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Browsing by Author "Snedden, Glen C"

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Application of transition modelling in CFD for use with turbine blades

Author: Dunn, Dwain I ; Snedden, Glen C ; Roos, T ; Hildebrandt, T Date: Sep 2011 The design of internally-cooled gas turbine blades requires accurate predictions of distributions of blade temperature values and temperature gradients. This requires accurate predictions of heat transfer distributions from the hot gas (on ... Read more
CFD analysis of the impingement cooling effect of the coolant jet caused by the T56 1st stage disc metering hole

Author: Snedden, Glen C ; Lambert, T Date: Sep 2003 This investigation examines the results of the CFD analysis of the effect of coolant impingement on the back of a disc (or wheel) as part of the secondary cooling circuit of the T56-A-15LFE turboprop engine. As part of the collaborative study ... Read more
CFD model of a spinning pipe gas lens

Author: Snedden, Glen C ; Forbes, A ; Mahlatse, ACK ; Mafusire, C ; Michaelis, MM Date: Jul 2006 Slides on: Spinning Pipe Gas Lens; Focal Length; Refractive Index; Gas Dynamics; Guess at the gas dynamics; Density Profile; Flow Profile; Rosby Waves; Rayleigh–Taylor Instabilities Read more
Characterisation of a refurbished 1½ stage turbine test rig for flowfield mapping behind blading with non-axisymmetric contoured endwalls

Author: Snedden, Glen C ; Roos, TH ; Dunn, Dwain I ; Gregory-Smith, D Date: Sep 2007 This paper describes the results, to date, of collaboration between the CSIR (South Africa) and Durham University (UK). Furthermore the paper intends to demonstrate the capability and suitability of a refurbished 1½ stage turbine test rig to ... Read more
Characterisation of a spinning pipe gas lens using a Shack–Hartmann wavefront sensor

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C ; Michaelis, MM Date: 2007 A heated horizontal spinning pipe causes gases inside it to assume dynamics resulting in a graded index lens – a spinning pipe gas lens (SPGL). A CFD model is presented which shows that gas exchanges of the SPGL with the surroundings resulting ... Read more
Computational fluid dynamics model of the spinning pipe gas lens

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C Date: Aug 2010 When a metal horizontal pipe is heated and spun along its axis, a graded refractive index distribution is generated which is can be used as a lens, thus its name, the spinning pipe gas lens (SPGL). Previous experimental results of its performance ... Read more
The design of a kerosene turbopump for a South African commercial launch vehicle

Author: Snedden, Glen C ; Smyth, J ; Bindon, J ; Brooks, M ; Smith, G Date: Aug 2012 A South African turbopump design capability would be critical to any future indigenous commercial launch capacity. This paper describes the initial work being done at the University of KwaZulu-Natal (UKZN) to design a kerosene turbopump for ... Read more
Detailed disc assembly temperature prediction: comparison between CFD and simplified engineering methods

Author: Snedden, Glen C ; Roos, TH ; Naidoo, Kavendra Date: Sep 2003 Previous simulations of a turbojet disc cavity with full Navier-Stokes CFD and simplified geometry and boundary conditions have been improved to reduce the level of approximation. A new grid was built using a multi-block approach. The case ... Read more
The development of an air injection system for the forced response testing of axial compressors

Author: Wegman, Erik J ; Snedden, Glen C ; Holzinger, F ; Schiffer, HP ; Van der Spuy, SJ ; Mårtensson, H ; Ostlund, J Date: Jun 2013 A phase-controllable, air injection exciter system was developed to enable measurement of the forced response properties of a transonic axial compressor blisk. The project was performed as part of the FP7 European framework program project ... Read more
Development of an automated non-axisymmetric endwall contour design system for the rotor of a 1-stage research turbine - Part 1 System Design

