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Research Papers

Development of a Turning Mid Turbine Frame With Embedded Design—Part II: Unsteady Measurements

[+] Author and Article Information
Emil Göttlich

e-mail: emil.goettlich@tugraz.at

Franz Heitmeir

Institute for Thermal Turbomachinery and
Machine Dynamics,
Graz University of Technology,
Graz A-8010, Austria

1Currently at Whittle Laboratory, Department of Engineering, University of Cambridge.

2Currently at Dipartimento di Macchine, Sistemi Energetici e Trasporti, Universita di Genova.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 24, 2013; final manuscript received October 22, 2013; published online January 2, 2014. Editor: Ronald Bunker.

J. Turbomach 136(7), 071012 (Jan 02, 2014) (8 pages) Paper No: TURBO-13-1222; doi: 10.1115/1.4025950 History: Received September 24, 2013; Revised October 22, 2013

This paper, the second of two parts, presents a new setup for the two-stage two-spool facility located at the Institute for Thermal Turbomachinery and Machine Dynamics (ITTM) of Graz University of Technology. The rig was designed to reproduce the flow behavior of a transonic turbine followed by a counter-rotating low pressure stage such as those in high bypass aero-engines. The meridional flow path of the machine is characterized by a diffusing S-shaped duct between the two rotors. The role of wide chord vanes placed into the mid turbine frame is to lead the flow towards the low pressure (LP) rotor with appropriate swirl. Experimental and numerical investigations performed on this setup showed that the wide chord struts induce large wakes and extended secondary flows at the LP inlet flow. Moreover, large deterministic fluctuations of pressure, which may cause noise and blade vibrations, were observed downstream of the LP rotor. In order to minimize secondary vortices and to damp the unsteady interactions, the mid turbine frame was redesigned to locate two zero-lift splitters into each vane passage. While in the first part of the paper the design process of the splitters and the time-averaged flow field were presented, in this second part the measurements performed by means of a fast response probe will support the explanation of the time-resolved field. The discussion will focus on the comparison between the baseline case (without splitters) and the embedded design.

