Low-pressure reversible axial fan designed with different specific work of elementary stages

Bogdanovic, P Bozidar; Spasic, T Zivan; Bogdanović-Jovanović, Jasmina

doi:10.2298/tsci120503195b

Cited by 5 publications

(5 citation statements)

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“…(8), can be written as follows: 3 33 1n div Δ w Δ w =0 q , , Ln (9) According to inviscous fluid flow model, blade surfaces are flow surfaces (n w), therefore, the second element on the left side of equation is equal to zero, and averaged equation becomes: For the known field of averaged meridian velocities 1 1 2 () w q ,q and 2 1 2 ( ), w q ,q and known function of cross-section reduced coefficient due to actual thickness of the blades 12 ( ), k q ,q using the equation (12), the meridian stream function m 1 2 () q ,q can be determined, i. e. meridian streamlines m 1 2 ( ) const q ,q ., which represent traces of the sections between averaged axisymmetric flow surfaces and meridian planes. It can be demonstrated easily that m dd Q,and the flow rate through the randomly selected axysimmetrical crosssection, where meridian trace is a line A-B, shown in fig.…”

Section: Averaging Of Flow Equationsmentioning

confidence: 99%

“…Since, w w w and rotc rotc (rotc) , the averaged equation of relative flow in turbomachinery impeller (9) can be written in the form:…”

Section: Qmentioning

confidence: 99%

“…The diagram of function ug ( ) ( ), rc f r which is in proportion to the specific works of elementary stages, is also given in fig. 8, showing the unequal distribution of specific work of elementary stages [9,10].…”

Section: General Equation Of Averaged Axisymmetric Flow In Turbomachimentioning

confidence: 99%

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Determination of averaged axisymmetric flow surfaces according to results obtained by numerical simulation of flow in turbomachinery

2012

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In the increasing need for energy saving worldwide, the designing process of turbomachinery, as an essential part of thermal and hydroenergy systems, goes in the direction of enlarging efficiency. Therefore, the optimization of turbomachinery designing strongly affects the energy efficiency of the entire system. In the designing process of turbomachinery blade profiling, the model of axisymmetric fluid flows is commonly used in technical practice, even though this model suits only the profile cascades with infinite number of infinitely thin blades. The actual flow in turbomachinery profile cascades is not axisymmetric, and it can be fictively derived into the axisymmetric flow by averaging flow parameters in the blade passages according to the circular coordinate. Using numerical simulations of flow in turbomachinery runners, its operating parameters can be preliminarily determined. Furthermore, using the numerically obtained flow parameters in the blade passages, averaged axisymmetric flow surfaces in blade profile cascades can also be determined. The method of determination of averaged flow parameters and averaged meridian streamlines is presented in this paper, using the integral continuity equation for averaged flow parameters. With thus obtained results, every designer can be able to compare the obtained averaged flow surfaces with axisymmetric flow surfaces, as well as the specific work of elementary stages, which are used in the procedure of blade designing. Numerical simulations of flow in an exemplary axial flow pump, used as a part of the thermal power plant cooling system, were performed using Ansys CFX. [Projekat Ministarstva nauke Republike Srbije, br. TR33040: Revitalization of existing and designing new micro and mini hydropower plants (from 100 kW to 1000 kW) in the territory of South and Southeast Serbia

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Section: Averaging Of Flow Equationsmentioning

confidence: 99%

“…Since, w w w and rotc rotc (rotc) , the averaged equation of relative flow in turbomachinery impeller (9) can be written in the form:…”

Section: Qmentioning

confidence: 99%

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Determination of averaged axisymmetric flow surfaces according to results obtained by numerical simulation of flow in turbomachinery

2012

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“…To this day many books and papers on fan designing methods and their performance characteristics have been published [1][2][3][4][5]. Numerous experimental investigations of fan performances, using different measuring techniques, have been carried out, with the objective to improve fan design methods and to increase fan efficiency [6][7][8]. Design methods are constantly improving by using modern CFD techniques for numerical simulations of fluid flow in fan runners [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Performance of low-pressure fans operating with hot air

et al. 2016

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Performance characteristics of fans are generally provided for the normal temperature and pressure conditions (t I = 20 °C, p I = 101.325 kPa, ρ I = 1.2 kg/m 3). Very often, fans operate in different air conditions, occasionally at different air temperatures. In these cases, equations obtained by the law of similarity are usually used for recalculation of the fan operating parameters. Increasing the inlet air temperature causes a decrease in the characteristic of Reynolds number, and may lead to efficiency lowering of the fan. There are also some empirical formulas for recalculation of fan efficiency, when operating at different air temperatures. In this paper, the common way for obtaining fan performance for different operating conditions (air temperature changing) is presented. The results, obtained by recalculation of fan parameters using a law of similarity, are compared to numerical simulation results of the axial-flow fan operating with different air temperatures. These results are compared with results obtained by some recommended empirical formulas, as well. This paperwork is limited to low-pressure and mid-pressure fans, which represents the majority of all fans used in practice, for different purposes.

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“…There are some earlier suggestions proposing the use of an unequal distribution of the specific work of elementary stages in turbomachinery designing [17,18]. The justification of such an assumption (unequal distribution of u rc ) is shown in Fig.…”

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confidence: 99%

Determination of Averaged Axisymmetric Flow Surfaces and Meridian Streamlines in the Centrifugal Pump Using Numerical Simulation Results

et al. 2017

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Low-pressure reversible axial fan designed with different specific work of elementary stages

Cited by 5 publications

References 0 publications

Determination of averaged axisymmetric flow surfaces according to results obtained by numerical simulation of flow in turbomachinery

Determination of averaged axisymmetric flow surfaces according to results obtained by numerical simulation of flow in turbomachinery

Performance of low-pressure fans operating with hot air

Determination of Averaged Axisymmetric Flow Surfaces and Meridian Streamlines in the Centrifugal Pump Using Numerical Simulation Results

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