【摘要】：動靜壓氣體軸承是一種新型結構的氣體軸承,它綜合了靜壓與動壓氣體軸承的優(yōu)點,同時也避免了二者的不足,由于氣體的靜壓作用而產生的無固體接觸使得軸承在啟停階段的干摩擦得以避免,而軸承在高速旋轉時產生的動壓效應可以避免支承軸承所需的持續(xù)高壓供氣,這大大減小了功耗。 本文以動靜壓氣體軸承為研究對象,針對其流場內的建模、特性分析及結構參數優(yōu)化等內容進行了深入研究,具體的研究內容包括： 分析了不同網格劃分及數值計算方法對氣體軸承的適用性。以單孔靜壓止推氣體軸承為研究對象,研究了邊界層網格,并對不同網格疏密程度下的模型進行了數值仿真計算；同時使用層流模型及層流與紊流二者混合模型對靜壓氣體軸承的流場進行了計算。計算結果與實驗結果的對比分析表明,邊界層網格能更好地對近壁面流場特性進行研究；分區(qū)網格劃分方法可以達到很好的計算效率和精度；采用混合模型,不僅可以增大計算的精度,同時能更真實和直觀體現層流和紊流的流場效果。 采用三維流場計算方法研究了軸承結構及工作狀態(tài)對動靜壓氣體軸承特性的影響。建立動靜壓氣體軸承的三維模型,采用邊界層網格、分區(qū)劃分和局部加密的方法進行網格劃分；使用層流與湍流的混合模型進行三維計算。計算結果表明：三維建模的計算方法,可以有效地對氣體軸承的流場進行計算,同時通過與設計實例的對比,驗證了仿真結果的可靠性；在流場內,動壓槽部分的流動方式為湍流,氣膜間隙內的流動方式為層流；提升靜壓工作狀態(tài)下的供氣壓力,能夠提高軸承的承載能力和剛性,但會增大耗氣量；螺旋槽能夠在高速運轉過程中帶來明顯的動壓效應,但增大轉速會增加系統(tǒng)的功耗,并帶來不穩(wěn)定因素。 以上研究成果提供了動靜壓氣體軸承的設計理論,可供設計、計算同類動靜壓軸承時參考。
[Abstract]:The static and static pressure gas bearing is a new type of gas bearing. It combines the advantages of static and dynamic gas bearings and avoids the shortcomings of the two kinds of bearings. The non-solid contact caused by the static pressure of the gas avoids the dry friction of the bearing at the starting and stopping stage, and the dynamic pressure effect of the bearing during the high speed rotation can avoid the continuous high pressure gas supply needed to support the bearing. This greatly reduces power consumption. In this paper, the static and static gas bearing is taken as the research object, and the modeling, characteristic analysis and structural parameter optimization of the bearing in the flow field are studied deeply. The main contents are as follows: the applicability of different meshing and numerical calculation methods to gas bearing is analyzed. In this paper, the boundary layer mesh is studied with single hole static thrust gas bearing as the research object, and the model with different mesh density is numerically simulated. At the same time, the laminar flow model and laminar and turbulent flow model are used to calculate the flow field of hydrostatic gas bearing. The comparison between the calculation results and the experimental results shows that the boundary layer meshes can better study the characteristics of the flow field near the wall, and the partitioning method can achieve good computational efficiency and accuracy. The mixed model can not only increase the accuracy of calculation, but also reflect the effect of laminar and turbulent flow more realistically and intuitively. The influence of bearing structure and working state on the characteristics of static and static gas bearing is studied by using three dimensional flow field calculation method. The three-dimensional model of static and dynamic gas bearing is established, and the boundary layer mesh, partitioning and local encryption are used, and the mixture model of laminar flow and turbulence is used for 3D calculation. The results show that the three-dimensional modeling method can effectively calculate the flow field of the gas bearing, and the reliability of the simulation results is verified by comparing with the design example. In the flow field, the flow mode of the dynamic pressure groove is turbulent, the flow mode in the film clearance is laminar flow, the air supply pressure under the static pressure working state can increase the bearing capacity and rigidity, but it will increase the air consumption. The spiral groove can bring about obvious dynamic pressure effect in the high speed operation, but increasing the rotational speed will increase the power consumption of the system and bring the unstable factors. The above research results provide the design theory of the hydrostatic gas bearing, which can be used for reference in the design and calculation of the same kind of hydrostatic bearing.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH133.3

【引證文獻】

相關碩士學位論文 前1條

1 朱捚峰;動靜壓氣體止推軸承的承載特性研究[D];大連海事大學;2013年

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本文編號：2318191