Loss reduction by means of three dimensional roughness elements on the suction surface of a linear turbine rotor cascade

摘要

The present paper reports results of experiments carried out on a 120 deg deflection impulse turbine cascade. Four sets of experiments are carried out, viz. smooth configuration and three configurations with a 20 mm wide emergy sheet of grades 400, 320 ad 220 (configurations 3DI, 3DII and 3DIII) centrally fixed at 65