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1
Content available Hybrid bearing development for high-speed turbomachinery in distributed energy systems
Tkacz E., Kozanecki Z., Łagodziński J.
Transactions of the Institute of Fluid-Flow Machinery
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2016
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nr 131
161--172
EN
In the paper authors undertake the design of hydrostatic bearings and hybrid bearings for a specific application – hermetic high–speed turbogenerators for the electric power generation. The most common hydrostatic bearings are usually oil lubricated. On the contrary, the considered here machines are dedicated for the combined heat and power (CHP) production in organic Rankine cycle (ORC) systems and so the hydrostatic bearings use an organic, oil-free working fluid as the lubricant. The reader will acquire an insight into the special characteristics of hydrostatic bearings. Moreover, a new type of bearings, a hybrid bearing, is introduced, which combine both, hydrostatic and hydrodynamic effects. The designed bearings have been manufactured and their good performance confirmed during tests on a real machine.
2
Content available A combined numerical-experimental model of air foil bearing compliant structure
Łagodziński J., Zieliński P.
Transactions of the Institute of Fluid-Flow Machinery
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2016
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nr 133
117--129
EN
The paper concerns the development process of numerical-experimental model of air foil bearing compliant structure. Theoretically, static and dynamic characteristics of the foil bearing are the result of elastic combined properties of the two serially connected elements. One of them is a thin gas film of very small thickness and relatively high static and dynamic stiffness. The second elastic element is a pretensioned bump foil spring. This paper focuses on the properties of compliant foil structure and leaves aside the gas film behavior. At the beginning of the model development, the global stiffness and damping properties of compliant structure were obtained from the test stand measurements. In the next step, some assumptions concerning the model were made. The main one was the replacememy of the single bumps of the corrugated foil by the set of elastic-damping numerical elements. At last, the fine-tuning of the model was carried out. The tuning involved changing of subelements local damping and stiffness properties, which in effect influenced the global properties of foil bearing. The tuning criterion for the model was defined as follows: the bearing global stiffness and damping properties of the model should not differ from the experimentally obtained values more than 10%.
3
Content available remote Konstrukcje turbozespołów obiegu ORC
Łagodziński J., Kozanecki Z., Kozanecka D., Tkacz E.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2015
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nr 147
39--48
PL
W pracy przedstawiono założenia konstrukcyjne i autorskie, innowacyjne koncepcje budowy bezolejowych turbogeneratorów z układami niekonwencjonalnych łożysk nośnych wykorzystujące niskotemperaturowe źródła ciepła dla celów produkcji energii elektrycznej.
EN
The innovative technology of high-speed turbomachinery, with nonconventional oil-free bearings, working in Combined Heat and Power (CHP) systems to produce electricity is described. Low temperature heat sources require the use of a low–boiling medium for turbine propulsion, running in an Organic Rankine Cycle.
4
Content available remote Oil free bearing development for high-speed turbomachinery in distributed energy systems – dynamic and environmental evaluation
Tkacz E., Kozanecka D., Kozanecki Z., Łagodziński J.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2014
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nr 145
121--122
EN
Modern distributed energy systems, which are used to provide an alternative to or an enhancement of traditional electric power systems, require small size high-speed rotor turbomachinery to be developed. The existing conventional oil-lubricated bearings reveal performance limits at high revolutions as far as stability and power loss of the bearing is concerned. Non-conventional, oil-free bearings lubricated with the machine working medium could be a remedy to this issue. This approach includes a correct design of the machine flow structure and an accurate selection of the bearing type. Chosen aspects of the theoretical and experimental investigations of oil-free bearings and supports, including magnetic, tilting pad, pressurized aerostatic and hydrostatic bearings as well as some applications of oil-free bearing technology for high-speed turbomachinery are described in the paper.
5
Content available remote Application of a compliant foil bearing for the thrust force estimation in the single stage radial blower
Łagodziński J., Miazga K., Musiał I.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2014
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nr 145
87--88
EN
The paper presents an application of a compliant foil bearing for estimation of the thrust force in the single stage radial blower under operational conditions. The bump foil of the thrust bearing behaves as a nonlinear spring. The knowledge of the spring deflection curve allows one to estimate the actual thrust force for a measured bump deflection at the given rotational speed. To acquire the deflection curve, static calibration of the axial shaft displacement sensor was performed. During the calibration, the information about voltage signals of the sensor for the given loading force was gathered. Then, the measured voltage values at different speeds and loads were recalculated to the thrust force. The results were verified by a comparison to the thrust force resulting from the pressure distribution on the impeller.