Author: Bergh, J ; Snedden, Glen C ; Reddy, D Date: Sep 2019 Secondary flows are a well-known source of loss in turbomachinery flows, contributing up to 30% of the total aerodynamic blade row loss. With the increase in pressure on aero-engine manufacturers to produce lighter, more powerful and increasingly ... Read more
Development of an automated non-axisymmetric endwall contour design system for the rotor of a 1-stage research turbine - Part 2 Computed and experimental results

Author: Bergh, J ; Snedden, Glen C ; Reddy, D Date: Jan 2020 Non-axisymmetric endwall contouring is a mechanism which attempts to reduce the negative effects of secondary ows in compressor and turbine blade rows by allowing the otherwise cylindrical turbine endwalls to take on threedimensional (and ... Read more
Effect of laser shock peening on fatigue life at stress raiser regions of a high-speed micro gas turbine shaft: A simulation based study

Author: Pretorius, JG ; Desai, DA ; Snedden, Glen C Date: Nov 2019 Fatigue failure due to stress raiser regions on critical rotating components in gas turbine engines, such as the shaft, is a crucial aspect. Methods to reduce these stresses and improve fatigue life are a source of ongoing research. Laser ... Read more
Experimental and numerical study of near bleed hole heat transfer enhancement in internal turbine blade cooling channels

Author: Scheepers, G ; Morris, RM ; Visser, JA ; Roos, TH ; Snedden, Glen C Date: Jan 2006 This paper describes an experimental and numerical study of the heat transfer augmentation near the entrance to a gas turbine film cooling hole at different engine representative suction ratios (Vhole/V). For the experimental component the ... Read more
Experimental investigation into the unsteady effects on non-axisymmetric turbine endwall contouring

Author: Dunn, Dwain I ; Snedden, Glen C ; Von Backström, TW Date: Jan 2010 Turbine manufacturers are striving to develop turbines that are more efficient. One area of focus has been the control of secondary flows through the use of non-axisymmetric endwalls. The majority of development has been performed in cascades ... Read more
Experimental results showing the internal three-component velocity field and outlet temperature contours for a model gas turbine combustor

Author: Meyers, BC ; Snedden, Glen C ; Meyers, Bronwyn C ; Roos, TH ; Mahmood, GI Date: Sep 2011 A three-component flow field inside a can-type, forward flow experimental combustor was measured under non-reacting conditions. The combustor was run at atmospheric conditions with the air flow supplied from a fan and the outlet was straight ... Read more
Gas lensing in a heated spinning pipe

Author: Mafusire, C ; Forbes, A ; Snedden, Glen C ; Mahlase, Andrew CK ; Michaelis, MM ; Mathuthu, M Date: Jul 2006 When a heated pipe is rotated, the dynamics of the gas inside exhibit properties reminiscent of a solid-state positive lens. The properties are a result of a parabolic distribution of refractive index in the pipe which is caused by mixing of ... Read more
Inclusive vision for high performance computing at the CSIR

Author: Gazendam, A ; Bosscha, Peter A ; Donovan, S ; Eksteen, J ; Haarhof, J ; Horn, U ; Mahlase, C ; Matthee, Karel W ; Naidoo, T ; Snedden, Glen C ; Van Niekerk, H ; Vogt, D Date: Feb 2006 Scientists doing research in fields ranging from genomics to astronomy are facing various challenges. The use of digital technology to enhance existing research efforts and enable new types of research not imaginable before is slowly but ... Read more
Observations on the selection of objective function for the optimisation of turbine endwalls using computational fluid dynamics

Author: Snedden, Glen C ; Dunn, Dwain I ; Von Backström, TW ; Ingram, G Date: Jan 2010 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 ... Read more
On-and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data

Author: Snedden, Glen C ; Dunn, Dwain I ; Ingram, G Date: Apr 2018 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 ... Read more
Optical aberrations in a gas lenses

Author: Mafusire, C ; Forbes, A ; Michaelis, MM ; Snedden, Glen C Date: Aug 2010 Gas lenses work on the basis that aerodynamic media can be used to generate a graded refractive index distribution which can be used to focus a laser beam. Examples of these are the spinning pipe gas lens (SPGL) and the flame lens (FL). The ... Read more

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