RESEARCH ON THE TIP SECTIONS OF A LONG TURBINE BLADE

摘要

This paper reports on the results of high-speed aerodynamic research on a blade cascade. The blade cascade represents the tip section of the last stage rotor blades of a large output steam turbine. The aerodynamic characteristics of the biade cascade are presented together with flow field photographs in a range of transonic and supersonic velocities.Pictures of the flow field were obtained by means of interferometry and the schlieren method. The pressure distribution over the profiles was also evaluated using interferometry. Finally, the data for evaluating the losses and other integral characteristics of the flow exiting from the cascade were measured pneumatically with the use of a traversing device.The results are analyzed and discussed.