Abstract
Orifice restriction is a traditional form of throttle used in aerostatic guide way. Practically, self-excited vibration or even air hammer phenomenon will appear in gas film interior when supply gas enlarges or the film thickness decreases to micron scale. In order to analyze the process from the pressure inlet to the entrance of completely developed laminar flow, Reynolds Equation coupled with the first order velocity slip is used. Since it has rarefied property, turbulence model and molecular dynamics theory are adopted based on molecular collision theory. This paper reveals the internal cyclone law in gas chamber and the relationship between essence of the shock formation and the gas molecule velocity excitation. Further study shows that, supply pressure, film parameters and chamber parameters have important influences on cyclone phenomenon and shock wave.
Highlights
Orifice restriction is a traditional type of throttle in aerostatic guide way
G.Belfforte derived gas flow coefficient of orifice compensated thrust bearing by experiments. He derived empirical formula for calculation of gas consumption and pressure distribution with a view to Reynolds number analysis and the two throttling action in 2006[2].One important phenomenon that orifice throttling is different from the inherent throttling is that the gas chamber structure will form a cyclone
Carfagno S P found that through experiment: in area between the gas supply hole and the pressure gas film, the radial pressure distribution curve had a sudden drop according to laminar assumption[3].The phenomenon of gas film fluctuation in the air static pressure guide rail was studied by AOYAMA
Summary
Orifice restriction is a traditional type of throttle in aerostatic guide way. Lots of research reports on orifice compensated air bearing at home and abroad are available. G.Belfforte derived gas flow coefficient of orifice compensated thrust bearing by experiments. He derived empirical formula for calculation of gas consumption and pressure distribution with a view to Reynolds number analysis and the two throttling action in 2006[2].One important phenomenon that orifice throttling is different from the inherent throttling is that the gas chamber structure will form a cyclone. Gas velocity is changed to subsonic after shock wave These documents had no complete description of the orifice throttling process. Given fundamental equations of gas flow (momentum equation, continuity equation and state equation in Cartesian coordinate system), velocity slip boundary condition was taken into account: z=0, u U l ' wu ,v l ' wZ ,Z 0. U is the relative velocity of the slide plate and the guide rail. u , v , Z is the velocity
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