Aeroelastic Effects In A Transonic Compressor With Nonaxisymmetric Tip Clearance

Autor: Jüngst, Maximilian, Franke, Daniel, Schiffer, Heinz-Peter, Giersch, Thomas
Jazyk: angličtina
Rok vydání: 2018
Předmět:
DOI: 10.5281/zenodo.1345550
Popis: Future axial compressor designs tend to be built with larger relative tip gaps and increased eccentricity, since the core engines are reduced in size. There is considerable uncertainty of the influence of tip clearance non - uniformity on non - synchronous blade vibration amplitudes. The 1.5 stage Darmstadt Transonic Compressor is representative of the front stage of a high pressure compressor. Data is obtained for varying concentric and eccentric tip gap s at design speed. For this study, t he concentric tip gap is increased from 1.25% to 2.5% tip chord length. The investigated non - uniform configurations are 60 % and 96% eccentric. These variations are quite common during engine operation. A modern rotor in blade integrated disc design is used for this research, which is susceptible to vibration due to low mechanical damping. The redistribution of mass flow at the inlet of an eccentric casing influences stall inception. Locally , the compressor is operating unstable, which results in pre - stall disturbances with high count and large amplitude in the sector with a large clearance. The other part of the annulus operates stable and is less disturbed. This aerodynamic diversity results in decreased interaction between fluid and structure. For an eccentric casing, rotor blade vibration amplitudes are lower compared to an equivalent concentric configuration. These results are a novel approach to aerodynamic mistuning.
{"references":["[1] M. Baumgartner, F. Kameier und J. Hourmouziadis, \"Non - Engine Order Blade Vibration in a High Pressure Compressor,\" in Proceedings of 12th International Symposium on Airbreathing Engines (ISABE) , 1995.","[2] J. Dodds und M. Vahdati, \" Rotating Stall Observations in a High Speed Compressor: Part 1 -- Experimental Study,\" in Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition GT2014 , 2014.","[3] R. E. Kielb, J. W. Barter, J. P. Thomas und K. C. Hall, \"Blade E xcitation by Aerodynamic Instabilities: A Compressor Blade Study,\" in Proceedings of the ASME Turbo Expo 2003: Power for Land, Sea, and Air , 2003.","[4] C. Brandstetter, M. Jüngst und H. P. Schiffer, \"Measurements of Radial Vortices, Spill Forward and Vortex Breakdown in a Transonic Compressor,\" in Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition , 2017.","[5] I. J. Day, \"Stall, Surge, and 75 Years of Research,\" Journal of Turbomachinery, Bd. 138, Nr. 1, p. 011001, 20 16.","[6] I. J. Day, \"Stall Inception in Axial Flow Compressors,\" Journal of Turbomachinery, Bd. 115, Nr. 1, p. 1, 1993.","[7] K. Yamada, H. Kikuta, M. Furukawa, S. Gunjishima und Y. Hara, \"Effects of Tip Clearance on the Stall Inception Process in an Axial Compressor Rotor,\" in Proceedings of the ASME Turbo Expo 2013: Power for Land, Sea and Air , 2013.","[8] S. C. Morris, J. D. Cameron, M. A. Bennington, G. S. McNulty und A. Wadia, \" Performance and Short Length - Scale Disturbance Generation in an Axial Compressor With Non - Uniform Tip Clearance,\" in Proceedings of ASME Turbo Expo 2008: Power for Land, Sea and Air GT2008 , 2008.","[9] H. D. Vo, \"Role of Tip Clearance Flow in the Generation of Non - Synchronous Vibrations,\" in 44th AIAA Aerospace Sciences Meeting and Exhibit, 2006.","[10] F. Holzinger, F. Wartzek, M. Jüngst, S. Leichtfuss und H. P. Schiffer, \"Self - Excited Blade Vibration Experimentally Investigated in Transonic Compressors - Rotating Instabilities and Flutter,\" in Proceedings of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition , 2015.","[11] M. Jüngst, F. Holzinger, S. Leichtfuss und H. P. Schiffer, \"Analysing Non - Synchronous Blade Vibrations in a Transonic Compressor Rotor,\" in 11th European Turbomachinery Conference (ETC) , 2015.","[12] C. Freeman, \"Effect of Tip Clearance Flow on Compressor Stability and Engine Performance,\" van Karman Institute for Fluid Dynamics, Lecture Series, 1985.","[13] M. B. Graf, T. S. Wong, E. M. Greitzer, D. C. Wisler, F. E. Marble, C. S. Tan und H. - W. Shin, \"Effects of Nonaxisymmetric Tip Clearance on Axial Compressor Performance and Stability,\" Journal of Turbomachinery, Bd. 120, Nr. Vol. 120 // 4, p. 648, 1998.","[14] A. M. Young, T. Cao, I. J. Day und J. P. Longley, \"Accounting for Eccentricity in Compressor Performance Predictions,\" in ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition , 2016.","[15] M. Zielinski und G. Ziller, \"Noncontact vibration measurements on compressor rotor blades,\" Measurement Science and Technology, Bd. 11, Nr. 7, p. 847 – 856, 2000.","[16] A. M. Young, I. J. Day und G. Pullan, \"Stall Warning by Blade Pressure Signature Analysis,\" in Proceedings of ASME Turbo Expo 2011 , 2011."]}
Databáze: OpenAIRE
Externí odkaz: