Effect of Diffuser Angle on the Reattachment Point of an Incompressible Airflow


(*) Corresponding author


Authors' affiliations


DOI's assignment:
the author of the article can submit here a request for assignment of a DOI number to this resource!
Cost of the service: euros 10,00 (for a DOI)

Abstract


Numerical Simulation of the two dimensional incompressible airflow in an asymmetric diffuser using one commercially available Computational Fluid Dynamics (CFD) code are reported. The subject is to analyze the effect of diffuser angle on the reattachment point of air flow. Results are presented varying diffuser angle from 2 degree to 20 degree. The mathematical model equations (mass conservation and momentum) are solved using finite volume methods (FVM) and a pressure based approach. To get the grid independent, intensive refinement studies were carried out. Results obtained were compared to experimental data presenting a good agreement. The numerical results of this work show that as the diffuser angle elevates, the flow recirculation region also increases. When there are flow recirculation regions, the value of turbulent kinetic energy also increases. Hence, it is possible identify a need for improvement the design of diffuser or other alternatives to reduce the size of recirculation region, reducing the power necessary at the flow machine to realize the work at the diffuser.
Copyright © 2013 Praise Worthy Prize - All rights reserved.

Keywords


Diffuser; Incompressible Air Flow; Separation and Reattachment Point

Full Text:

PDF


References


N. Bekka, R. Bessaïh, M. Sellam, Numerical Study of Transonic Flows Using Various Turbulence Models, (2008) International Review of Mechanical Engineering (IREME), 2 (4), pp. 599-607.

S. E. Razavi, M. Tabatabaei, An Enhanced Finite-Volume Solution of Incompressible Flow with Heat Transfer in a Backward-Facing Step, (2009) International Review of Mechanical Engineering (IREME), 3 (5), pp. 653-659.

S. Obi, S., K. Aoki, S. Masuda, Experimental and computational study of turbulent separating flow in an asymmetric plane diffuser, Ninth Symposium on Turbulent Shear Flows, p. 305, Kyoto, Japan, August 16-19, 1993.

C. U. Buice, J. K. Eaton, Experimental investigation of flow through an asymmetric plane diffuser”, Report No.TSD-107, Thermosciences Division, Department of Mechanical Engineering, Stanford University, Stanford, CA, USA, 1997.

G. Iaccarino, Prediction of the turbulent flow in a diffuser with commercial CFD codes, Annual Research Briefs, Center for Turbulence Research, USA, 2000.

J. Gullman-Strand, O. Törnblom, B. Lindgren, G. Amberg, A. V. Johansson, Numerical and Experimental Study of separated flow in a plane asymmetric diffuser, International Journal of Heat and Fluid Flow, Vol. 25, pp 451-460, 2004.

T. Dal Bello, V. Dippold III, Computational Study of Separating Flow in a Planar Subsonic Diffuser, NASA, National Aeronautics and Space Administration, Hannover, USA, available electronically at http://gltrs.grc.nasa.gov, 2005.

S. M. El-Behery, M. H. Hamed, A Comparative Study of Turbulence Models Performance for Turbulent Flow in a Planar Asymmetric Diffuser, World Academy of Science, Engineering and Technology, p. 53, 2009.

H. K. Versteeg, W. Malalasekera, W. An introduction to Computational Fluid Dynamics – The Finite Volume Method (Pearson Prentice Hall, England, 1995).

FLUENT Inc. User’s guide, 13.0 version, 2010.

Hazarika, A., Analysis of vertical axis turbine using symmetrical and asymmetrical airfoil for hydro power generation, (2013) International Review on Modelling and Simulations (IREMOS), 6 (1), pp. 254-262.

Jawad, L.H., Abdullah, S., Zulkifli, R., Mahmood, W.M.F.W., Prediction of centrifugal compressor performance by using adaptive neuro-fuzzy inference system (ANFIS), (2012) International Review on Modelling and Simulations (IREMOS), 5 (4), pp. 1580-1587.


Refbacks

  • There are currently no refbacks.


Please send any question about this web site to info@praiseworthyprize.com
Copyright © 2005-2024 Praise Worthy Prize