Numerical analysis of the rotor of a 30 kw ORC microturbine considering properties of aerodynamic gas bearings

• Autorzy: Breńkacz Ł. , Żywica G. , Bogulicz M.
• Języki publikacji: EN

Abstrakty

EN

The paper focuses on the analysis of a 30 kW microturbine operating in the organic Rankine cycle (ORC) with a low-boiling working medium. The nominal speed of the rotor is 40,000 rpm. The investigated microturbine is an oil-free machine, which means that its bearings use the ORC working medium as a lubricant. We created a numerical model, which was used to assess the dynamic properties of the newly designed microturbine. The conducted analyses covered, inter alia, the optimization of some geometrical parameters of each bearing in order to cause the lubricating film to be created at a correspondingly low rotational speed as well as to obtain optimal dynamic properties of the system. The article provides a full dynamic picture of the rotor supported by two aerodynamic gas bearings. The included graphs demonstrate the vibration amplitude of the shaft as a function of the rotational speed as well as the results of the modal analysis in the form of natural vibration modes of the system and their corresponding natural frequencies.

Słowa kluczowe

EN

microturbine; dynamic analysis; rotor dynamics; gas bearings; organic Rankine cycle

PL

mikroturbina; analiza dynamiczna; dynamika wirnika; łożyska gazowe; organiczny obieg Rankine’a

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Mechanics and Mechanical Engineering
• Rocznik: 2018
• Tom: Vol. 22, nr 2
• Strony: 425--435
• Opis fizyczny: Bibliogr. 17 poz., il. (w tym kolor.), wykr.

Twórcy

autor

Breńkacz Ł.

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Department of Turbine Dynamics and Diagnostics, Gdansk, Poland

autor

Żywica G.

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Department of Turbine Dynamics and Diagnostics, Gdansk, Poland

autor

Bogulicz M.

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Department of Turbine Dynamics and Diagnostics, Gdansk, Poland

Bibliografia

• [1] Żywica, G., Drewczyński, M., Kiciński, J., Rządkowski, R.: Computational modal and strength analysis of the steam microturbine with fluid-film bearings, Journal of Vibrational Engineering and Technologies, 2, 6, 543-549, 2014.
• [2] Sung, T., Yun, E., Kim, H. D., Yoon, S. Y., Choi, B. S., Kim, K., Kim, K. C.: Performance characteristics of a 200-kW organic Rankine cycle system in a steel processing plant, Applied Energy, 183, 623-635, 2016.
• [3] Lecompte, S., Huisseune, H., Van Den Broek, M., Vanslambrouck, B., De Paepe, M.: Review of organic Rankine cycle (ORC) architectures for waste heat recovery, Renewable and Sustainable Energy Reviews, 47, 448-461, 2015.
• [4] Lee, H. G., Shin, J. H., Choi, C. H., Jeong, E., Kwon, S.: Partial admission effect on the performance and vibration of a supersonic impulse turbine, Acta Astronautica, 145, 105-115, 2018.
• [5] Żywica, G., Kaczmarczyk, T. Z., Ihnatowicz, E., Turzyński, T.: Experimental investigation of the domestic CHP ORC system in transient operating conditions, Energy Procedia, 129, 637-643, 2017.
• [6] Bini, R., Colombo, D.: Large multistage axial turbines, Energy Procedia, 129, 1078-1084, 2017.
• [7] Żywica, G., Kiciński, J., Bagiński, P.: The static and dynamic numerical analysis of the foil bearing structure, Journal of Vibrational Engineering and Technologies, 4, 3, 213-220, 2016.
• [8] Bonello, P., Hassan, M. F. B.: An experimental and theoretical analysis of a foil-air bearing rotor system, Journal of Sound and Vibration, 413, 395-420, 2018.
• [9] Tkacz, E., Kozanecki, Z., Kozanecka, D.: Numerical methods for theoretical analysis of foil bearing dynamics, Mechanics Research Communications, 82, 9-13, 2017.
• [10] Żywica, G., Bagiński, P., Breńkacz, Ł., Miąskowski, W., Pietkiewicz, P., Nalepa, K.: Dynamic state assessment of the high-speed rotor based on a structural flow model of a foil bearing, Diagnostyka, 18, 1, 95-102, 2017.
• [11] Bagiński, P., Żywica, G., Lubieniecki,M., Roemer, J.: The effect of cooling the foil bearing on dynamics of the rotor-bearings system, Journal of Vibroengineering, 20, 2, 843-857, 2018.
• [12] Song, P., Wei, M., Shi, L., Danish, S. N., Ma, C.: A review of scroll expanders for organic Rankine cycle systems, Applied Thermal Engineering, 75, 54-64, 2015.
• [13] Mounier, V., Olmedo, L. E., Schiffmann, J.: Small scale radial inflow turbine performance and pre-design maps for Organic Rankine Cycles, Energy, 143, 1072-1084, 2018.
• [14] Kaczmarczyk, T. Z., Żywica, G., Ihnatowicz, E.: The impact of changes in the geometry of a radial microturbine stage on the efficiency of the micro CHP plant based on ORC, Energy, 137, 530-543, 2017.
• [15] Kiciński, J.: Dynamics of rotors and slide bearings (in Polish), Gdansk: IMP PAN, Maszyny Przeplywowe, 2005.
• [16] Tkacz, E., Kozanecki, Z., Kozanecka, D., Łagodziński, J.: A Self-Acting Gas Journal Bearing with a Flexibly Supported Foil - Numerical Model of Bearing Dynamics, International Journal of Structural Stability and Dynamics, 17, 5, 1740012, 2017.
• [17] ISO 1940-1 Mechanical vibration - balance quality requirements for rotors in a constant (rigid) state. Part 1: Specification and verification of balance tolerances, 2003.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).