Unsteady analysis of a generic non-axisymmetric hub endwall contour as applied to a rotating turbine at on and off- design conditions

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dc.contributor.authorDunn, D. I.en_ZA
dc.contributor.authorVon Backstrom, T. W.en_ZA
dc.contributor.authorSneddenc, G. C.en_ZA
dc.date.accessioned2020-01-31T12:35:41Z
dc.date.available2020-01-31T12:35:41Z
dc.date.issued2018
dc.descriptionCITATION: Dunn, D. I., Von Backstrom, T. W. & Sneddenc, G. C. 2018. Unsteady analysis of a generic non-axisymmetric hub endwall contour as applied to a rotating turbine at on and off- design conditions. R & D Journal of the South African Institution of Mechanical Engineering, 34:53-60.
dc.descriptionThe original publication is available at https://www.saimeche.org.za
dc.description.abstractNumerous researchers have investigated various techniques to reduce loss in gas turbine engines. One such technique that has shown promise is endwall secondary flow control using non-axisymmetric endwall contouring. Previous steady state investigations have shown that the generic endwall contour designed for a cascade reduced the loss in a rotating turbine test rig. The current investigation was to determine if there were unsteady effects introduced by the contour at design and off design conditions. An experimental and numerical study was performed to investigate the rotor flow field for any unsteady changes to the rotor exit flow field. The investigation was performed at an increased loading condition, design and a decreased loading condition to determine how changes in operating condition altered the flow field. The experimental results showed that the velocity magnitude of the hub endwall secondary flow vortex system for the contoured rotor was reduced. The peak difference in oscillation of the flow was also reduced. The effect of the endwall contour reduced the over and under turning of the endwall secondary flow vortex system as well. The magnitude of the FFT at the blade passing frequency was reduced below midspan.en_ZA
dc.description.urihttps://www.saimeche.org.za/page/RD_2018?&hhsearchterms=%22unsteady+and+analysis+and+generic+and+non-axisymmetric+and+hub+and+endwall+and+contour+and+applied+and+rotating+and+turbine%22&#rescol_5202677
dc.description.versionPublisher's version
dc.format.extent8 pages
dc.identifier.citationDunn, D. I., Von Backstrom, T. W. & Sneddenc, G. C. 2018. Unsteady analysis of a generic non-axisymmetric hub endwall contour as applied to a rotating turbine at on and off- design conditions. R & D Journal of the South African Institution of Mechanical Engineering, 34:53-60
dc.identifier.issn2309-8988 (online)
dc.identifier.issn0257-9669 (print)
dc.identifier.urihttp://hdl.handle.net/10019.1/107409
dc.language.isoen_ZAen_ZA
dc.publisherSAIMechE
dc.rights.holderSAIMechE
dc.subjectNon-axisymmetric endwallsen_ZA
dc.subjectGas turbines -- Performanceen_ZA
dc.subjectPumping machinery -- Performanceen_ZA
dc.subjectUnsteady flow (Fluid dynamics)en_ZA
dc.subjectAxial flowen_ZA
dc.titleUnsteady analysis of a generic non-axisymmetric hub endwall contour as applied to a rotating turbine at on and off- design conditionsen_ZA
dc.typeArticleen_ZA
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