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References

Norris, G., Dominy, R. G., and Smith, A. D., 1998, “Strut Influences Within a Diffusing Annular S-Shaped Duct,” Proceedings of the ASME Turbo Expo 1998, ASME Paper No. 98-GT-425.
Marn, A., Göttlich, E., Cadrecha, D., and Pirker, H. P., 2009, “Shorten the Intermediate Turbine Duct Length by Applying an Integrated Concept,” ASME J. Turbomach., 131, p. 041014. [CrossRef]
Göttlich, E., 2011, “Research on the Aerodynamics of Intermediate Turbine Diffusers,” Prog. Aerosp. Sci., 47(4), pp. 249–279. [CrossRef]
Lengani, D., Santner, C., Spataro, R., Paradiso, B., and Göttlich, E., 2012, “Experimental Investigation of the Unsteady Flow Field Downstream of a Counter-Rotating Two-Spool Turbine Rig,” Proceedings of the ASME Turbo Expo 2012, Copenhagen, Denmark, June 11–15, ASME Paper No. GT2012-68583. [CrossRef]
Lengani, D., Santner, C., Spataro, R., and Göttlich, E., 2012, “Analysis Tools for the Unsteady Interactions in a Counter-Rotating Two-Spool Turbine Rig,” Exp. Therm. Fluid Sci., 42, pp. 248–257. [CrossRef]
Lavagnoli, S., Yasa, T., Paniagua, G., Castillon, L., and Duni, S., 2012, “Aerodynamic Analysis of an Innovative Low Pressure Vane Placed in an S-Shape Duct,” ASME J. Turbomach., 134, p. 011013. [CrossRef]
Yasa, T., Lavagnoli, S., and Paniagua, G., 2011, “Impact of a Multi-Splitter Vane Configuration on the Losses in a 1.5 Turbine Stage,” Proc. Inst. Mech. Eng., 225, pp. 964–974. [CrossRef]
Spataro, R., Göttlich, E., Lengani, D., Faustmann, C., and Heitmeir, F., 2013, “Development of a Turning Mid Turbine Frame With Embedded Design—Part I: Design and Steady Measurements,” Proceedings of the ASME Turbo Expo 2013, San Antonio, Texas, June 3–7, ASME Paper No. GT2013-95280. [CrossRef]
Hubinka, J., Santner, C., Paradiso, B., Malzacher, F., Göttlich, E., and Heitmeir, F., 2009, ``Design and Construction of a Two Shaft Test Turbine for Investigation of Mid Turbine Frame Flows,” 19th International Symposium on Airbreathing Engines, Montreal, Canada, September 7–11, ISABE Paper No. ISABE-2009-1293.
Hubinka, J., Paradiso, B., Santner, C., Göttlich, E., and Heitmeir, F., 2011, “Design and Operation of a Two Spool High Pressure Test Turbine Facility,” Proceedings of the 9th European Turbomachinery Conference, Istanbul, Turkey, March 21–25, Paper No. 112.
Kupferschmied, P., Köppel, O., Gizzi, W. P., and Gyarmathy, G., 2000, “Time Resolved Flow Measurements With Fast Aerodynamic Probes in Turbomachinery,” Meas. Sci. Technol., 11(7), pp. 1036–1054. [CrossRef]
Persico, G., Gaetani, P., and Guardone, A., 2005, “Design and Analysis of New Concept Fast-Response Pressure Probes,” Meas. Sci. Technol., 16, pp. 1741–1750. [CrossRef]
Porreca, L., Hollenstein, M., Kalfas, A. I., and Abhari, R. S., 2007, “Turbulence Measurements and Analysis in a Multistage Axial Turbine,” J. Propul. Power, 23(1), pp. 227–234. [CrossRef]
Hussain, A., and Reynolds, W., 1970, “The Mechanics of an Organized Wave in Turbulent Shear Flow,” J. Fluid Mech., 41, pp. 241–258. [CrossRef]
Peters, A., and Spakovszky, Z. S., 2012, “Rotor Interaction Noise in Counter-Rotating Propfan Propulsion Systems,” ASME J. Turbomach., 134, p. 011002. [CrossRef]
Lengani, D., Santner, C., and Göttlich, E., 2012, “Evaluation and Analysis of the Stochastic Unsteadiness in the Last Stage of a Counter-Rotating Two-Spool Turbine Rig,” Proceedings of the Conference on Modelling Fluid Flow, Budapest, Hungary, September 4–7, Paper No. 092.
Camp, T. R., and Shin, H.-W., 1995, “Turbulence Intensity and Length Scale Measurements in Multistage Compressors,” ASME J. Turbomach., 117, pp. 38–46. [CrossRef]
Oro, J. M. F., Díaz, K. M. A., Morros, C. S., and Marigorta, E. B., 2007, “On the Structure of Turbulence in a Low-Speed Axial Fan With Inlet Guide Vanes,” Exp. Therm. Fluid Sci., 32, pp. 316–331. [CrossRef]
Lengani, D., Paradiso, B., and Marn, A., 2012, “A Method for the Determination of Turbulence Intensity by Means of a Fast Response Pressure Probe and Its Application in a LP Turbine,” J. Therm. Sci., 21, pp. 21–31. [CrossRef]
Schüpbach, P., Abhari, R. S., Rose, M. G., Germain, T., Raab, I., and Gier, J., 2010, “Improving Efficiency of a High Work Turbine Using Nonaxisymmetric Endwalls—Part II: Time-Resolved Flow Physics,” ASME J. Turbomach., 132, p. 021008. [CrossRef]
Tiedemann, M., and Kost, F., 2001, “Some Aspects of Wake-Wake Interactions Regarding Turbine Stator Clocking,” ASME J. Turbomach., 123, pp. 526–533. [CrossRef]
Persico, G., Gaetani, P., and Osnaghi, C., 2009, “A Parametric Study of the Blade Row Interaction in a High Pressure Turbine Stage,” ASME J. Turbomach., 131, p. 031006. [CrossRef]
Tyler, J. M., and Sofrin, T. G., 1962, “Axial Flow Compressor Noise Studies,” SAE Trans., 70, pp. 309–332.
He, L., Chen, T., Wells, R. G., Li, Y. S., and Ning, W., 2002, “Analysis of Rotor-Rotor and Stator-Stator Interferences in Multi-Stage Turbomachines,” ASME J. Turbomach., 124, pp. 564–571. [CrossRef]
Faustmann, C., Spataro, R., Göttlich, E., Lengani, D., and Heitmeir, F., 2013, “On Noise Generation and Propagation for Different Turning Mid Turbine Setups in a Two-Stage Two-Spool Test Turbine,” Proceedings of the ASME Turbo Expo 2013, San Antonio, Texas, June 3–7, ASME Paper No. GT2013-95698. [CrossRef]
Arndt, N., 1993, “Blade Row Interaction in a Multistage Low-Pressure Turbine,” ASME J. Turbomach., 115, pp. 137–146. [CrossRef]
Lengani, D., Paradiso, B., Marn, A., and Göttlich, E., 2012, “Identification of Spinning Mode in the Unsteady Flow Field of a Low Pressure Turbine,” ASME J. Turbomach., 134, pp. 051032-1–8. [CrossRef]
Hodson, H. P., and Howell, R. J., 2005, “The Role of Transition in High Lift Low Pressure Turbines for Aero Engines,” Prog. Aerosp. Sci., 41(6), pp. 419–454. [CrossRef]
Dénos, R., Arts, T., Paniagua, G., Michelassi, V., and Martelli, F., 2001, “Investigation of the Unsteady Rotor Aerodynamics in a Transonic Turbine Stage,” ASME J. Turbomach., 123, pp. 81–89. [CrossRef]

Figures

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Fig. 1

Schematic meridional section of the test setup with probe measurement planes D and F

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Fig. 5

Plane F—time-resolved distribution of the Mach number and stochastic fluctuations of total pressure. The LP rotor phase.

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Fig. 7

Plane F—RMS of the coherent fluctuations of the total pressure

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Fig. 2

Plane D—time-averaged distribution of the Mach number; splitter setup

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Fig. 3

Plane D—time-averaged distributions of the RMS of the stochastic fluctuations of the total pressure for the two configurations

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Fig. 4

Plane D—contour plots of the RMS of the deterministic fluctuations of the pressure for the two configurations

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Fig. 6

Plane F—RMS of the coherent fluctuations of the flow yaw angle computed from the RSA

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