A numerical method for solution of the discharge coefficients in externally pressurized gas bearings with inherent orifice restrictors. (September 2018)

• Record Type: Journal Article
• Authors: Zhang, Jianbo; Zou, Donglin; Ta, Na; Rao, Zhushi; Ding, Boyao
• Is Part Of: Tribology international. Volume 125(2018)
• Page Start: 156
• Page End: 168
• Publication Date: 2018-09
• Subjects: Aerostatic bearing -- Discharge coefficient -- Reynolds equation; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2018.03.032
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: To study the discharge coefficients of aerostatic bearings, a new numerical method which combines the method of "separation of variables" for solution of laminar boundary-layer equations and analytical solution of Reynolds equation is proposed. The discharge coefficients are suitable for solution of Reynolds equation. The influences of flow and geometry parameters on discharge coefficients are investigated and the results indicate that there exists parameters insensitive and sensitive regions in discharge coefficient analysis. Further research shows that flow and geometry parameters affect discharge coefficient by influencing the pressure ratio ( p r / p s ) and discharge coefficient tends to be constant when pressure ratio is approximately less than 0.6, which is the reason that there exists the parameters insensitive and sensitive regions. Highlights: A method combining laminar boundary-layer equations with Reynolds equation is proposed to study discharge coefficient. The method is applicable for aerostatic bearing with inherent orifice. The depression region phenomenon is studied and the inertial and viscous effect is the reason of the phenomenon. The influences of flow and geometry parameters on discharge coefficients are investigated. There exist sensitive and insensitive parameter regions in effect of flow and geometry parameters on discharge coefficient.