Analysis on the Gas Pressure Distribution of Conical Spiral Groove Aerodynamic Bearings

The conical spiral groove aerodynamic bearings lubricated with compressible gas have been investigated theoretically for their merit of infinitesimal friction,high rotary speed,high rotary precision,less wear abrasion,and so on.Because of the special structure of conical bearings and existence of spiral groove,conformal mapping and oblique coordinate transformation have been processed for calculated regions of the governing equations.By employing the regional integral finite difference method,the finite difference formulas of the governing equations in longitudinal and transverse orientation have been deduced in oblique coordinate.The paper focusses on the numerical analysis for pressure distribution of the bearing,and on the discussion to the computed result.The results show that the spiral grooves can realize hydrodynamic effect of gas bearings,and pressure distribution assumes sawtooth shape in peripheral orientation.The rotate speed and trough deep rate has different effects on gas interspace pressure of bearings.