Analysis of Surface Roughness Effects on the Performance of a Gas Turbine Stage

Authors

Abstract

Today, gas turbines are considered as one of the most important equipment in energy industry and with a lot of applications in other industries. So far, very few CFD studies on the effect of roughness on turbine performance have been performed. This paper presents numerical study of roughness which affects performance of a single stage axial flow turbine. Numerical calculations have been performed using an in-house developed software in the C++ environment employing Roe scheme to solve governing equations in generalized coordinates. In order to simulate the turbulent flow the Baldwin-Lomax model and for simulating the roughness the Cebeci-Chang model is used. To realize the roughness effects in a turbine stage, several roughness heights in transitionally rough and fully rough flow regimes on the stator and rotor blades have been simulated. Results show that the efficiency is reduced with increasing roughness height. Also, with increasing the surface roughness of the stator and rotor, deviation angle will increase and thus the work coefficient will reduce. Moreover, the loss coefficient in both stator and rotor blades is increased especially, suction surfaces are faced with more losses.

Keywords

Main Subjects

References

[1] Giampaolo A (2006) Gas Turbine Handbook: Principles and Practices. 3nd edn. The Fairmont Press.
[2] Yun Y, Park Y, Song SJ (2005) Performance Degradation Due to Blade Surface Roughness in a Single-Stage Axial Turbine. ASME J Turbomach.  137-143.
[3] Bammert K, Sandstede H (1972) Measurements Concerning the Influence of Surface Roughness and Profile Changes on the Performance of Gas. ASME J Engineering for Power. 207-213.
[4] Kind RJ, Serjac PJ, Abbott MWP (1998) Measurements and Prediction of the Effects of Surface Roughness on Profile Losses and Deviation in a Turbine. ASME J Turbomach. 20-27.
[5] Morini M, Pinelli M, Spina PR, Venturini M (2009) CFD Simulation of Fouling on Axial Compressor Stages. ASME TURBO EXPO.
[6]  Morini M, Pinelli M, Spina PR, Venturini M (2010) Numerical Analysis of the Effects of Non-Uniform Surface Roughness on Compressor Stage Performane. ASME TURBO EXPO.
[7] Morini M, Pinelli M, Spina PR, Venturini M (2010) Influence of Blade Deterioration on Compressor and Turbine. ASME J Engineering for Gas Turbines and Power.
[8]  Kang YS, Yoo JC, Kang SH (2006) Numerical Predictions of Roughness Effects on the Performance Degradation of an Axial-Turbine Stage. KSME J Mechanical Science and Technology. 1077-1088.
[9]  Boyle RJ, Senyitko RG (2003) Measurements and Predictions of Surface Roughness Effects on Turbine Vane Aerodynamics. ASME TURBO EXPO.
[10] Hoffmann AK, Chiang ST (2000) Computational Fluid Dynamics. Vol 1-2-3, 4nd edn, Engineering Education System Publication, USA.
[11] Kermani MJ, Plett E.G (2001) Roe Scheme in Generalized Coordinate. part I- Formulations. AIAA J.
[12] Kermani MJ, Plett E.G (2001) Roe Scheme in Generalized Coordinates, part II- Application to Inviscid and viscous flows. AIAA J.
[13] Blazek J (2001) Computational Fluid Dynamics: Principles and Applications. Elsevier Science Ltd, UK.
[14] Kermani MJ, Plett E.G (2001)  Modified Entropy Correction Formula for the Roe Scheme Roe. AIAA J.
[15] Visbal M, Knight D (1984) the Baldwin-Lomax Turbulence Model for Tow-Dimensional Shock-Wave/Boundary Layer Interactions. AIAA J. 921-921.
[16] Shin J, Chen HH, Cebeci T (1992) A Turbulence Model for Iced Airfoils and Its Vaidation. AIAA 30th Aerospace Sciences Meeting.
[17] Back SC, Sohn JH, Song SJ (2010) Impact of Surface Roughness on Compressor Cascade Performance. ASME J Fluids Engineering.
[18] Schlichting H (1979) Boundary Layer Theory. McGraw-Hill Ins. 7th edn, New York.
[19] Lakshminarayana B (1996) Fluid Dynamics and Heat Transfer of Turbomachinery Wiley Interscience Publication, USA.
[20] Dahlquist AN (2008) Investigation of losses prediction methods in 1D for axial gas turbines. MSc thesis. Faculty of Engineering LTH Lund University. Sweden.
[21] Kang SH, Kang YS, Han KH (2003) Numerical Study on Blade Roughness Effect on the Performance of Turbomachines. IGTC.
[22] Guo J, Julien PY (2007) Buffer Law and Transient Roughness Effect in Turbulent Open-Channe. ISEH.
Journal of Solid and Fluid Mechanics
Volume 6, Issue 2
July and August 2016
Pages 197-212

Files

Share

How to cite

Statistics