Wyniki wyszukiwania - BazTech

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Experimental testing of the influence of the operating loading on the flow characteristics of hydraulic pump

Kosiba Ján, Tkáč Zdenko, Jablonický Juraj, Shcherbak Valeriia, Ganushchak-Yefimenko Liudmyla, Paumer Martin, Bukoros Tetiana, Čurgaliová Gabriela, Zachar Martin

Eksploatacja i Niezawodność

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2022

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Vol. 24, no. 3

583--589

EN

The contribution deals with the influence of the operating loading on the flow characteristics of the hydraulic pump under laboratory conditions. In the test, a new toothed hydraulic pump and hydraulic oil with kinematic viscosity at 40°C, ν = 64.2 mm2.s-1 were used. The operational loading was measured during the most difficult agrotechnical operation – ploughing, at which the loading of the hydraulic pump is the greatest. Laboratory testing was determined for 200 hours, and the flow characteristics had been detected at 50 hours intervals. Measurement of the flow characteristics was performed at rated speed n = 1,000 rpm. Measurement of the flow characteristics was carried out in dependence on the loading pressure from p = 0 MPa to p = 20 MPa. When p = 0 MPa, the value reached n = 91.70% and when p = 20 MPa, n = 86.68%. Running-in of the hydraulic pump lasted 150 hours, with an increase of the flow characteristics Δηvol = 1.36% (p = 10 MPa) compared to the initial state. After working for 200 hours, the flow rate of the hydraulic pump decreases compared to 150 hours.

2

Investigations of aerodynamics of Tesla bladeless microturbines

Lampart P., Jędrzejewski Ł.

Journal of Theoretical and Applied Mechanics

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2011

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Vol. 49 nr 2

477-499

EN

The paper presents an analysis of a Tesla bladeless turbine for a cogenerating micro-power plant of heat capacity 20 kW, which operates in an organic Rankine cycle with a low-boiling medium. Numerical calculations of the flow in several Tesla turbine models are performed for a range of design parameters. Results of the investigations exhibit interesting features in the distribution of flow parameters within the turbine interdisk space. The efficiency of the Tesla turbine depends on many parameters, including pressure, temperature and velocity conditions, rotational speed of the rotor as well as on the number, diameter, distance between the disks and the state of the disk surface and, finally, on the number and arrangement of the supply nozzles. The calculated flow efficiences of the investigated Tesla turbine models show that the best obtained solutions can be competitive as compared with classical small bladed turbines.

PL

W pracy przedstawiono analizę bezłopatkowej turbiny tarczowej Tesli pracującej w organicznym obiegu Rankine'a z czynnikiem niskowrzącym w mikrosiłowni kogene- racyjnej o mocy cieplnej 20 kW. Wykonano obliczenia numeryczne przepływu w turbinie Tesli w szerokim zakresie zmienności parametrów pracy turbiny. Wyniki badań obrazują szereg ciekawych cech w rozkładzie parametrów przepływu w przestrzeniach międzytarczowych turbiny. Sprawność turbiny Tesli zależy od wielu parametrów przepływowych, takich jak ciśnienie, temperatura, prędkość czynnika, prędkość obrotowa wirnika, oraz od wielu parametrów geometrycznych, m.in. od liczby i średnicy tarcz, odległości między tarczami, stanu powierzchni tarcz oraz układu dysz zasilających. Obliczone sprawności modeli turbiny Tesli wskazują, że najlepsze rozwiązania tej turbiny mogą konkurować z klasycznymi turbinami łopatkowymi.

3

Design analysis of Tesla micro-turbine operating on a low-boiling medium

Lampart P., Kosowski K., Piwowarski M., Jędrzejewski Ł.

Polish Maritime Research

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2009

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S 1

28-33

EN

This paper presents results of the design analysis of a Tesla bladeless turbine intended for a co-generating micro-power plant of heat capacity 20 kW, which operates in an organic Rankine cycle on a low-boiling medium. Numerical calculations of flow in several Tesla turbine models were performed for a range of design parameters. Results of investigations exhibit interesting features in the distribution of flow parameters within the turbine interdisk space. The calculated flow efficiency of the investigated Tesla turbine models show that the best obtained solutions can be competitive as compared with classical small bladed turbines.

4

Criteria of similarity for use of fans and verification

Fortuna S.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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1999

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nr 115

115--122

EN

The similarity between two flows of a real medium in the geometrically similar area does exist when similarity numbers derived from the simple equations of motion are equal. These numbers are output, pressure, power and efficiency. The accuracy of the calculation of fans performance from the condition of equality of the above numbers is limited. In the paper is presented the method of determination of capacity with regard to the volumetric efficiency in the model and in the machine. The flow efficiency in the recalculation of the pressure growth and the internal efficiency in the power recalculation, both could be determined by e.g. the Ackeret equation. The recalculation of the characteristics has been significantly more precise in that way.