Flow investigation for single stage turbine cascade using finite difference numerical technique

Abstract

In this study, the rotor and the stator for a axial turbine has been investigated using a computational technique. The method adopts a stream function vorticity approach and uses an Alternate Direction Implicit Technique to march vorticity, and a successive over-relaxation technique to obtain the stream function level. Flow assumed as steady, incompressible and viscid which adopted to 2-dimensional geometry. Initial calculations are presented the cascade blades for Reynolds numbers at 100, 1000 and 10000. Numerical results presented as stream function and 2-D velocities. The results show that the flow through a diffusing, at single stage turbine cascade is strongly influenced by circumferential velocity. This effect is clearly discernable at the beginning of the time for the turbine cascade and decrease step by step. The passage wake and the blade trace effect have been observed within the turbine blades but it is increased the wake size. The secondary flow occurred at the leading edge of the rotor side. Presented data also explained that how strong generate the vortices within the turbine blades which estimated to be beneficial for CFD study when turbulence investigation needs to the turbine cascades.