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On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data

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dc.contributor.author Snedden, Glen C
dc.contributor.author Dunn, Dwain I
dc.contributor.author Ingram, G
dc.date.accessioned 2019-08-10T12:16:50Z
dc.date.available 2019-08-10T12:16:50Z
dc.date.issued 2018-04
dc.identifier.citation Change Snedden, G., Dunn, D., & Ingram, G. (2018). On- and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data. The Aeronautical Journal, 122(1250), 646-665. doi:10.1017/aer.2018.13 en_US
dc.identifier.issn 0001-9240
dc.identifier.issn 2059-6464
dc.identifier.uri https://www.cambridge.org/core/journals/aeronautical-journal/article/on-and-offdesign-performance-of-a-model-rotating-turbine-with-nonaxisymmetric-endwall-contouring-and-a-comparison-to-cascade-data/7E4339E8C22E4782E63FD98DC9BCC54D
dc.identifier.uri DOI: https://doi.org/10.1017/aer.2018.13
dc.identifier.uri http://hdl.handle.net/10204/11061
dc.description Copyright: 2018 Cambridge University Press. This is the accepted version of the published item. en_US
dc.description.abstract Non-axisymmetric endwalls in turbine stages have shown to be a robust method to improve the performance of turbines in both power generation and aero-derivative applications. Non-axisymmetric endwalls target the control of secondary flows and are designed using detailed computational fluid dynamics coupled with a variety of optimisation algorithms and utilising a number of objective functions according to the engine company or researcher’s preference. These numerical predictions are often backed up by detailed measurements in linear and annular cascades and later proven in full scale engine tests. Relatively little literature is available describing their performance in rotating test rigs or at conditions other than design, apart from that of the authors. This study comprehensively revisits the low speed, model turbines used in the earlier study, replacing all of the 5-hole probe data with more accurate results and additional hot-film measurements. These results together with computational fluid dynamics solutions are used to show the success of the method across a large incidence range and to compare to earlier cascade results for a similar endwall and blade profile to establish the usefulness of cascade testing in this application. In addition a comparison to two other off-design studies is made. Results indicate that the end walls successfully improve the rotor total isentropic efficiency at all test conditions and that the improvement increases with increased turning in the blade row, from 0.5% to1.8% across the incidence range, The results also compare well to the estimation of isentropic efficiency improvement that can be drawn from the cascade testing which stands at 1.55%. en_US
dc.language.iso en en_US
dc.publisher Cambridge University Press en_US
dc.relation.ispartofseries Workflow;21954
dc.subject Non-axisymmetric endwall contouring en_US
dc.subject Secondary flows en_US
dc.subject Turbine efficiency en_US
dc.title On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data en_US
dc.type Article en_US
dc.identifier.apacitation Snedden, G. C., Dunn, D. I., & Ingram, G. (2018). On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data. http://hdl.handle.net/10204/11061 en_ZA
dc.identifier.chicagocitation Snedden, Glen C, Dwain I Dunn, and G Ingram "On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data." (2018) http://hdl.handle.net/10204/11061 en_ZA
dc.identifier.vancouvercitation Snedden GC, Dunn DI, Ingram G. On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data. 2018; http://hdl.handle.net/10204/11061. en_ZA
dc.identifier.ris TY - Article AU - Snedden, Glen C AU - Dunn, Dwain I AU - Ingram, G AB - Non-axisymmetric endwalls in turbine stages have shown to be a robust method to improve the performance of turbines in both power generation and aero-derivative applications. Non-axisymmetric endwalls target the control of secondary flows and are designed using detailed computational fluid dynamics coupled with a variety of optimisation algorithms and utilising a number of objective functions according to the engine company or researcher’s preference. These numerical predictions are often backed up by detailed measurements in linear and annular cascades and later proven in full scale engine tests. Relatively little literature is available describing their performance in rotating test rigs or at conditions other than design, apart from that of the authors. This study comprehensively revisits the low speed, model turbines used in the earlier study, replacing all of the 5-hole probe data with more accurate results and additional hot-film measurements. These results together with computational fluid dynamics solutions are used to show the success of the method across a large incidence range and to compare to earlier cascade results for a similar endwall and blade profile to establish the usefulness of cascade testing in this application. In addition a comparison to two other off-design studies is made. Results indicate that the end walls successfully improve the rotor total isentropic efficiency at all test conditions and that the improvement increases with increased turning in the blade row, from 0.5% to1.8% across the incidence range, The results also compare well to the estimation of isentropic efficiency improvement that can be drawn from the cascade testing which stands at 1.55%. DA - 2018-04 DB - ResearchSpace DP - CSIR KW - Non-axisymmetric endwall contouring KW - Secondary flows KW - Turbine efficiency LK - https://researchspace.csir.co.za PY - 2018 SM - 0001-9240 SM - 2059-6464 T1 - On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data TI - On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data UR - http://hdl.handle.net/10204/11061 ER - en_ZA


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