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Performance enhancement using blade tip injection coupled with casing treatment

Beheshti, B. H ; Sharif University of Technology | 2004

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  1. Type of Document: Article
  2. Publisher: 2004
  3. Abstract:
  4. The casing treatment and flow injection upstream of the rotor tip are two effective approaches in suppressing instabilities or recovering from a fully developed stall. The current work presents a state of the art design for the blade tip injection. This is characterized by a high pressure fluid injecting means for delivery of a jet flow directly into the casing treatment machined into the shroud. The casing treatment is positioned over the blade tip region and exceeds the impeller axially by some 30% of the tip chord both in the upstream and downstream directions. Using an injected mass flow of around 2.4% of the annulus flow, the present design can improve stall margin by up to 7% by comparison with a smooth casing fan without tip injection. This research can lead to an optimum design of recirculating casing treatments or other mechanisms for performance enhancement applying tip flow injection. © IMechE 2004
  5. Keywords:
  6. Axial flow turbomachinery ; Computer simulation ; Data acquisition ; Fans ; Performance ; Turbomachine blades
  7. Source: International Conference on FANS, London, 9 November 2004 through 10 November 2004 ; Volume 2004 4 , 2004 , Pages 35-44 ; 13561448 (ISSN)