Header menu link for other important links
X
Computation of flow through an annular diffuser and volute exhaust
M. B. Arun, E. G. Tulapurkara,
Published in Defense Scientific Information and Documentation Centre
2006
Volume: 56
   
Issue: 2
Pages: 147 - 158
Abstract
Turbulent flow in a diffuser with swirl occurs in many commonly used fluid mechanical devices.eg, diffusers located downstream of a gas turbine, and in certain types of combustion chambers. Diffusers are widely used for converting kinetic energy to pressure, and a reliable prediction method of such flows with the required flow conditions would lead to the design of fluid machinery with improved efficiency. As a first step, turbulent swirling flow through a 12° included angle conical diffuser for a swirl parameter, m = 0.18 was numerically investigated using various turbulence models like standard k-ε, RNG-based k-ε, shear-stress transport (SST) k-ω, and Reynolds stress model (RSM). Though the comparison between the experimental and the predicted mean velocity profile by RSM is superior to that by RNG k-ε and SST models, the latter two models give closer comparison with the experimental pressure distribution. Subsequently, computation of flow inside a complex duct involving axisymmetric annular diffuser, transition from rectangular to circular cross section, and exit pipe have been carried out using RNG k-ε and SST k-ω models. The comparison of computed and experimental results indicates that the SST k-ω model gives predictions with reasonable accuracy. © 2006, DESIDOC.
About the journal
JournalDefence Science Journal
PublisherDefense Scientific Information and Documentation Centre
ISSN0011748X
Open AccessYes
Concepts (13)
  •  related image
    Diffusers (fluid)
  •  related image
    FLUID MECHANICS
  •  related image
    Pipe flow
  •  related image
    Pressure distribution
  •  related image
    Reynolds number
  •  related image
    Shear strength
  •  related image
    Turbulent flow
  •  related image
    ANNULAR DIFFUSER
  •  related image
    Computer model
  •  related image
    Conical diffuser
  •  related image
    SWIRL PARAMETER
  •  related image
    Turbulence models
  •  related image
    Flow measurement