Snedden, Glen CDunn, Dwain IVon Backström, TWIngram, G2010-02-102010-02-102010-01Snedden, GC, Dunn, D et al. 2010. Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics. 7th South African Conference on Computational and Applied Mechanics (SACAM10). Pretoria, 10-13 January 2010, pp 1-15http://hdl.handle.net/10204/39397th South African Conference on Computational and Applied Mechanics (SACAM10)This study examines the results of a CFD and rotating experiment, comparing an annular and a generic end wall design for a model turbine rotor in a 1½ stage turbine at the CSIR, in an attempt to draw some conclusions regarding the proper selection of objective functions during the optimisation process. The CSIR has a rich body of experimental and computational data from a rotating test rig with both profiled and planar end walls, which provides an ideal opportunity to examine the validity of various objective functions. A 1½ stage, low speed, turbine test rig, originally of the University of Natal, where it was used for tip loss measurements, has been installed and refurbished at the CSIR. In Figure 3 the general layout and instrumentation of the test rig is indicated. The test rig has a hub and tip radius of 0.142 m and 0.203 m respectively and is designed for a maximum wheel speed of 3000 RPM. A radial fan draws atmospheric air through the rig, inducing a pressure drop of 4.8 kPa for a mass-flow of 3.39 kg/s, corresponding to an inlet velocity of about 30 m/s. The radial fan is driven by an electric motor with variable speed control. The turbine power is absorbed by a hydraulic motor, giving independent rotor speed control. Inlet turbulence intensity was measured to be less than 1%.enTurbineNon-axisymmetricEndwallSecondary flowsTurbine test rigComputational fluid dynamicsConference PresentationSnedden, G. C., Dunn, D. I., Von Backström, T., & Ingram, G. (2010). Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics. South African Conference on Computational and Applied Mechanics. http://hdl.handle.net/10204/3939Snedden, Glen C, Dwain I Dunn, TW Von Backström, and G Ingram. "Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics." (2010): http://hdl.handle.net/10204/3939Snedden GC, Dunn DI, Von Backström T, Ingram G, Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics; South African Conference on Computational and Applied Mechanics; 2010. http://hdl.handle.net/10204/3939 .TY - Conference Presentation AU - Snedden, Glen C AU - Dunn, Dwain I AU - Von Backström, TW AU - Ingram, G AB - This study examines the results of a CFD and rotating experiment, comparing an annular and a generic end wall design for a model turbine rotor in a 1½ stage turbine at the CSIR, in an attempt to draw some conclusions regarding the proper selection of objective functions during the optimisation process. The CSIR has a rich body of experimental and computational data from a rotating test rig with both profiled and planar end walls, which provides an ideal opportunity to examine the validity of various objective functions. A 1½ stage, low speed, turbine test rig, originally of the University of Natal, where it was used for tip loss measurements, has been installed and refurbished at the CSIR. In Figure 3 the general layout and instrumentation of the test rig is indicated. The test rig has a hub and tip radius of 0.142 m and 0.203 m respectively and is designed for a maximum wheel speed of 3000 RPM. A radial fan draws atmospheric air through the rig, inducing a pressure drop of 4.8 kPa for a mass-flow of 3.39 kg/s, corresponding to an inlet velocity of about 30 m/s. The radial fan is driven by an electric motor with variable speed control. The turbine power is absorbed by a hydraulic motor, giving independent rotor speed control. Inlet turbulence intensity was measured to be less than 1%. DA - 2010-01 DB - ResearchSpace DP - CSIR KW - Turbine KW - Non-axisymmetric KW - Endwall KW - Secondary flows KW - Turbine test rig KW - Computational fluid dynamics LK - https://researchspace.csir.co.za PY - 2010 T1 - Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics TI - Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics UR - http://hdl.handle.net/10204/3939 ER -