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Design and manufacturing of micro-turbomachinery components with application of heat resistant plastics

Żywica G., Kaczmarczyk T., Ihnatowicz E., Bagiński P., Andrearczyk A.

Mechanics and Mechanical Engineering

2018

Vol. 22, nr 2

649--660

The article discusses issues associated with the use of modern plastics for the construction of high-speed fluid-flow machines. Currently available plastics exhibit high chemical resistance as well as dimensional and shape stability across a wide temperature range. This allows them to be used for manufacturing components of micro turbomachinery, thereby reducing production time and costs. This article discusses the criteria for the selection of plastics suitable for a particular machine, namely micro turbogenerator operating in the organic Rankine cycle (ORC). In addition to the initial selection of materials based on their chemical and physical properties, strength calculations of selected turbogenerator subassemblies were carried out. The obtained results confirmed that some plastics can replace traditional materials used in the manufacture of ORC turbogenerators. This concerns, in particular, the components of the microturbine blade system. After the manufacture of a trial series of such components, it became apparent that, with appropriately chosen plastics, it is possible to shorten the machining time and reduce production costs, all while maintaining the required dimensional tolerances. The results obtained so far prove that it is possible to use plastics to produce components of modern turbomachines, for instance, parts of high-speed microturbines that have to withstand high operating temperatures.

Thermal Study of Retaining Sleeves for a High-Speed Permanent-Magnet Electrical Machine

Kolondzovski Z., Cvetkovski G.

Przegląd Elektrotechniczny

2008

R. 84, nr 12

177-180

In this paper, a thermal analysis of two different rotor constructions of a high-speed permanent magnet electrical machine is performed. The first type of rotor has a carbon-fibre sleeve for retaining the magnets against centrifugal forces and an aluminium shield for eddy currents. The other rotor has a retaining sleeve made of a titanium alloy and does not have an additional eddy-current shield. The results show that although the rotor with a retaining sleeve made of a titanium alloy does not have any eddy-current shield, it fulfils the thermal constraints.

W artykule przeprowadzono analizę dwóch konstrukcji wysokoobrotowych maszyn elektrycznych z magnesami trwałymi. Pierwsza konstrukcja jest znamienna tym, że posiada pozycjonującą wirnik wykonaną z włókien węglowych ekran aluminiowy dla prądów wirowych. Druga konstrukcja zaś posiada tulejkę ze stopu tytanowego i nie posiada ekranu dla tłumienia prądów wirowych. Wyniki badań wskazują to, iż ta druga konstrukcja spełnia wymagania cieplne.