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Experimental evaluation of the dynamic properties of an energy microturbine with defects in the rotating system
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Department of Turbine Dynamics and Diagnostics Institute of Fluid Flow Machinery, Polish Academy of Sciences Fiszera 14 str., 80-231 Gdansk, Poland
Publication date: 2019-12-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2019;21(4):670-678
Today’s energy systems increasingly use various types of microturbines to produce electricity. A specific feature of such machines is a high-speed rotor, whose rotational speed can be higher than 100,000 rpm. Failure-free operation of highspeed microturbine rotors requires both special design and high precision during the manufacturing process. What is more, proper procedures must be followed during run-up and coast-down phases; and also, dedicated diagnostic systems have to be used. This article discusses the experimental research conducted on a 2.5 kW vapour microturbine that operated in a prototypical combined heat and power plant. A series of measurements was carried out to evaluate the dynamic performance of the machine during normal operation. After the appearance of certain defects in the rotating system, it was necessary to perform a new series of measurements in order to assess the dynamic properties of the machine. The measurements results obtained in the form of vibration velocity spectrums made it possible to define diagnostic symptoms corresponding to particular defects. Similar diagnostic symptoms can occur during the operation of this class of turbomachines.
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