Mechanical Engineering; Energy Engineering and Power Technology; Aerospace Engineering
Abstract :
[en] The aerodynamics of a high-speed low-pressure turbine (LPT) cascade were investigated under steady and unsteady inlet flows. The tests were performed at outlet Mach (M) and Reynolds numbers (Re) of 0.90 and 70k, respectively. Unsteady wakes were simulated by means of a wake generator equipped with bars. A bar reduced frequency (f+) of ∼0.95 was used for the unsteady case. The inlet flow field was characterized in terms of the total pressure profile and incidence. The blade aerodynamics at midspan and the secondary flow region were investigated by means of pneumatic taps and hot-film sensors. The latter provided a novel view into the impact of the secondary flows on the heat transfer topology on the blade suction side (SS). The cascade performance was quantified in terms of the outlet flow angle and losses by means of a directional multi-hole probe. The results report the phase-averaged impact of unsteady wakes on the secondary flow structures in an open test case high-speed LPT geometry.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Do Carmo Lopes, Gustavo Filipe ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M) ; Turbomachinery and Propulsion Department, von Kàrmàn Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-St-Genèse, Belgium
Simonassi, Loris; Turbomachinery and Propulsion Department, von Kàrmàn Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-St-Genèse, Belgium
Lavagnoli, Sergio ; VKI - Von Karman Institute for Fluid Dynamics [BE]
Language :
English
Title :
Impact of Unsteady Wakes on the Secondary Flows of a High-Speed Low-Pressure Turbine Cascade
Publication date :
22 September 2023
Journal title :
International Journal of Turbomachinery, Propulsion and Power
H2020 - 820883 - SPLEEN - Secondary and Leakage Flow Effects in High-SPeed Low-PrEssurE TurbiNes
Funders :
EU - European Union [BE]
Funding text :
The authors gratefully acknowledge the funding of the SPLEEN project by the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation program under the grant agreement 820883.
Kurzke J. Fundamental Differences Between Conventional and Geared Turbofans ASME Turbo Expo 2009: Power for Land, Sea, and Air Paper No: GT2009-59745 ASME New York, NY, USA 2009 145 153 10.1115/GT2009-59745
Hodson H.P. Howell R.J. The role of transition in high-lift low-pressure turbines for aeroengines Prog. Aerosp. Sci. 2005 41 419 454 10.1016/j.paerosci.2005.08.001
Torre D. García-Valdecasas G. Puente A. Hernández D. Luque S. Design and Testing of a Multi-Stage IP Turbine for Future Geared Turbofans ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition Paper No: GT2021-59219 ASME New York, NY, USA 2021 V02BT32A007 10.1115/GT2021-59219
Hourmouziadis J. Aerodynamic design of low pressure turbines AGARD Lecture Series 167 Von Karman Institute Rhode-St-Genèse, Belgium 1989
Giovannini M. Rubechini F. Marconcini M. Arnone A. Bertini F. Analysis of a LPT Rotor Blade for a Geared Engine: Part I—Aero-Mechanical Design and Validation ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition ASME New York, NY, USA 2016 V02BT38A053 10.1115/GT2016-57746
Malzacher F.J. Gier J. Lippl F. Aerodesign and Testing of an Aeromechanically Highly Loaded LP Turbine J. Turbomach. 2003 128 643 649 10.1115/1.2172646
Langston L. Secondary Flows in Axial Turbines—A Review Ann. N. Y. Acad. Sci. 2001 934 11 26 10.1111/j.1749-6632.2001.tb05839.x 11460621
Sharma O.P. Butler T.L. Predictions of Endwall Losses and Secondary Flows in Axial Flow Turbine Cascades J. Turbomach. 1987 109 229 236 10.1115/1.3262089
