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Statistical characteristics and time autocorrelation coefficients of the turbulent swirl flow in pipe
Author(s) -
Čantrak Đorđe,
Janković Novica,
Ilić Dejan
Publication year - 2016
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201610278
Subject(s) - turbulence , autocorrelation , mechanics , flow (mathematics) , physics , jet (fluid) , mathematics , statistics
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. (© 2016 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)