Dynamic interactions in the rotor-bearing-support structure system of the multi-stage ORC microturbine

  • Grzegorz Żywica
  • Łukasz Breńkacz
  • Paweł Bagiński
This article discusses the dynamical analysis of the rotating system of a multi-stage vapour microturbine designed to operate in a combined heat and power ORC-based power plant with an electrical capacity of up to 100 kW. Besides the research carried out on a high- speed rotor and bearings, the analysis also took into account dynamic properties of the machine support structure consisting of a casing, steel base platform and a frame. The numerical computations also covered the vibrations of asynchronous electro-generator connected to the microturbine shaft by a reduction gear. The analysis was conducted using of both commercial and in-house developed software. This allowed the inclusion of some specific factors of a structural and operational nature (affecting dynamic performance characteristics of the tested machine) into the model. On the basis of the results obtained, the dynamic properties of the rotor-bearing-supporting structure systems have been evaluated. The unfavourable dynamical phenomena were observed which can affect the operation of the machine and lead to damage during its normal operation. Based on the results of analysis the diagnostics system dedicated for microturbine has been also developed. 1
Type of Publication:
rotor dynamics; microturbines; ORC Systems
VETOMAC XII International Conference on Vibration Engineering And Technology of Machinery