Abstract
In recent years, much attention has been given to hydrostatic/hybrid journal bearings in research due to their wide spread engineering applications, such as: high speed turbomachinery, machine tools spindles, cryogenic equipment, and precision grinding. However, the activity toward improved understanding of the flow regimes and the associated pressure pattern in the recess flow phenomena is still needed. The objective of this work is to provide an understanding of the influence of regime flow in recess on the pressure field of hydrostatic bearing flat pad fed by orifice restrictor and orifice inertia. 3D Reynolds averaged Navier Stokes equations with the SST-k ω turbulence model are applied in order to investigate the effects of pressure supply, dynamic viscosity and recess depths on the pressure profile. The finite volume method implemented in the ANSYS-CFX software is used. To prove the robustness of CFD code, a comparison of the numerical results and the Reynolds equation is performed at very deep recess. The results exhibit very good agreements between CFD and Reynolds equation methods. On the other hand, the several cases treated in this work contribute also to analyze and to explain the main reasons providing the inertia and the Rayleigh effect in recess flow.
Highlights
The comprehension of flow behavior inside the hydrostatic recess is a subject of several researches
In order to solve the Reynolds equation (Eq (1)), it is assumed that: (i) the recess depth is considered very deep; (ii) at the external boundary, nodal pressures are zero; (iii) the nodal pressures for node on the recess are constant and equal to Pi; (iv) flow of lubricant through the restrictor is equal to the journal bearing input flow; (v) negative pressure is set to zero during the interactive process to take care of oil film cavitations
The performance of pressure field inside recess of hydrostatic bearing flat pad feeded by an orifice restrictor was analyzed using the 3DNavier-Stokes equations
Summary
The comprehension of flow behavior inside the hydrostatic recess is a subject of several researches. Most of the recent studies are based on the classical Reynolds equation, or its modified forms, where turbulence or variable properties of flow are taken into account. The main operational parameters considered in the several numerical and experimental researches were shaft speed, inlet jet pressure supply and the Reynolds number [1,2,3,4,5,6,7,8,9]. The activity toward improved modeling of the flow in the hydrostatic pocket has increased by using formulation of the 3DNavier Stocks equations [17,18,19,20] to provide a better understanding of the physics of flow in the recess
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