FLOW AROUND THE SECTIONS OF ROTOR BLADING OF A TURBINE STAGE WITH RELATIVELY LONG BLADES AT OFF-DESIGN CONDITIONS

The paper deals with the results of aerodynamic research of flow throu gh blade cascades at off-design conditions. Variations of inlet veloci ty vectors during the operation of the stage at off-design how conditi ons are calculated and compared with experimental results. The detaile d measurements provide data on aerodynamic parameters, kinetic energy losses and flow structure. Leading edge flow separation occurs mainly at off-design incidences and is proved to be the reason for the consid erable kinetic energy loss increase. The occurrence of unsteady aerody namic phenomena and forces at off-design performance of blade cascades is shown. The transonic how structure is studied in detail and experi mental data analysis and results of numerical calculations are present ed.