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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4651

Title: Performance of a generic non-axisymmetric end wall in a single stage, rotating turbine at on and off-design conditions
Authors: Snedden, G
Dunn, D
Ingram, G
Gregory-Smith, D
Keywords: Non-axisymmetric end wal
Generic non-axisymmetric
Rotating turbines
ASME Turbo Expo 2010
Issue Date: Jun-2010
Publisher: 2010 by ASME
Citation: Snedden, G, Dunn, D, Ingram, G and Gregory-Smith, D. 2010. Performance of a generic non-axisymmetric end wall in a single stage, rotating turbine at on and off-design conditions. ASME Turbo Expo 2010: Power for Land, Sea and Air. Glasgow, 14-18 June 2010, pp 12
Series/Report no.: Conference Paper
Abstract: The application of non-axisymmetric end walls in turbine stages has gained wide spread acceptance as a means to improve the performance of turbines in both power generation and aero-derivative applications. Non-axisymmetric end walls are aimed at the control of secondary flows and to a large extent have been developed through the use of computational fluid dynamics and detailed measurements in linear and annular cascades and proven in full scale engine tests. Little or no literature is available describing their performance at conditions other than design. This study utilises 5-hole probe measurements in a low speed, model turbine in conjunction with computational fluid dynamics to gain a more detailed understanding of the influence of a generic end wall design on the structure of secondary flows at both on and off-design flow conditions. Results indicate a 0.4% improvement in rotor efficiency at design but this was reduced at off design and at higher loading the rotor efficiency was reduced by 0.5%. Stage efficiencies were improved for all conditions but with a declining trend as load was increased. Experimental and CFD results are examined to investigate these findings further.
Description: ASME Turbo Expo 2010: Power for Land, Sea and Air. Glasgow, 14-18 June 2010
URI: http://hdl.handle.net/10204/4651
Appears in Collections:Aeronautic systems
General science, engineering & technology

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