...Tianyou Yang; Jianlin Cai; Liwu Wang; Dongxing Tang; Shouan Chen; Jiaxu Wang The purpose of this study is to assess the role of turbulence on the lubrication performances of coupled journal-thrust water-lubricated bearing with micro grooves using a numerical model. The results of the simulation...

...Yingze Jin; Xiaoyang Yuan To improve the efficiency in nonlinear dynamic calculation of finite-length tilting-pad journal bearings (TPJBs) under dynamic loads, an analytical method for hydrodynamic bearing forces, which considers the turbulence effect, is proposed using the method of separation...

... Reynolds number lubrication. The incompressible continuity equation and Navier-Stokes equations, including inertia terms, are simplified using an averaged velocity approach to obtain an extended form of short bearing Reynolds equation which applies to both laminar and turbulent flows. A full kinematic...

...E. Rajasekhar Nicodemus; Satish C. Sharma The objective of the present paper is to study analytically the influence of wear on the performance of a capillary-compensated, four-pocket, hybrid journal bearing system operating in a turbulent regime by considering various geometric shapes of recess...

...Noël Brunetière; Bernard Tournerie The aim of this paper is to present a turbulence model that allows turbulent flows between smooth and/or rough walls to be dealt with. After analyzing available literature data, an improvement of the Elrod, Ng, and Pan turbulence model is proposed, taking...

... bearing, this bearing can have radial adjustments. The tilt adjustments are obtained by providing flexibility to the pad at one corner. This paper deals with the effect of turbulence on the steady state performance characteristics of a centrally loaded 120 deg single pad externally adjustable fluid film...

...Noël Brunetière; Bernard Tournerie The aim of this paper is to present a numerical model to compute laminar, turbulent, and transitional incompressible fluid flows in thin lubricant films where inertia effects cannot be neglected. For this purpose, an averaged inertia method is used. A numerical...

.... It was found that the airflow just after entering the bearing clearance becomes turbulent in a region where relatively rapid pressure recovery occurs and that no shock wave is generated at the boundary between subsonic and supersonic flow. In addition, the numerical results presented show good agreement...

...Zhaogao Luan; M. M. Khonsari Turbulent flow inside the seal chamber of a pump operating at high Reynolds number is investigated. The K − ε turbulence model posed in cylindrical coordinates was applied for this purpose. Simulations are performed using the fractional approach method. The results...

... ) and, on the other hand, the pressure field determined using the present model. The experimental configuration consists of an outer pressurized turbulent flow between two stationary flat disks. The present model slightly underestimates the pressure drop, the more so for decreasing radii. This is due to the higher...

...David L. Rhode, Professor; Richard G. Adams A fully compressible , two-dimensional axisymmetric, turbulent Navier-Stokes code using the finite-volume discretization approach was utilized to obtain an enhanced understanding of the effects of rub-grooves in straight-through , abradable labyrinth...

... induces a progressively turbulent radial flow. In this case, it is shown that neither thermal effects nor fluid flow regime significantly affect seal behavior. Contributed by the Tribology Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for presentation at the STLE/ASME Tribology...

... for Cryogenic Applications ,” AIAA Journal of Propulsion and Power , 11 , pp. 964 – 972 . Yang , Z. , San Andre´s , L. , and Childs , D. , 1995 , “ Thermohydrodynamic Analysis of Process Liquid Hydrostatic Bearings in Turbulent Regime ,” ASME J. Appl. Mech. , 62 , pp. 674 – 684...

...Mathieu Helene; Mihai Arghir; Jean Frene The present work investigates the flow in the feeding recess of a hybrid journal bearing. Numerical integration of the complete Navier-Stokes equations was performed with an appropriate turbulence model. Of primary concern is the pressure field...

... equations where only one recess is modeled (with the film lands and the supply region), the fluid being regarded as incompressible and isothermal. Both the laminar and the turbulent flow regimes are considered. The study is governed by two parameters, one related to the HJB operating conditions...

... 03 May 2001 6 Mass flow rates through bearing inner and outer radii and recess flow rate versus shaft collar static misalignment angle − ϕ X R out / C machine bearings rotors turbulence flow tribology Cryogenic turbo pumps and environmentally...

... between theory and experiment is shown for Re < 100 , but a significant discrepancy (most likely due to turbulence) is observed for 300 < Re < 1500 . rough surfaces grinding fluid mechanics flow turbulence lubrication mechanical contact friction The literature on fluid flow...

... and turbulent regimes using the classical Reynolds equation of lubrication and a modified Reynolds equation for turbulent flows, respectively. The applicability of the proposed models is discussed and verified experimentally in terms of the developed hydrodynamic pressure. It is found that the classical...

...Chao Zhang; Zixia Yi; Zhiming Zhang Theoretical and experimental THD analyses of high speed heavily loaded journal bearings are presented. Numerical solutions include thermal deformation, mass conserving cavitation and turbulent effects. The pressure and temperature distributions, the eccentricity...