Computational investigation of the effect of axial clearance value on the turbine stage parameters
The paper presents the investigation results of influence of the axial clearance value on the efficiency of three uncooled turbine stages. Possibility to apply the stationary approach to simulation of the work process was evaluated. The results of the study show that the change in the stage parameters with increasing axial clearance corresponds to the known ideas about the aerodynamic characteristics of turbomachine lattices in the area of the far wake behind the nozzle blades. In the case of the axial clearances corresponding to the near wake of the nozzle blades, application of the stationary modeling approach leads to inconsistent results and cannot be recommended for practical application.