EFFECT OF PARTICLE DEPOSITION ON THE PERFORMANCE OF TURBINE BLADES

The work considered here represents the first part for the study of the effect of deposition on the performance of turbine blades. In this part, a turbine cascade was selected from the literature. The compressible, non-isothermal flow field is solved and tested. The Lagrangian particle moving model is used to simulate particle dispersion through the cascade. The sticking model is developed, implemented and tested with experimental data. Particle detachment from the surface is simulated by applying the critical moment theory on the particle at the surface. The critical wall shear velocity required for particle detachment is calculated. CASCADE SELECTION Experimental data on particle deposition on turbine blades are almost nonexistent except for the results of Parker and Lee (1972). Parker and Lee performed their deposition experiments using adhesive tape on the blade surface. Therefore, their data can be used only to verify the moving model but could not be used to verify particle sticking and detachment calculations. El-Batsh and Haselbacher (2000) used these data to investigat