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Browsing by Author "Dunn, Dwain I"

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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
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
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
Impact of environmental certification on the South African forest products supply chain

Author: Dunn, Dwain I Date: 2000 This study traces the route of FSC certified timber from mill to market, seeking to understand the impact of certification on traders and retailers in South Africa and the UK Read more
Numerical investigation into the unsteady effects of non-axisymmetric turbine endwall contouring on secondary flows

Author: Dunn, Dwain I ; Von Backström, TW Date: Aug 2011 Turbine manufacturers are continually striving to improve turbine performance, and thus reduce emissions, which has been accelerated with the inception of the Kyoto protocol. One of the areas that have received attention is the controlling ... 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
Performance of a generic non-axisymmetric end wall in a single stage, rotating turbine at on and off-design conditions

Author: Snedden, Glen C ; Dunn, Dwain I ; Ingram, G ; Gregory-Smith, D Date: Jun 2010 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 ... Read more
Turbulence model comparisons for a low pressure 1.5 stage test turbine

Author: Dunn, Dwain I ; Snedden, Glen C ; Von Backström, TW Date: Sep 2009 In a gas turbine engine secondary flows have a detrimental effect on efficiency. The current numerical study is aimed at determining which turbulence model in a commercially available CFD code is best suited to predicting the secondary flows. ... Read more

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Browsing by Author "Dunn, Dwain I"

Browsing by Author "Dunn, Dwain I"

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