Effects of angular misalignment on the performance of rotor-bearing systems supported by externally pressurized air bearing

Dal, Abdurrahim; Karaçay, Tuncay

doi:10.1016/j.triboint.2017.03.018

Cited by 51 publications

(33 citation statements)

References 21 publications

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“…The pressure field in the gas film is described with the Reynolds equation as follows 25,38 where p is pressure, ϕ and z are the computational axes, u and w are the circumferential velocity and axial velocity of the piston, m·in is the mass flow rate 37 at the orifice inlet described by equation (3) below, δi=1 with orifice and δi=0 without the orifice. ℜ is ideal gas constant, T is the atmospheric temperature, and h is the gap thickness 39 expressed in equation (4).…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…The gas film thickness considering the misalignment angles is given below 25,39 where ɛ is eccentricity ratio of the piston, θ is the dimensionless circumferential coordinate axis, ϕ0 is the attitude angle of the piston, c is radial gap of the bearing, L is bearing length, ϕx and ϕy are the misalignment angles of the piston.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…By defining the dimensionless parameters (similar to the parameters definition in literature 25,40 ) the dimensionless form of equation (2) can be written in equation (6) which is similar to the expression in literature 25,40 where p a is atmospheric pressure, P is dimensionless pressure, Z is the dimensionless coordinate axis in the axial direction, H is dimensionless film gap, R is piston radius, ρa is density of air at atmospheric conditions, Δθ and ΔZ are the discretized cell size in θ and Z directions, Λt is the bearing time constant, and Λm is the mass flow number of orifices in the bearing.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…The finite volume method (FVM) 14–21 and finite difference method (FDM) 13,22–29 are widely employed as the numerical methods for solving the partial differential equations in aerostatic bearing publications. The FVM has many advantages compared with FDM for either two-dimensional or three-dimensional fluid flow.…”

Section: Introductionmentioning

confidence: 99%

“…Although FVM is more suitable for bearing problems in general, the FDM is usually applied for the discretization of the Reynolds equation, as found in the literature, when the mesh is two-dimensional and structured. 13,23–30 FDM is employed to discretize the partial differential terms of the Reynolds equation in this work.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on backflow phenomenon in the aerostatic journal bearing

Chen

Bao

Mills

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this work, the backflow phenomenon exhibited in the gas journal bearings is investigated. The effect of operational parameters such as eccentricity ratio ɛ, axial velocity of the bearing vz, misalignment angles [Formula: see text] and [Formula: see text] on the backflow behavior, and load force and axial friction force of the bearing are studied numerically. The differential transformation method and finite difference method are utilized to solve the dimensionless Reynolds equations required in the analysis. The performance parameters such as pressure distribution, gas flow rate, load force, and axial friction force are examined in the numerical simulations. The investigation reveals that when the bearing is operated in normal working zone, the load force F increases significantly with an increase in eccentricity ɛ; however, F may only increase slightly when the bearing operates in the backflow zone. It is suggested that the pressure Ps should be set greater than 5.0, Pc smaller than or equal to 3.0 to avoid the backflow behavior. The axial friction force [Formula: see text] is largely determined by the pressure [Formula: see text], and increases as pressure Pc increases.

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