Header menu link for other important links
Investigations on low speed axial compressor with forward and backward sweep
Mukka S. Govardhan, Nekkanti Sitaram
Published in
Volume: 16
Issue: 2
Pages: 121 - 133
In the recent past, experimental studies have shown some advantages of blade lean and sweep in axial compressors. As most of the experimental results are combined with other features, it is difficult to determine the effect of individual parameters on the performance of the compressor. The present numerical studies are aimed at understanding the performance and three-dimensional flow pattern at the exit of swept and unswept rotors. Three rotors, namely; unswept, 200 forward swept and 200 backward swept rotors are analysed with a specific intention of understanding the pattern of the blade boundary layer flow. The analysis was done using a fully three-dimensional viscous CFD code CFX-5. Results indicated reduction in pressure rise with sweep. Backward sweep is detrimental as far as the performance near endwalls is considered. On the other hand total pressure loss in the wake in mid span region is less with backward sweep, which favours its application here. However, backward sweep adversely affects the stall margin. The ability of the forward sweep to deflect the streamlines towards hub gets diminished at low flow rates. Forward sweep changes the streamline pattern in such a way that the suction surface streamlines are deflected towards the hub and the pressure surface streamlines are deflected towards the casing. An opposite behaviour is observed in backward swept rotors. © 2007 Science Press.
About the journal
JournalJournal of Thermal Science
Open AccessNo
Concepts (9)
  •  related image
    Flow patterns
  •  related image
    Numerical methods
  •  related image
    Parameter estimation
  •  related image
    Turbomachine blades
  •  related image
    Blade loading
  •  related image
  •  related image
    Stall margin
  •  related image
  •  related image