Investigation of structure and non‐gradient turbulent transfer in swirling flows

Gabi, Martin; Janković, Novica Z.; Čantrak, S.

doi:10.1002/pamm.201210237

Cited by 6 publications

(12 citation statements)

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“…Measurements of these quantities were carried out in 12 appropriately selected points in one cross section of a straight circular pipe. More details about experiment can be found in [9].…”

Section: Swirl Flow Propertiesmentioning

confidence: 99%

“…An important characteristic of turbulent swirl flow is distribution of anisotropy component uv a . Negative values of this component in vortex core and shear flow region mean that the transfer of axial linear momentum is directed toward the pipe axis, which will result with smoother downstream velocity profile [9].…”

Section: Representation Of Anisotropy In Turbulencementioning

confidence: 99%

“…The aim of this paper is to present and analyse part of experimental results from [9] in order to improve our knowledge of the anisotropy in swirl flow. The AIM and BM were used in order to obtain easier understanding of swirl influence on the anisotropy of turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy analysis of turbulent swirl flow

Radenkovic¹,

Burazer²,

Novkovic³

2014

FME Transaction

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“…Measurements of these quantities were carried out in 12 appropriately selected points in one cross section of a straight circular pipe. More details about experiment can be found in [9].…”

Section: Swirl Flow Propertiesmentioning

confidence: 99%

Section: Representation Of Anisotropy In Turbulencementioning

confidence: 99%

See 1 more Smart Citation

Anisotropy analysis of turbulent swirl flow

Radenkovic¹,

Burazer²,

Novkovic³

2014

FME Transaction

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“…Overview of the experimental investigation of the turbulent swirl flow following the axial fan is presented in [1][2][3][4]. Here is presented case of the axially unrestricted turbulent swirl flow behind the three axial fans.…”

Section: Introductionmentioning

confidence: 99%

“…Here is presented case of the axially unrestricted turbulent swirl flow behind the three axial fans. Fan ZP30 has specific geometry and is designed after the law of constant circulation [1][2][3], while other two are classical industrial fans [4]. Investigation of the complex three dimensional, inhomogeneous and anisotropic turbulent swirl flow has theoretical and practical significance.…”

Section: Introductionmentioning

confidence: 99%

Statistical characteristics and time autocorrelation coefficients of the turbulent swirl flow in pipe

Čantrak

Janković

Ilić

2016

Proc Appl Math and Mech

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In this paper is presented experimental investigation of the turbulent swirl flow in pipe generated by three axial fans of various geometries. One of these fans (model ZP) generates Rankine swirl, while other two, industrial fans, produce mainly solid body circumferential velocity profile. One-component laser Doppler anemometry (LDA) is employed in this research. Downstream transformations of the non-dimensional time-averaged velocity profiles are analyzed. Distributions of turbulence levels are discussed for all three fans in both measuring sections, as well as statistical moments of higher orders for fluctuations in the axial, radial and circumferential directions. Applied correlation theory revealed turbulence structure and its statistical nature.

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Coherent vortex structure investigation behind the axial fan in pipe

Čantrak

Janković

Nedeljković

2019

Proc Appl Math and Mech

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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. Experiments were conducted by use of the one-component laser Doppler anemometry (LDA) and stereo particle image velocimetry (SPIV) systems. In paper [1] is presented investigation of the non-gradient turbulent transfer in swirl flows, based on 2C LDA measurements, while in paper [2] is presented research of the turbulent swirl flow in pipe behind three axial fans, of which one is ZP30. Here is presented investigation of the turbulent swirl flow in pipe on the ZP22 axial fan pressure side. Generated complex flow is three dimensional, nonhomogeneous and anisotropic. Experimental installationExperimental test rig has a pipe 27.74 D long, where D = 0.4 m is the average inner pipe diameter. It has a profiled bellmouth inlet and axial fan at the inlet. This is, after international standard ISO 5801, case B, with free inlet and ducted outlet. Axial fan has outer diameter 0.399 m and nine adjustable blades. Ratio of the hub and outer diameter is ν = 0.5. This construction generates Rankine swirl flow. Measurements have been performed in the measuring section (z = 3.35 D) on the fan pressure side. Fan rotation speed was n = 1500 rpm and outlet angle at the outer diameter was 22 • . Measurements were performed with one component LDA system, Flow Explorer Mini LDA, Dantec, with BSA F30 signal processor and laser power 35 mW. Velocity components were measured subsequently. Axial and radial velocities were measured from side, while circumferential one from above and under the pipe due to laser focal length, but they overlap in the central region. Discussion of the LDA measuring volume position and its dislocation, due to the curved walls, is calculated and discussed in [3]. In addition, measurements with SPIV system, were conducted by use of the dual head Nd:Yag laser (30 mJ/pulse, 532 nm, 15 Hz) and two 12-bit CCD (charge-coupled device) cameras, lens 50 mm/F1.8, with resolution 1660 x 1200 pixels, and 32 fps. Successful flow seeding for both experimental methods was achieved by Antari Z3000II thermal fog machine.

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Investigation of structure and non‐gradient turbulent transfer in swirling flows

Cited by 6 publications

References 1 publication

Anisotropy analysis of turbulent swirl flow

Anisotropy analysis of turbulent swirl flow

Statistical characteristics and time autocorrelation coefficients of the turbulent swirl flow in pipe

Coherent vortex structure investigation behind the axial fan in pipe

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