Novica Z. Janković

Experimental and Numerical Research on Swirl Flow in Straight Conical Diffuser

Dejan B. Ilić, Jelena Svorcan, Djordje Cantrak, Novica Z. Janković

The main objective of the current study is a detailed (both numerical and experimental) investigation of the highly unsteady and complex swirl flow in a straight conical diffuser (with a total divergence angle of 8.6°) generated by an axial fan impeller. Pressure, …

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MEHANIZAM ZA KALIBRACIJU SONDE SA VIŠE RUPICA ZA MERENjE PROSTORNOG POLJA BRZINA I PRITISKA U VENTILACIONIM SISTEMIMA

Milan Bulajić, Novica Z. Janković, Djordje Cantrak

Experimental and numerical research of the flow inside the control valves trim

Dejan B. Ilić, Novica Z. Janković, Djordje Cantrak, Ljubomir Savić

In this paper are presented desing, testing and numerical analysis for two manufactured control valve trims. Valve trim is consisted of cage or dick stack, plug, stem and seat. Size from app. 15.88 mm (0.625 in) up to 101.6 mm (4 in) …

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High speed stereoscopic PIV investigation of the statistical characteristics of the axially restricted turbulent swirl flow behind the axial fan in pipe

Djordje Cantrak, Novica Z. Janković

Investigation of the turbulent swirl flow in the piping system is one of the most complex investigations in the field of energetics and turbulence. Axial fans in a pipe, without guide vanes, are widely used in practice and the problem of their …

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Turbulence Structure and Dynamics Investigation of Turbulent Swirl Flow in Pipe Using High-Speed Stereo PIV Data

Djordje Cantrak, Novica Z. Janković

Turbulent swirl flow, which exists in numerous turbomachinery systems, is the focus of this paper. It consumes a significant amount of energy, so it is a subject of investigation for many researchers. It is even more present in ventilation systems, as numerous …

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LDV Investigation of The Self Induced Pre-swirl and Flow Visualization at The Centrifugal Pump Inlet and Outlet

Đorđe čantrak, Novica Z. Janković, Milos Srecko Nedeljkovic, Dejan B. Ilić

Turbulent swirling flow occupies attention of numerous researchers worldwide. In this paper are presented experimental results of the research of the self induced pre-swirl by the centrifugal impeller. Circumferential velocity was measured in two cross-sections by use of the one-component laser Doppler …

Kolmogorov's similarity hypotheses application in research of the turbulent swirl flows in pipe generated by the various axial fan geometries

Djordje Cantrak, Novica Z. Janković, Milos Srecko Nedeljkovic

Abstract Kolmogorov has formulated his two hypotheses of similarity in 1941 considering local‐isotropic turbulence, and later has refined his theory [1, 2]. In this paper are discussed three turbulent swirl flows generated by the three various axial fan types in‐built in the …

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Induction Machine Driven Pump Applied as Turbine in Micro-hydro Power Plants

Mateja Nikolić, Dejan Mrsevic, Leposava Ristić, Djordje Cantrak et autres

There is a potential for increasing energy efficiency, as well as financial cost-effectiveness of modern water distribution networks, irrigation systems, wastewater treatment plants and intense water usage industries in general, by incorporating micro-hydro turbines in certain points of the system where excess …

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Turbulent swirl flow analysis by Kolmogorov's similarity hypotheses

Djordje Cantrak, Novica Z. Janković, Milos Srecko Nedeljkovic

Abstract Turbulent swirl flow generated by the axial fans in pipe is investigated in this paper by using Kolmogorov's similarity hypotheses. It is shown that energy in the inertial subrange is divided among eddies after the “−5/3” law, i.e. Φww ∝ f−5/3, …

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New Design of the Reversible Jet Fan

Miroslav Benišek, Djordje Cantrak, Dejan B. Ilić, Novica Z. Janković

This paper presents two designs of the axial reversible jet fan, with the special focus on the impeller. The intention was to develop a reversible axial jet fan which operates in the same way in both rotating directions while generating thrust as …

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LDA Experimental Research of Turbulent Swirling Flow Behind the Axial Fans in Pipe, Jet and Diffuser

Djordje Cantrak, Novica Z. Janković, Dejan B. Ilić

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Coherent vortex structure investigation behind the axial fan in pipe

Djordje Cantrak, Novica Z. Janković, Milos Srecko Nedeljkovic

Abstract Experimental investigation of the coherent vortex structure in pipe on the axial fan pressure side, by use of the velocity optical measurement techniques, is reported in this paper. Generated vortex structure, its velocity and turbulent statistical values are revealed and discussed.

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