Numerical modeling of the mechanism of coarse droplets deposition on surfaces of a steam turbine nozzle blade cascade

Abstract

The numerical model describing the interaction of coarse droplets with the surfaces of inter-blade channels is presented. This method uses a statistical approach to simulate the splashing process of primary droplet after its collision with the wall. This technique was verified by experimental investigation of wet steam flow in the studied nozzle blade cascade using the flow laser diagnostics system and PTV method. Numerical studies of wet steam were performed in order to investigate the structure of liquid particles streams and liquid film formation conditions in the nozzle blade passage. The influence of primary droplets inlet angle and steam density on the liquid phase parameters has been considered.