TITLE:
Numerical Analysis of the Losses in Unsteady Flow through Turbine Stage
AUTHORS:
Sławomir Dykas, Włodzimierz Wróblewski, Dawid Machalica
KEYWORDS:
Turbine Stage; Stator; Rotor; Loss Coefficients
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.3 No.4,
December
4,
2013
ABSTRACT: This paper presents an analysis of the operation of a stage of an aircraft engine gas turbine in terms of generation of flow losses. The energy loss coefficient, the entropy loss coefficient and an additional pressure loss coefficient were adopted to describe the losses quantitatively. Distributions of loss coefficients were presented along the height of the blade channel. All coefficients were determined based on the data from the unsteady flow field and analyzed for different mutual positioning of the stator and rotor blades. The flow calculations were performed using the Ansys CFX commercial software package. The analyses presented in this paper were carried out using the URANS (Unsteady Reynolds-Averaged Navier-Stokes) method and two different turbulence models: the common Shear Stress Transport (SST) model and the Adaptive-Scale Simulation (SAS) turbulence model, which belongs to the group of hybrid models.