Computer-Aided Solution to the Vibrational Effect of Instabilities in Gas Turbine Compressors
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Abstract
Surge and stall are the two main types of instabilities that often occur on the compressor system of gas turbines. The effect of this instability often leads to excessive vibration due to the back pressure imposed to the system by this phenomenon. In this work, fouling was observed as the major cause of the compressor instability. A step to analyze how this phenomenon can be controlled with the continuous examination of the vibration amplitude using a computer approach led to the execution of this work. The forces resulting to vibration in the system is usually external to it. This external force is aerodynamic and the effect was modeled using force damped vibration analysis. A gas turbine plant on industrial duty for electricity generation was used to actualize this research. The data for amplitude of vibration varied between -15 and 15 mm/s while the given mass flow rate and pressure ratio were determined as falling between 6.1 to 6.8 kg/s and 9.3 to 9.6 respectively. A computer program named VICOMS written in C++ programming language was developed. The results show that the machine should not be run beyond 14.0 mm vibration amplitude in order to avoid surge, stall and other flow-induced catastrophic breakdown.
- K. Iwakiri, M. Furukawa, S. Ibaraki and I. Tomita, “Unsteady and 3D Flow Phenomena in Transonic Centrifugal Compressor Impeller at Rotating Stall,” Proceedings of ASME Turbo Expo, Orlando, Florida, 8-12 June 2009. www.teurbexpo.org
- R. Kurz, “Surge Control Design System Design,” Proceedings of ASME Turbo Expo, Orlando, Florida, 8-12 June 2009. www.teurbexpo.org
- J.-L. Lu, W. Chu and K. Peng, “Nu-merical and Experimental Research of Stall Inception on Sub-sonic Axial Flow Compressor Rotor,” Journal of Aerospace Engineering, Vol. 48, No. 2, 2010, pp. 3-4.
- T. Okada, A. Kawajiri, O. Yataka and O. Eisuke, “Stall Inception Process and Prospects for active Hub-Flap control in Three Stage axial flow compressor,” Journal of Thermal Science, Co-Published with Springer-Varlag GmbH, 2008, pp. 4-8.
- E. A. Ogbonaya, “Modeling Vibration-Based Faults in Rotor Shaft of Gas Turbine,” Ph.D. Dessertation, Depart- ment of Marine Engineering, Nigeria, 2004, pp. 20-22, 92-95, 180-181.
- J. Huabing, Y. Wei, L. Yagun and L. Quishi, “Experi- mental Investigation of the Influence of Inlet Distortion on the Stall Inception in a Low Speed Axial Compre- ssor,” Proceedings of ASME Turbo Expo, Orlando, Florida, 8-12 June 2009. www.Teurbex-po.org
- S. S. Rao, “Mechanical Vibration,” 4th Edition, Pvt Ltd., Dorling Kingsley, Licenses of Pearson Education in South Asia.
- C. B. Meher-Homji, M. Chaker and A. E. Brouley, “The Fouling of Axial Flow Compres-sor-Causes, Effects Susceptibility and Sensitivity,” Proceedings of ASME Turbo Expo, Orlando, Florida, 8-12 June 2009. www.teurbexpo. org
- M. Morini, M. Pinelli, P. R. Spina and M. Venturini, “Influence of Blade Deterioration on Com-pressor and Turbine Performance,” ASME Paper GT2008-50043, 2008.
- T. W. Song, J. L. Sohn, T. S. Kim and T. R. O. Sung, “An Improved Analytic Model to Predict Fouling Phenomena in the Axial Flow Compressor of Gas Tur-bine Engines,” Proceedings of the International Gas Turbine Congress, Tokyo, 2-7 November 2003.
- A. D. Mezherisky and A. V. Sudarev, “The Mechanism of Fouling and the Cleaning Technique in Application to Flow Parts of Power Generation Plant Compressors,” ASME Paper 90-GT-103, 1990.
- C. B. Meher-Homji, “Gas Turbine Axial Compres-sor Fouling: A Unified Treatment of its Effect, Detection and Control,” International Journal of Turbo and Jet Engines, Vol. 9, No. 4, 1992, pp. 99-111.