Sieverding C.H. Van den Bosche P. The use of coloured smoke to visualize secondary flows in a turbine-blade cascade J. Fluid Mech. 1983 134 85 89 10.1017/S0022112083003237
Wang H.P. Olson S.J. Goldstein R.J. Eckert E.R.G. Flow Visualization in a Linear Turbine Cascade of High Performance Turbine Blades J. Turbomach. 1997 119 1 8 10.1115/1.2841006
Denton J.D. Loss Mechanisms in Turbomachines ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition ASME New York, NY, USA 1993 V002T14A001 10.1115/93-GT-435
Satta F. Simoni D. Ubaldi M. Zunino P. Bertini F. Profile and secondary flow losses in a high-lift LPT blade cascade at different reynolds numbers under steady and unsteady inflow conditions J. Therm. Sci. 2012 21 483 491 10.1007/s11630-012-0572-z
Brunner S. Fottner L. Schiffer H.P. Comparison of Two Highly Loaded Low Pressure Turbine Cascades Under the Influence of Wake-Induced Transition ASME Turbo Expo 2000: Power for Land, Sea, and Air ASME New York, NY, USA 2000 V003T01A073 10.1115/2000-GT-0268
Duden A. Fottner L. Influence of taper, Reynolds number and Mach number on the secondary flow field of a highly loaded turbine cascade Proc. Inst. Mech. Eng. Part A J. Power Energy 1997 211 309 320 10.1177/095765099721100401
Hodson H.P. Dominy R.G. The Off-Design Performance of a Low-Pressure Turbine Cascade J. Turbomach. 1987 109 201 209 10.1115/1.3262086
Hodson H.P. Dominy R.G. Three-Dimensional Flow in a Low-Pressure Turbine Cascade at Its Design Condition J. Turbomach. 1987 109 177 185 10.1115/1.3262083
Lopes G. Simonassi L. Torre A.F.M. Patinios M. Lavagnoli S. An Experimental Test Case for Transonic Low-Pressure Turbines—Part 2: Cascade Aerodynamics at On- and Off-Design Reynolds and Mach Numbers ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition ASME New York, NY, USA 2022 V10BT30A027 10.1115/GT2022-82626
Abo El Ella H.M. Sjolander S.A. Praisner T.J. Effects of an Upstream Cavity on the Secondary Flow in a Transonic Turbine Cascade J. Turbomach. 2012 134 051009 10.1115/1.4003818
Perdichizzi A. Mach Number Effects on Secondary Flow Development Downstream of a Turbine Cascade J. Turbomach. 1990 112 643 651 10.1115/1.2927705
Taremi F. Endwall Flows in Transonic Turbine Cascades Ph.D. Thesis Carleton University Ottawa, ON, Canada 2013
Behr T. Control of Rotor Tip Leakage and Secondary Flow by Casing Air Injection in Unshrouded Axial Turbines Ph.D. Thesis ETH Zurich Zurich, Switzerland 2007 10.3929/ethz-a-005478482
Lengani D. Paradiso B. Marn A. Göttlich E. Identification of Spinning Mode in the Unsteady Flow Field of a Low Pressure Turbine J. Turbomach. 2012 134 051032 10.1115/1.4004875
Ong J. Miller R.J. Uchida S. The Effect of Coolant Injection on the Endwall Flow of a High Pressure Turbine J. Turbomach. 2012 134 051003 10.1115/1.4003838
Infantino D. Satta F. Simoni D. Ubaldi M. Zunino P. Bertini F. Phase-Locked Investigation of Secondary Flows Perturbed by Passing Wakes in a High-Lift LPT Turbine Cascade ASME Turbo Expo 2015: Turbine Technical Conference and Exposition ASME New York, NY, USA 2015 V02CT44A008 10.1115/GT2015-42480
Volino R.J. Galvin C.D. Ibrahim M.B. Effects of Periodic Unsteadiness on Secondary Flows in High Pressure Turbine Passages ASME Turbo Expo 2013: Turbine Technical Conference and Exposition ASME New York, NY, USA 2013 V06CT42A042 10.1115/GT2013-95881
Ciorciari R. Kirik I. Niehuis R. Effects of Unsteady Wakes on the Secondary Flows in the Linear T106 Turbine Cascade J. Turbomach. 2014 136 091010 10.1115/1.4027374
