Theoretical and Experimental Pressure Distribution in Supersonic Domain for an Inherently Compensated Circular Thrust Bearing

1973 ◽  
Vol 95 (2) ◽  
pp. 217-220 ◽  
Author(s):  
M. Poupard ◽  
G. Drouin
Keyword(s):  
Pressure Distribution ◽  
Friction Factor ◽  
Thrust Bearing ◽  
Experimental Pressure

The authors present an equation describing the pressure distribution in the supersonic domain, for a lightly loaded bearing, including a friction factor as an explicit term. This paper contains also a few experimental curves showing the effect of rounding the edge of an inherently compensated orifice.

The Numerical Analysis of the Velocity and Pressure Distribution of the Oil Film in Heavy Hydrostatic Thrust Bearing

2014 ◽  
Vol 541-542 ◽  
pp. 658-662
Author(s):  
Jian Li ◽  
Yuan Chen ◽  
Yang Chun Yu ◽  
Zhu Xin Tian ◽  
Yu Huang
Keyword(s):  
Mathematical Model ◽  
Numerical Analysis ◽  
Pressure Distribution ◽  
Working Conditions ◽  
Thrust Bearing ◽  
Rotation Speed ◽  
The Other ◽  
Surface Load ◽  
Oil Film ◽  
Volume Method

To study the velocity and pressure distribution of the oil film in a heavy hydrostatic thrust bearing, a mathematical model of the velocity is proposed and the finite volume method (FVM) has been used to simulate the flow field under different working conditions. Some pressure experiments were carried out and the results verified the correctness of the simulation. It is concluded that the pressure distribution varies small under different rotation speed when the surface load on the workbench is constant. But the velocity of the oil film is influenced greatly by the rotation speed. When the rotation speed of the workbench is as quick as enough, the velocity of the oil film on one radial side of the pad will be zero, that is to say the lubrication oil will be drained from the other three sides of the recess.

Centrifugal Effects in Hydrostatic Porous Thrust Bearing

1979 ◽  
Vol 101 (3) ◽  
pp. 381-385 ◽  
Author(s):  
R. S. Gupta ◽  
V. K. Kapur
Keyword(s):  
Pressure Distribution ◽  
Thrust Bearing ◽  
Load Capacity ◽  
Bearing Material

In this analysis the customary neglected centrifugal effects on the performance of hydrostatic porous thrust bearing with incompressible lubricant has been studied and the effects of their interaction of pressure distribution and load capacity illustrate the possibility of replacement of the nonporous bearing material by porous one.

Elastohydrostatic Lubrication of Circular Plate Thrust Bearings

1967 ◽  
Vol 89 (3) ◽  
pp. 237-242 ◽  
Author(s):  
D. Dowson ◽  
C. M. Taylor
Keyword(s):  
Pressure Distribution ◽  
Circular Plate ◽  
Thrust Bearing ◽  
Elastohydrodynamic Lubrication ◽  
Radial Pressure ◽  
Simplified Approach ◽  
Thrust Bearings ◽  
Low Modulus ◽  
Elastic Distortion ◽  
Equivalent Modulus

The subject of elastohydrodynamic lubrication has developed considerably in recent years and in the present paper the influence of elastic distortion upon the performance of a hydrostatic thrust bearing is considered. A circular plate hydrostatic thrust bearing is considered and one of the pads is assumed to be lined by a thin layer of elastic material. A simplified approach to the calculation of elastic displacements is used and an approximate analytical solution of the governing elastohydrostatic equations is presented. Theoretical solutions showing the influence of elastic distortion upon pressure distribution are presented. Experimental measurements of radial pressure distribution are recorded for bearings lined with low modulus nitrile and polyurethane rubber. Difficulties encountered in the measurement of the rubber properties prevented a strict comparison between experimental and theoretical results but the selection of an equivalent modulus enabled qualitative agreement to be demonstrated. Elastohydrostatic behavior is shown to have a beneficial effect upon bearing performance.

Effect of Solid Particles on Turbine Performance

1976 ◽  
Vol 98 (1) ◽  
pp. 47-52 ◽  
Author(s):  
W. Tabakoff ◽  
W. Hosny ◽  
A. Hamed
Keyword(s):  
Pressure Distribution ◽  
Gas Flow ◽  
Theoretical Method ◽  
Solid Particles ◽  
Injection System ◽  
Particle Injection ◽  
Turbine Efficiency ◽  
Turbine Performance ◽  
Experimental Pressure ◽  
Good Agreement

A theoretical method was developed for predicting the pressure distribution over a blade in cascade for a compressible flow with solid particles. Experimental results were obtained from a cascade wind tunnel equipped with a solid particle injection system. Good agreement was noted between the theoretical and experimental pressure distribution. The change in pressure due to the particles gives reduction in the force on the blades. The presence of solid particles in air-breathing engine gas flow changes the turbine performance. The overall turbine efficiency decreases as a result of the introduction of solid particles. The performance experiment was performed on a two-stage velocity-compounded turbine.

Performance characteristics of rectangular aerostatic thrust bearing by conformal mapping

2018 ◽  
Vol 70 (8) ◽  
pp. 1457-1475
Author(s):  
Shang-Han Gao ◽  
Sheng-Long Nong
Keyword(s):  
Conformal Mapping ◽  
Pressure Distribution ◽  
Carrying Capacity ◽  
Thrust Bearing ◽  
Performance Characteristics ◽  
Load Carrying Capacity ◽  
Möbius Transform ◽  
Content Type ◽  
Air Supply ◽  
Load Carrying

Purpose This paper aims to analyze the pressure distribution of rectangular aerostatic thrust bearing with a single air supply inlet using the complex potential theory and conformal mapping. Design/methodology/approach The Möbius transform is used to map the interior of a rectangle onto the interior of a unit circle, from which the pressure distribution and load carrying capacity are obtained. The calculation results are verified by finite difference method. Findings The constructed Möbius formula is very effective for the performance characteristics researches for the rectangular thrust bearing with a single air supply inlet. In addition, it is also noted that to obtain the optimized load carrying capacity, the square thrust bearing can be adopted. Originality/value The Möbius transform is found suitable to describe the pressure distribution of the rectangular thrust bearing with a single air supply inlet.

Local Pressure Measurement of Gaseous Flow Through Microchannels

1999 ◽  
Author(s):  
Stephen E. Turner ◽  
Hongwei Sun ◽  
Mohammad Faghri ◽  
Otto J. Gregory
Keyword(s):  
Reynolds Number ◽  
Pressure Distribution ◽  
Friction Factor ◽  
Knudsen Number ◽  
Flow Region ◽  
Reynolds Numbers ◽  
Helium Flow ◽  
Local Pressure ◽  
Pressure Losses ◽  
Flow Through

Abstract This paper presents an experimental investigation on nitrogen and helium flow in microchannels etched in silicon with hydraulic diameters of 9.7, 19.6, and 46.6 μm, and Reynolds numbers ranging from 0. 2 to 1000. The objectives of this research are (1) to measure the pressure distribution along the length of a microchannel; and (2) to determine the friction factor within the fully developed region of the microchannel. The pressure distribution is presented as absolute local pressure plotted against the distance from the microchannel inlet. The friction factor results are presented as the product of friction factor and Reynolds number plotted against Reynolds number with the outlet Knudsen number, Kn, as a curve parameter. The following conclusions have been reached in the present investigation: (1) Pressure losses at the microchannel entrance can be significant; (2) the product, f*Re, when measured sufficiently far away from the entrance and exit is a constant in the laminar flow region; and (3) the friction factor decreases as the Knudsen number increases.

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