Free-piston IC engine - supplies gas to gas turbine for driving locomotive

摘要

The gas turbine has two free internally cooled pistons guided coaxially one end in a tube and symmetrically controlled and with lubricated sliding surfaces. A cylinder as a carried shaft has an end guide bush formed with the shaft and a bush the far end for the combustion chamber injection pump. A radial gas turbine coaxially seated on the cylinder uses spent combustion gas and forms compressors on both sides for heated cooling air from cylinder and piston to feed to the combustion chamber. Controls regulate piston stroke, compression, injection volume and timing by ring magnets to ignite fuel for constant volume combustion. The two pistons (17,39) should be hollow and each comprises a tube-guided (73,84) coaxial buffer piston (74,82) and an axial working pistons (18,76) at each end face . The tubes converge and diverge symmetrically along their axis (X) in the end bushings (13,43) and with the pistons divide the cylinder into additional combustion spaces (21,37) between main chamber (33) and buffer pistons so the pistons close off transfer flow slots (19,38) as they move to their inner dead centre, thus building up air cushions which brake the first free piston departing from its symmetrical run. Fresh air (5a) enters through slots (2,47) into the bushings and via the guide tubes into the pistons. It is diverted by coaxial guide tubes (77,78) at the work piston ends into the cooling air slots (75,79) and thence via the additional combustion spaces. USE/ADVANTAGE - Locomotive etc free piston engines. Turbine runs at max thermal efficiency and can use different fuels.