Abstract
AbstractThis paper presents a theoretical model of the three‐dimensional flow of an incompressible gas in a concentric double‐plane admission externally pressurised gas journal bearing. Inertia effects and the discreteness of the feed holes are included. The flow map demonstrates the formation of a vena contracta at the commencement of the film, downstream of the feed holes, as well as detailed behaviour of the streaklines within the film. The pressure profile obtained shows a depression at the vena contracta, followed by a partial recovery which varies around the feed holes, depending on whether the local flow is exiting between the rows of holes or outboard towards atmosphere. A comparison is also made with a similar one‐dimensional incompressible flow solution to obtain flow and pressure factors, to account for the discreteness of the feed holes as well as inertia effects.
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