or air cooling the rotor for this purpose the ejector which connects to the internal cavity of the rotor and waste gate channel is installed thus without special expenses of energy due to energy of thrown out exhaust gases flow of the air oil mixture or air and respectively cooling of the internal surface of the rotor is carried out for reduction of oil losses devices for separation oil from air and for the oil return to the lubrication system and or to system of oil cooling of the rotor are installed in the power plant 39 s hollow elements as oil separation devices for example standard centrifugal separators of oil can be used devices for separation of oil can combine functions of separation and improvement the heat transfer from oil to the walls of the power plant hollow elements in fig3 is shown the simplest version of such device in the horizontal tube 20 are mounted round disks three of which 21 22 23 are shown in fig3 in the disks are cut out in turn the first disks 21 23 and second disk 22 quadrants and the groove 24 are cut through in the disks bottom the air oil mixture from the internal cavity of the rotor is supplied into the tube 20 movement of the air oil mixture in fig3 shows with white arrows during flow through the cut out parts of disks the flow direction of the mixture changes and oil separates the oil then flows down to the bottom of the tube and through the grooves 24 and the bottom of the tube drain downs in the oil tank located below the tube.