Present State and Perspectives for Further Development of Aircraft Turbine Engines,

Current progress in the field of turbine engines for aircraft, as exemplified by the introduction of new engine types, improvement of existing engines in terms of flow and structure, the use of new control techniques and materials, and the increase of reliability is discussed. Significant new developments in turbine engines are the small sized lift engines having a very large ratio of thrust to weight, and the by-pass lift-thrust engines with rotating inlet nozzles. Engine improvements in terms of flow are examined from the viewpoint of studies conducted with new methods of designing compressors, combustion chambers, and turbines. Both the use of moving stator blades and the cooling of rotor blades by transpiration are reviewed. Problems involved with bearings for the main shafts are analyzed and methods for reducing vibration are examined. New methods of engine control during operation are based on the utilization of such control parameters as temperature and pressure at the inlet, temperature behind the turbine, rotational velocities of the revolving elements, the position of the rotational velocities of the revolving elements, the position of the rotational-velocity selector, and combinations thereof. The use of reinforced composite materials is reviewed its advantages, e.g., improving the weight-to-thrust ratio, are outlined. Author