Novel methods for axial fan impeller geometry analysis and experimental investigations of the generated swirl turbulent flow

Protic, D Zoran; Nedeljković, Miloš; Čantrak, S.; Janković, Novica Z.

doi:10.2298/tsci100617025p

Cited by 12 publications

(14 citation statements)

References 4 publications

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“…Also, an algebraic model was made for calculation of the pressure and velocity profiles along the pipe. Results of calculation are compared with the experimental ones in Benišek [6,7,9,13,18,25,28], Benišek et al [15,16,34,39,50,51,53,60,70,75,76,79,80,86,88,93,94,98,99,102,115], Protić et al [14,20,31,38,45,77,114], Čantrak S. [19,21,26,33,37,48,68,81,101], Čantrak S. et al [24,27,30,35,36,49,…”

Section: Swirl Flow Integral Parametersmentioning

confidence: 99%

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The school of the turbulent swirling flow at the Faculty of Mechanical Engineering University of Belgrade

et al. 2017

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hydraulic turbines to be continued by the experimental and analytical approaches on the axial fans pressure side. The complexity of 3-D, non-homogeneous, anisotropic turbulent velocity fields required complex experimental and theoretical approach, associated with the complex numerical procedures. Analytical approaches, complex statistical analyses and experimental methods and afterwards CFD employed in the research are presented in this paper. The 150 scientific papers, numerous diploma works, several master of science (magister) theses, six Ph. D. theses and two in progress, 40 researchers, national and international projects are the facts about the School. Scientific references are chronologically presented. Numerous abstracts from scientific conferences, presentations, projects with industry and lectures are not given here.Many researchers of the School of the turbulent swirling flow at the Faculty of Mechanical Engineering, University of Belgrade (FME UB) carried on and contributed to the research of the turbulent swirling flows . Vušković (1912Vušković ( -2005 published his first paper [1] in 1941, where he studied the problem of generation and stability of the vortex core in turbomachines, specifically behind the hydraulic turbine runners. Vušković continued his research and afterwards published paper [2], and Vušković and Velenšek [4].Obradović [3] discussed vortex hydrodynamic stability with constant circulation in the cylindrical pipes.Determination of the dead water diameter behind the axial fan without guide vanes was done by Protić [5]. Also, he was the first to introduce the idea of investigating the turbulent swirling flow behind the axial fan in the pipe. Further investigations are conducted at the Chair for hydraulic machinery and energy systems and at the Chair for fluid mechanics FME UB.Experimental investigations of the turbulent swirling flow in the long lined straight pipes behind the axial fan without guide vanes started at the FME UB in 1972, when experimental test rig was built and measurement equipment was designed by Benišek. First results from this test rig were published in [6,7,9,13]. Čantrak S. [19] was the first to commence investigations of turbulence at the FME UB and implemented turbulence statistics in the turbulent swirling flow.These investigations are ongoing getting deeper into the turbulent swirling flow phenomenology. The defended theses and published papers are part of this review and are listed in references. Chronologically are presented almost all scientific papers, a number of master of science (magister) theses and six Ph. D. theses that belong to the School. Two Ph. D. theses in this field are in progress. Numerous diploma works were defended at the Chair for hydraulic machinery and energy systems and at the Chair for fluid mechanics FME UB in this field. Forty researchers from Serbia, and from abroad as well, are members of this School. National and international projects, numerous abstracts from scientific conferences, presentations, projects for industry and le...

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Section: Swirl Flow Integral Parametersmentioning

confidence: 99%

“…In the vortex core Čantrak Dj. introduced stereo particle image velocimetry (SPIV) in his research in 2007 [106,108,114,118,119,121,122,125,126,127,128,132,133,139,141,146,147,150]. He investigated the structure of turbulent swirl flow generated by the axial fan impellers in the pipe.…”

Section: Turbulence Statisticsmentioning

confidence: 99%

The school of the turbulent swirling flow at the Faculty of Mechanical Engineering University of Belgrade

et al. 2017

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“…The swirling confined jet treated here is different from the conventional jet because of the existence of a tangential component velocity. To attain this type of flow, one can either use the axial fan impeller for generating rotating turbulent flow, or use swirling mechanical systems [14]. For example, this system includes inclined vanes, Figures 2a and 2c, which is put in the generating tube jet, Figure 2b.…”

Section: Experimental Setup and Techniquesmentioning

confidence: 99%

Numerical investigation of thermal characteristics of confined rotating multi-jet

Roudane

Loukarfi

Khelil

et al. 2013

Mechanics & Industry

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For using the swirling jet for air conditioning and heating in the premises, knowledge of the thermal characteristics is more than necessary. It is for this objective that the experimental and numerical study was realized. To conduct this study, we designed and built an experimental facility to ensure proper conditions of confinement in which we placed five air blowing devices with adjustable vanes, providing multiple swirling turbulent jet with a swirl number S = 0.4. The jets were issued in the same direction and the same spacing defined between them. This study concerned the numerical simulation of the thermal mixing of confined swirling multi-jets, and examined the influence of important parameters of a swirl diffuser system on the performance characteristics. The experimental measurements are also realized for a confined domain, aiming to determine the axial and radial temperature field. The CFD investigations are carried out by an unstructured mesh to discretize the computational domain. In this work, the simulations have been performed using the finite volume method and FLUENT solver, in which the standard k-ε, K-ε realizable, k-ε RNG and the RSM turbulence model were used for turbulence computations. The validation shows that the K-ε RNG model can be used to simulate this case successfully.

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“…1. To achieve this type of flow, one can either use the axial fan impeller for generating swirl turbulent flow, or use swirling mechanical systems [19]. On the latter, seven devices blowing hot air are fixed and directed downwards, and the lower part of these devices is used to fix different types of diffiisers provided with inclined vanes, depending on the studied configuration.…”

Section: Experimental Set-up and Techniquesmentioning

confidence: 99%

Improvement of thermal homogenization using multiple swirling jets

et al. 2012

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The aim of this study is to examine different blowing configurations of multiple swirling jets for use it in terminal units of ventilation applications. The influence of several parameters such as the inclined vanes of diffuser and the sense of rotation of the single or multiple swirling jets, their number and their arrangement on the flow resulting dynamically and thermally is experimentally investigated. Flow rate was adjusted at Reynolds numbers, Re0, ranging from 104 to 30.103. The current study is carried out under uniform heat flux condition for each diffuser at Reynolds number of 30.103, the air being the working fluid. Experiences concerning the fusion of several jets show that the resulting jet is clearly more homogenized under swirling influence. The findings of this study show that the gap between the jets and their sense of rotation relative to the central jet, affects the quality of the homogenization of ambiance. Among the studied different configuration, the one which consists of a swirling central jet controlling the behavior of six swirling jets in counter-rotation is shown to be the most effective in terms of thermal destratification

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Novel methods for axial fan impeller geometry analysis and experimental investigations of the generated swirl turbulent flow

Cited by 12 publications

References 4 publications

The school of the turbulent swirling flow at the Faculty of Mechanical Engineering University of Belgrade

The school of the turbulent swirling flow at the Faculty of Mechanical Engineering University of Belgrade

Numerical investigation of thermal characteristics of confined rotating multi-jet

Improvement of thermal homogenization using multiple swirling jets

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