6
Content available remote Niekonwencjonalne bezolejowe łożyska wysokoobrotowe turbogeneratora dla obiegu ORC
Kozanecki Z., Kozanecka D., Łagodziński J., Tkacz E.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2013
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nr 143
115--126
PL
Obecnie w małych nowoczesnych systemach produkcji energii najczęściej stosowane są mikroturbiny o mocy rzędu od 1 do 20 kW. Niezwykle istotny jest rozwój niezawodnej technologii łożyskowania wirników tych miniaturowych maszyn przepływowych. Prezentowany w artykule układ wirujący turbogeneratora podparto w bezolejowych łożyskach foliowych. Podatne łożyska foliowe są rodzajem łożysk hydrodynamicznych, które wykorzystują gaz z otoczenia jako czynnik smarujący, co znacząco upraszcza ich konstrukcję.
EN
In modern low-power generation systems, microturbines of the power output ranging between 1 and 20 kW are applied. The development of reliable bearing technology for high-speed small turbomachinery could be essential to these power-generating devices. The rotating system presented in the paper is supported in oil-free, airfoil bearings. Compliant surface foil gas bearings are a class of hydrodynamic bearings that use the ambient gas as their working fluid and, thus, require no dedicated lubrication systems, which makes their design much simpler.
7
Content available remote Investigations of coating materials for air-foil bearings
Miazga K., Tkacz E., Kozanecki Z., Łagodziński J.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2011
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nr 140
149-156
EN
Air-Foil Bearings are popular topics of research as a new kind of rotor support systems. Their specific construction brings a possibility of working with high rotational speeds at low power losses in a wide temperature range. Despite many advantages, Air-Foil Bearings meet problems of friction and wear in critical moments of their operation. The paper presents investigations of the materials which reduce an influence of undesirable effects.
8
Content available Failure diagnosis of the gas compressor diaphragm vane
Kozanecki Z., Łagodziński J., Kozanecka D.
Diagnostyka
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2009
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nr 4(52)
65-71
EN
The goal of this paper was to develop a methodology of explanation of diaphragm vane defects in a two-stage centrifugal compressor which had occurred in during operation of the machine. The methodology consisted of experimental investigations of the disassembled diaphragm, then a dynamical analysis using the finite element method on the 3D diaphragm model, obtained by reversing engineering with an optical photogrammetric camera of the TRITOP CMM measuring system. The final purpose of this research work was to formulate the recommendations to avoid future problems.
PL
Celem pracy było opracowanie metodyki pozwalającej na wyjaśnienie przyczyn uszkodzeń łopatek kierownicy dwustopniowej sprężarki promieniowej, które powstały w okresie eksploatacji maszyny. Zaproponowana metodyka obejmuje badania eksperymentalne oraz weryfikację modelu teoretycznego 3D kierownicy, opracowanego przy wykorzystaniu nowoczesnego systemu optycznej metody skanowania w widmie światła białego TRITOP CMM. Końcowym efektem pracy było sformułowanie zaleceń modyfikacji konstrukcji maszyny dla eliminacji tego problemu.
9
Content available remote Modelowanie pola magnetycznego metodą elementów skończonych w układzie detekcji ruchu suwaka wzmacniacza hydraulicznego
Łagodziński J.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2007
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nr 131
61-68
PL
W pracy przedstawiono analizę wyników badań modelowych układu detekcji ruchu magnes - kontaktron suwaka sterującego wzmacniacza hydraulicznego. Przeprowadzona analiza pozwoliła na optymalizację konstrukcji oraz dobór materiałów ze względu na wymaganą dokładność i niezawodność działania układu.
EN
The paper presents a model research analysis of the permanent magnet - reed switch motion detection system of the hydraulic amplifier. The analysis allows to improve the construction and material selection for better precision and reliability of the system.
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