Measurements and vibration analysis of a five-stage axial-flow microturbine operating in an ORC cycle
 
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1
Department of Turbine Dynamics and Diagnostics, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Department of Turbine Dynamics and Diagnostics, Fiszera 14, 80-231 Gdańsk, Poland
2
Institute of Fluid Flow Machinery, Polish Academy of Sciences, Department of Turbine Dynamics and Diagnostics, Fiszera 14, 80-231 Gdańsk, Poland
CORRESPONDING AUTHOR
Tomasz Zygmunt Kaczmarczyk   

Department of Turbine Dynamics and Diagnostics, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Department of Turbine Dynamics and Diagnostics, Fiszera 14, 80-231 Gdańsk, Poland, ul. Fiszera 14, 80-231 Gdańsk, Polska
Submission date: 2017-01-26
Final revision date: 2017-03-13
Acceptance date: 2017-03-13
Publication date: 2017-06-21
 
Diagnostyka 2017;18(2):51–58
 
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ABSTRACT
This paper presents results concerning the experimental investigation of a five-stage prototypical axial-flow microturbine operating in an ORC installation. The microturbine has an electrical capacity of 3 kW at the nominal rotational speed of 12000 rpm and is supplied with a low-boiling medium's vapour HFE7100. During the test, both the full vibration frequency distribution and the overall level of the velocity vibrations RMS in the microturbine were measured. A spectral analysis of vibration velocity was conducted during the grind-in process after a modernisation of the shrouding bandage of the microturbine set's flow system took place. The article presents the operational characteristics of the ORC system as well as the characteristics showing the electric power produced as the function of rotational speed of the microturbine. On the basis of the results obtained, there was assessed the dynamic performance of the microturbine and it was ranked according to ISO 10816-1 standard. The paper also shows the measurement results of the so-called kurtosis within the frequency range of 15 to 30 kHz, which made it possible to evaluate the dynamic state of the rolling bearings by which the microturbine's rotor was supported.
eISSN:2449-5220
ISSN:1641-6414