Study of Hydrodnamic Pumping Effects of Fixed Axis Rotation in Eccentric Annular Flow Field

Hydrodynamic effect is one of the key phenomena in journal bearing lubrication. Many researches have been carried out on supporting force bearing, motion suspension shaft and lubrication effect. This paper studies hydrodynamic from another point view, that is, pumping caused by rotation eccentric with fixed axis. The clearance between rotor stator divided into two sections inlet port outlet port. Their mathematical models are established studied polar coordinates. pressure distribution flowrate flow field theoretically. Under conditions analyzed this paper, an output larger than 90 ml/s could be generated, overcoming a load 0.5 MPa. In addition, mechanism affected orientation. According to analysis results angle range π/8 3π/4, when pump set near 3π/8 π/2, reaches maximum value 91.83 ml/s, nearly half 48% inflow liquid can pumped outlet.