Lopes G. Simonassi L. Lavagnoli S. Impact of Unsteady Wakes on the Secondary Flows of a High-Speed Low-Pressure Turbine Cascade Proceedings of the 15th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Paper n. ETC2023-290 Budapest, Hungary 24–28 April 2023 Available online: https://www.euroturbo.eu/publications/conference-proceedings-repository/ (accessed on 19 September 2023)
Simonassi L. Lopes G. Gendebien S. Torre A.F.M. Patinios M. Lavagnoli S. Zeller N. Pintat L. An Experimental Test Case for Transonic Low-Pressure Turbines—Part I: Rig Design, Instrumentation and Experimental Methodology ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition ASME New York, NY, USA 2022 V10BT30A012 10.1115/GT2022-81566
Pfeil H. Herbst R. Schröder T. Investigation of the Laminar-Turbulent Transition of Boundary Layers Disturbed by Wakes J. Eng. Power 1983 105 130 137 10.1115/1.3227373
Bellhouse B.J. Schultz D.L. Determination of mean and dynamic skin friction, separation and transition in low-speed flow with a thin-film heated element J. Fluid Mech. 1966 24 379 400 10.1017/S0022112066000715
Halstead D.E. Wisler D.C. Okiishi T.H. Walker G.J. Hodson H.P. Shin H.W. Boundary Layer Development in Axial Compressors and Turbines: Part 1 of 4—Composite Picture J. Turbomach. 1997 119 114 127 10.1115/1.2841000
Oldfield M.L.G. Kiock R. Holmes A.T. Graham C.G. Boundary Layer Studies on Highly Loaded Cascades using Heated Thin Films and a Traversing Probe J. Eng. Power 1981 103 237 246 10.1115/1.3230703
Pucher P. Goehl R. Experimental Investigation of Boundary Layer Separation With Heated Thin-Film Sensors J. Turbomach. 1987 109 303 309 10.1115/1.3262103
Hodson H. The detection of boundary-layer transition and separation in high speed turbine cascades Measurement Techniques for Transonic and Supersonic Flow—Proc. 7th Symposium University of Cambridge Cambridge, UK 1984
Hodson H.P. Huntsman I. Steele A.B. An Investigation of Boundary Layer Development in a Multistage LP Turbine J. Turbomach. 1994 116 375 383 10.1115/1.2929424
Hultmark M. Smits A.J. Temperature corrections for constant temperature and constant current hot-wire anemometers Meas. Sci. Technol. 2010 21 105404 10.1088/0957-0233/21/10/105404
Simoni D. Berrino M. Ubaldi M. Zunino P. Bertini F. Off-Design Performance of a Highly Loaded Low Pressure Turbine Cascade Under Steady and Unsteady Incoming Flow Conditions J. Turbomach. 2015 137 071009 10.1115/1.4029200
Vera M. Hodson H. Low Speed vs. High Speed Testing of LP Turbine Blade-Wake Proceedings of the 16th Symposium on Measuring Techniques in Transonic and Supersonic Flow in Cascades and Turbomachines Cambridge, UK 23–24 September 2002 1 10
Simonassi L. Lopes G. Lavagnoli S. Effects of Periodic Incoming Wakes on the Aerodynamics of a High-Speed Low-Pressure Turbine Cascade Proceedings of the 15th European Conference on Turbomachinery Fluid Dynamics & Thermodynamics Budapest, Hungary 24–28 April 2023 Available online: https://www.euroturbo.eu/publications/conference-proceedings-repository/ (accessed on 23 June 2023)
Coull J. Clark C. Vazquez R. The sensitivity of turbine cascade endwall loss to inlet boundary layer thickness J. Glob. Power Propuls. Soc. 2019 3 540 554 10.22261/JGPPS.OEYMDE
Coull J.D. Endwall Loss in Turbine Cascades J. Turbomach. 2017 139 081004 10.1115/1.4035663
Coull J.D. Clark C.J. The Effect of Inlet Conditions on Turbine Endwall Loss J. Turbomach. 2022 144 101011 10.1115/1.4054443
Pullan G. Denton J. Dunkley M. An Experimental and Computational Study of the Formation of a Streamwise Shed Vortex in a Turbine Stage J. Turbomach. 2003 125 291 297 10.1115/1.1545766
Kacker S.C. Okapuu U. A Mean Line Prediction Method for Axial Flow Turbine Efficiency J. Eng. Power 1982 104 111 119 10.1115/1.3227240
