiority of hexagonal mesh texture model, the lubricating properties of two different texture models under different inlet and outlet conditions and different lubricating liquid conditions are studied. The results show that the two different texture models are under the same conditions. The lubrication performance of hexagonal texture surface is better than that of quadrilateral texture surface.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH117

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