OJFD  Vol.3 No.4 , December 2013
Numerical Analysis of the Losses in Unsteady Flow through Turbine Stage
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.

Cite this paper
S. Dykas, W. Wróblewski and D. Machalica, "Numerical Analysis of the Losses in Unsteady Flow through Turbine Stage," Open Journal of Fluid Dynamics, Vol. 3 No. 4, 2013, pp. 252-260. doi: 10.4236/ojfd.2013.34031.
References
[1]   J. D. Denton, “Loss Mechanisms in Turbomachines,” Journal of Turbomachinery, Vol. 115, No. 4, 1993, pp. 621-656. http://dx.doi.org/10.1115/1.2929299

[2]   N. Wei, “Significance of Loss Models in Aerothermodynamic Simulation for Axial Turbines,” Doctoral Thesis, Royal Institute of Technology.

[3]   S. Dykas, W. Wróblewski and H. Lukowicz, “Prediction of Losses in the Flow through the Last Stage of Low-Pressure Steam Turbine,” International Journal for Numerical Methods in Fluids, Vol. 53, No. 6, 2007, pp. 933-945. http://dx.doi.org/10.1002/fld.1313

[4]   P. Lampart, “Investigation of Endwall Flows and Losses in Axial Turbines, Part I. Formation of Endwall Flows and Losses,” Journal of Theoretical and Applied Mechanics, Vol. 47, No. 2, 2009, pp. 321-342.

[5]   W. Wróblewski, A. Gardzilewicz, A. Dykas and P. Kolovratnik, “Numerical and Experimental Investigation of Steam Condensation in LP Part of Large Power Turbine,” Journal of Fluids Engineering, Trans, ASME, Vol. 131, No. 4, 2009, pp. 1-11.

[6]   T. P. Moffit, E. M. Szanca and W. J. Whitney, “Design and Cold-Air Test of Single-Stage Uncooled Core Turbine With High Work Output,” NASA Report TP-1680, 1980.

[7]   F. R. Menter, “Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications,” AIAA Journal, Vol. 32, No. 8, 1994, pp. 1598-1605. http://dx.doi.org/10.2514/3.12149

 
 
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