THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL INVESTIGATIONS OF THE TURBULENT SWIRL FLOW IN STRAIGHT CONICAL DIFFUSERS WITH VARIOUS ANGLES

ABSTRACT
Results of experimental investigations of the turbulent swirl flow in three straight conical diffusers with various diffuser total angles are presented in this paper. All three diffusers have the inlet diameter 0.4 m and total divergence angles 8.6°, 10.5°, and 12.6°. The incompressible swirl flow field is generated by the axial fan impeller, and for each diffuser several regimes were achieved by changing rotation number. Original classical probes were used for measurements. The distributions of the average main swirl flow characteristics along the diffuser are shown. Distributions of the inlet Boussinesq number, outlet Coriolis coefficient, ratio of the swirl and completely axial flow loss coefficients at conical diffuser on the inlet swirl flow parameter are also presented.
KEYWORDS
PAPER SUBMITTED: 1970-01-01
PAPER REVISED: 2016-03-23
PAPER ACCEPTED: 2016-04-29
PUBLISHED ONLINE: 2016-08-07
DOI REFERENCE: https://doi.org/10.2298/TSCI160205193I
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Supplement 3, PAGES [S725 - S736]
REFERENCES
  1. Azad, R.S., Turbulent Flow in a Conical Diffuser: A Review, Experimental Thermal and Fluid Science, 13 (1996), pp. 318-337
  2. Benišek, M.H., et al., Investigation of the Turbulent Swirl Flows in a Conical Diffuser, Thermal Sci-ence, Vol. 14 (2010), Supplement 1, pp. S141 - S154
  3. Čantrak Đ., et al., Investigation of the Turbulent Swirl Flow in Pipe Generated by Axial Fans using PIV and LDA Methods, Theoretical and Applied Mechanics, Vol. 42 (2015), Issue 3, pp. 211-222
  4. Benišek, M., Investigation of the Swirl Flow in Long Lined Circular Pipes (in Serbian), Ph.D. thesis, Univ. Belgrade, Faculty of Mech. Eng., Belgrade, Serbia, 1979
  5. Benišek, M.H., et al., Aplication of New Classical Probes in Swirl Fluid Flow Measurements, Experimental Techniques, Vol. 34 (2010), Issue 3, pp. 74-81
  6. Benišek, M., et al., Universal Calibration Characteristics Conrad Probe for Measures 3D Velocity, Pres-sure and Total Pressure of Stationary Inviscid Fluid Flow, Proceedings of Metrological, Yug. Cong., Novi Sad, Serbia, 2000
  7. Ilić, D.B., Swirl Flow in Conical Diffusers, Ph.D. thesis, Univ. Belgrade, Faculty of Mech. Eng., Bel-grade, Serbia, 2013
  8. Čantrak, S., Hydrodynamics - Selected Chapters (in Serbian), Faculty of Mechanical Engineering, Bel-grade, Serbia, 1998
  9. Strscheletzky, M., Equilibrium Forms of the Axisymmetric Flows with Constant Swirl in Straight, Cy-lindrical Rotation Geometries (in German), Voith Forschung und Konstruktion, Heft 5 (1959), Aufsatz 1
  10. Kitoh, O., Experimental Study of Turbulent Swirl Flow in a Straight Pipe, J. Fluid Mech., Vol. 225 (1991), pp. 445-479
  11. Mahmud, T., et al., Flow Characterizations of Swirl Coaxial Jets from Diverging Nozzels, J. Fluid Eng., Vol. 109 (1987), pp. 275-281
  12. Baker, W., Sayre, C.L., Decay of Swirl Flow of Incompressible Fluids in Long Pipes, Flow: Its Meas. And Control in Sci. And Ind., Proc. Symp., Pt. 1, Pittsburgh, USA, 1971, Vol l, pp. 301-312
  13. Povh, I.L., Aerodynamic Experiments in Mechanical Engineering (in Russian), Moscow, Leningrad, SSSR, 1974

© 2018 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence