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An unsteady numerical analysis of a generic non-axisymmetric turbine endwall in a 1½ stage turbine test rig

  • D. Dunn (a1), T.W. von Backström (a1) and G. Snedden (a2)

Abstract

As concern for the environment increases, so does the desire to reduce emissions and improve fuel efficiency. One avenue being investigated in the aerospace industry is the reduction in losses in a gas turbine engine through endwall contouring, which has shown some promise in improving efficiency. The current investigation was aimed at investigating the unsteady effects downstream of a rotor with a non-axisymmetric endwall contour originally designed for a cascade.

Previous investigations (numerical and experimental) have shown that the endwall contour improved the turbine efficiency by reducing the cross passage secondary flows. The contour however had a detrimental effect on the tip flow. The current investigation found that there were negligible unsteady differences between the annular and contoured rotor, with the average comparing well to the steady state results. It was also found that the effects at the tip were due to the experimental blades untwisting during operation.

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References

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1.Brennan, G.Harvey, N.Rose, M., Fomison, N. and Taylor, M. Improving the effciency of the trent 500 hp turbine using non-axisymmetric end walls: Part 1 turbine design. In ASME TURBO EXPO 2001. ASME 2001-GT-0444, 2001.z`
2.Dunn, D.I., Snedden, G. and von Backström, T.W. Turbulence model comparisons for a low pressure 1·5 stage test turbine. In ISABE-2009-1258, 2009.
3.Dunn, D.I., Snedden, G. and von Backström, T.W. Experimental investigation into the unsteady effects of non-axisymmetric turbine endwall contouring. In SACAM2010. SACAM10-079, January 2010.
4.Dunn, D.I., Snedden, G. and von Backström, T.W. Unsteady effects of a generic non-axisymmetric endwall contour on the rotor of a 1·5 stage low speed turbine test rig. In ASME Turbo Expo 2013: Power for Land Sea and Air. GT2013-94961, June 2013.
5.Hodson, H. and Dominy, R.Three-dimensional fow in a low pressure turbine cascade at its design condition, Transaction of the ASME J Turbomachinery, 1987, 109, pp 177185.
6.Ingram, G.Endwall Profling for the Reduction of Secondary Flow in Turbines, PhD thesis, University of Durham, July 2003.
7.Japikse, D. (Ed) Advanced Topics in Turbomachinery Technology. Principal Lecture Series No.2. Concepts ETI, Inc, Norwich, Vermont 05055, USA, March 1986.
8.Marchal, P. and Sieverding, C. Secondary flows within turbomachine bladings. In Secondary fows in turbomachines, volume AGARD-CP-214 Paper 11. 1977.
9.Menter, F.R.Two-equation eddy-viscosity turbulence models for engineering applications, AIAA J, 32:269289, 1994.
10.Numeca, . User Manual FINE/Turbo v8 including Euranus) Documentation v8a. Numeca International, 5, Avenue Franklin Roosevelt, 1050 Brussels, Belgium, 8th ed, October 2007.
11.Rose, M., Harvey, N., Seaman, P., Newman, D. and McManus, D. Improving the effciency of the trent 500 hp turbine using non-axisymmetric end walls: Part 2: Experimental validation. In ASME TURBO EXPO 2001. ASME 2001-GT-0505, 2001.
12.Saravanamuttoo, H., Rogers, G. and Cohen, H.Gas Turbine Theorym, Pearson Education Limited, 5th ed, 2001.
13.Schobeiri, M.T., Abdelfattah, S. and Chibli, C.Investigating the cause of computational fuid dynamics defciencies in accurately predicting the effciency and performance of high pressure turbines: A combined experimental and numerical study, J fluids engineering, 2012, 134, (1–12).
14.Snedden, G.The Application of Non-Axisymmetric Endwall Contourning in a 1·5 stage, Rotating Turbine. PhD thesis, School of Engineering, Durham University, 2011.
15.Snedden, G., Dunn, D., Ingram, G. and Gregory-Smith, D. The performance of a generic non-axisym-metric end wall in a single stage, rotating turbine at on and off-design conditions. In ASME Turbo Expo 2010: Power for Land Sea and Air. GT2010-22006, June 2010.
16.Snedden, G., Dunn, D., Ingram, G. and von Backström, T.W. Observations on the selection of objective function for the optimisation of turbine endwalls using computational fuid dynamics. In SACAM10. South African Association for Theoretical and Applied Mechanics, January 2010.
17.Snedden, G., Dunn, D.I., Ingram, G.L. and Gregory-Smith, D.G. The application of non-axisymmetric endwall contouring in a single stage, rotating turbine. In ASME Turbo Expo, GT2009-59169, 2009.
18.Versteeg, H. and Malalasekera, W.An Introduction to Computational Fluid Dynamics, Prentice Hall, Harlow, 1995.

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