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NUMERICAL INVESTIGATION OF BLADE LEADING EDGE CONTOURING BY FILLET AND BASELINE CASE OF A TURBINE VANE: A comparative study of the effect on secondary flow
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The understanding of secondary flow behavior has become an important aspect in the design of modern gas turbines. Secondary flow gives rise to aerodynamic losses, distorts the thermal field and affects the flow conditions at the exit of a passage negatively. Therefore, reducing secondary flow is a major concern for efficiency improvement. Many passive control-methods have been suggested by turbine designers and researchers, and one very promising modification is blade leading edge contouring near the endwall. At the Division of Heat and Power Technology KTH, Stockholm, a detailed experimental investigation of three filleted nozzle guide vanes in an annular sector cascade has been performed, providing excellent experimental data for numerical validation of complex turbine flows.

Based on the above, a numerical study and aerodynamic investigation for a leading edge filleted vane and baseline vane has been performed. The potential effect of the leading edge fillet on flow structure and secondary losses has been evaluated based on a number of flow parameters, and computational predictions have been compared to experimental results.

The numerical investigation has shown some differences in the flow behavior between the filleted and baseline case. All results indicate that the fillet affects the flow structure in regions close to the hub endwall. It shifts the position of vortices and loss core. However, the overall effect on reducing secondary losses downstream of the passage is insignificant. Additionally, the numerical results show good qualitative agreement with experimental results.

Place, publisher, year, edition, pages
2012.
Keyword [en]
CFD, Secondary flow
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-98655OAI: oai:DiVA.org:kth-98655DiVA: diva2:538184
Uppsok
Technology
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Available from: 2012-06-29 Created: 2012-06-28 Last updated: 2012-06-29Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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More styles
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  • de-DE
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  • Other locale
More languages
Output format
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