Determination of Rotor Surfacing Time for the Vertical Microturbine with Axial Gas-Dynamic Bearings

The rotor surfacing time of a vertical microturbine with the axial gas-dynamic bearings is estimated in this article. The problem of providing low coefficient of friction in vertical turbomachines can be solved by using various types of bearings. The earlier research showed the efficiency of the gas-dynamic bearings at nominal regimes of vertical power installations. However, the rotor does not immediately pop up in the axial gas-dynamic bearing. At the initial speed of the rotor, i.e., in the start mode, the active friction of the shaft and the bearing-rotor petals occurs. Thus, the article presents an estimation of the rotor surfacing time in locally produced gas-dynamic lobe bearings made by means of mathematical modeling method.