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Aerodynamic implications of reduced vane count
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2015 (English)In: Proceedings of the ASME Turbo Expo, ASME Press, 2015Conference paper (Refereed)Text
Abstract [en]

Given the shortage of fossil fuels and the growing greenhouse effect, one strive in modern gas turbines is to make maximum usage of the burnt fuel. By reducing the number of vanes or blades and thereby increasing the loading per vane (or blade) it is possible to spend less cooling air, which will have a positive impact on the combined cycle efficiency. It also reduces the number of components and usage of metal and thereby also the cost of the engine. These savings should be achieved without any efficiency deficit in aerodynamic efficiency. Based on the fact, aerodynamic investigations were performed to see the aerodynamic implications of reduced vane number in a transonic annular sector cascade. The number of new nozzle guide vane was reduced with 24% compared to a previous design with higher vane count. The investigated vanes were two typical high pressure gas turbine vanes. Results regarding the loading indicated an expected increase with the reduced vane case. The minimum static pressure at the suction side is lower and at an earlier location for the reduced vane case and therefore, an extension of the trailing edge deceleration zone is observed for the reduced vane case. Results regarding losses indicate that even though the losses produced per vane significantly increases for the reduced vane case, a comparison of mass averaged losses between the reduced vane case and previous vane case show similar spanwise loss distributions. Assessing results leads to a conclusion that the reduction of the number of vanes in the first stage seems to be a useful method to save cooling flow as well as material costs without any significant deficit in overall efficiency.

Place, publisher, year, edition, pages
ASME Press, 2015.
Keyword [en]
Aerodynamics, Combustion, Efficiency, Fossil fuels, Gas turbines, Greenhouse effect, Nozzle design, Aerodynamic efficiency, Combined-cycle efficiency, High pressure gas, Loss distribution, Nozzle guide vanes, Number of components, Overall efficiency, Static pressure, Cost reduction
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-187507DOI: 10.1115/GT2015-42409ISI: 000380084400050ScopusID: 2-s2.0-84954357063ISBN: 9780791856635OAI: diva2:937418
ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015, 15 June 2015 through 19 June 2015

QC 20160615

Available from: 2016-06-15 Created: 2016-05-25 Last updated: 2016-08-23Bibliographically approved

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