COMPUTATIONAL STUDY OF TURBINE CASCADE

Abstract

Roughness over the turbine blade is mainly caused by erosion corrosion and deposition. The roughness varies along the blade height and also over different stage of blade. To see the effect of roughness, three profiles have been taken and were checked for different roughness over only pressure surface, only suction surface and over both the surfaces together. The study has been carried out using Fluent software. It has been concluded that the loss coefficient increases with roughness. Roughness over pressure surface is more detrimental than suction surface. Study also reveals that roughness over reaction profile is more detrimental than that of impulse profile.