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Large tip clearance flows in two compressor cascades (2010)
Presentation / Conference Contribution
Williams, R., Ingram, G., & Gregory-Smith, D. (2010). Large tip clearance flows in two compressor cascades. In ASME Turbo Expo 2010 : Power for land, sea and air, 14-18 June 2010, Glasgow ; proceedings (391-402). https://doi.org/10.1115/gt2010-22952

Large tip clearances in the region of six percent span exist in the high pressure stages of compressors of industrial gas turbines. The over tip clearance flow causes significant block-age and accounts for the largest proportion of loss in the high pre... Read More about Large tip clearance flows in two compressor cascades.

Experiments and Computations on Large Tip Clearance Effects in a Linear Cascade (2010)
Journal Article
Williams, R., Gregory-Smith, D., He, L., & Ingram, G. (2010). Experiments and Computations on Large Tip Clearance Effects in a Linear Cascade. Journal of Turbomachinery, 132(2), Article 021018. https://doi.org/10.1115/1.3104611

Large tip clearances typically in the region of 6% exist in the high pressure (HP) stages of compressors of industrial gas turbines. Due to the relatively short annulus height and significant blockage, the tip clearance flow accounts for the largest... Read More about Experiments and Computations on Large Tip Clearance Effects in a Linear Cascade.

Endwall Profile Design for the Durham Cascade using Genetic Algorithms (2010)
Presentation / Conference Contribution
MacPherson, R., & Ingram, G. (2010). Endwall Profile Design for the Durham Cascade using Genetic Algorithms.

This paper describes a system for designing profiled endwalls for the Durham Cascade, a well known turbomachinery test case. A genetic algorithm coupled with “off the shelf” software was used, a commercial flow solver (Fluent) was used to run the des... Read More about Endwall Profile Design for the Durham Cascade using Genetic Algorithms.

The Application of Non-axisymmetric Endwall Contouring in a Single Stage, Rotating Turbine (2009)
Presentation / Conference Contribution
Snedden, G., Dunn, D., Ingram, G., & Gregory-Smith, D. (2009). The Application of Non-axisymmetric Endwall Contouring in a Single Stage, Rotating Turbine.

As turbine manufacturers strive to develop machines that are more efficient, one area of focus has been the control of secondary flows. To a large extent these methods have been developed through the use of computational fluid dynamics and detailed m... Read More about The Application of Non-axisymmetric Endwall Contouring in a Single Stage, Rotating Turbine.

Vorticity Development in Highly Loaded Cascade Blades (2009)
Presentation / Conference Contribution
Bagshaw, D., Ingram, G., Gregory-Smith, D., & Atkins, W. (2009). Vorticity Development in Highly Loaded Cascade Blades. In F. Heitmeir, F. Martelli, & M. Manna (Eds.), 8th European Conference on Turbomachinery : fluid dynamics and thermodynamics (EUROTURBO 8), 23-27 March 2009, Graz, Austria ; proceedings (1277-1287)

A number of innovative techniques to reduce secondary flow, such as profiled endwalls and passage shaping have been proposed in recent years. This paper demonstrates how examining vorticity development through a highly loaded cascade can enhance the... Read More about Vorticity Development in Highly Loaded Cascade Blades.

Large Tip Clearances and Highly Skewed Inlet Conditions (2009)
Presentation / Conference Contribution
Williams, R., Gregory-Smith, D., & Ingram, G. (2009). Large Tip Clearances and Highly Skewed Inlet Conditions. In F. Heitmeir, F. Martelli, & M. Manna (Eds.), 8th European Conference on Turbomachinery : fluid dynamics and thermodynamics (EUROTURBO 8), 23-27 March 2009, Graz, Austria ; proceedings (355-366)

Multi stage and end-wall effects result in a highly skewed inlet boundary layer to high pressure axial compressor rotor rows, this paper investigates the influence of these skewed boundary layers on tip clearance flows. The particular focus is on com... Read More about Large Tip Clearances and Highly Skewed Inlet Conditions.

Darrieus turbines: the physics of self-starting (2009)
Journal Article
Hill, N., Dominy, R., Ingram, G., & Dominy, J. (2009). Darrieus turbines: the physics of self-starting. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 223(1), 21-29. https://doi.org/10.1243/09576509jpe615

As the demand for renewable energy grows, the use of small wind turbines becomes increasingly attractive. Turbines using vertical-axis geometries are particularly suited to the urban environment by virtue of their operation being independent of wind... Read More about Darrieus turbines: the physics of self-starting.

Using Profiled Endwalls, Blade Lean and Leading Edge Extensions to Minimize Secondary Flow. (2008)
Presentation / Conference Contribution
Gregory-Smith, D., Bagshaw, D., Ingram, G., & Stokes, M. (2008). Using Profiled Endwalls, Blade Lean and Leading Edge Extensions to Minimize Secondary Flow. . https://doi.org/10.1115/gt2008-50811

Methods to reduce secondary flows and losses in turbines have been studied for many years. This paper presents the latest results from a series of projects using profiled end walls, blade lean and modifying the blade profile near the end wall. In add... Read More about Using Profiled Endwalls, Blade Lean and Leading Edge Extensions to Minimize Secondary Flow..

Experiments and Computations on Large Tip Clearance Effects in a Linear Cascade (2008)
Presentation / Conference Contribution
Williams, R., Gregory-Smith, D., He, L., & Ingram, G. (2008). Experiments and Computations on Large Tip Clearance Effects in a Linear Cascade. In ASME Turbo Expo 2008 : power for land, sea and air, 9-13 June 2008, Berlin, Germany ; proceedings (335-347). https://doi.org/10.1115/gt2008-50557

Large tip clearances typically in the region of six percent exist in the high pressure stages of compressors of industrial gas turbines. Due to the relatively short annulus height and significant blockage, the tip clearance flow accounts for the larg... Read More about Experiments and Computations on Large Tip Clearance Effects in a Linear Cascade.

The design of three-dimensional turbine blades combined with profiled endwalls (2008)
Journal Article
Bagshaw, D., Ingram, G., Gregory-Smith, D., Stokes, M., & Harvey, N. (2008). The design of three-dimensional turbine blades combined with profiled endwalls. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 222(1), 93-102. https://doi.org/10.1243/09576509jpe477

This paper describes a novel design for reducing secondary flow in turbines. The design builds on previous work on non-axisymmetric profiled endwalls by combining them with three-dimensional blade design. Profiled endwalls have been shown to effectiv... Read More about The design of three-dimensional turbine blades combined with profiled endwalls.

An experimental study of three-dimensional turbine blades combined with profiled endwalls (2008)
Journal Article
Bagshaw, D., Ingram, G., Gregory-Smith, D., & Stokes, M. (2008). An experimental study of three-dimensional turbine blades combined with profiled endwalls. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 222(1), 103-110. https://doi.org/10.1243/09576509jpe478

This paper presents a detailed series of measurements on a novel design for reducing secondary flow in a linear cascade. The design of this geometry, which features profiled endwalls and three-dimensional blade shaping was discussed in a companion pa... Read More about An experimental study of three-dimensional turbine blades combined with profiled endwalls.

An experimental study of reverse compound lean in a linear turbine cascade (2005)
Journal Article
Bagshaw, D., Ingram, G., Gregory-Smith, D., & Stokes, M. (2005). An experimental study of reverse compound lean in a linear turbine cascade. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 219(6), 443-449. https://doi.org/10.1243/095765005x31199

This paper describes a detailed experimental investigation into the effects of reverse compound lean (RCL) in a highly loaded axial turbine cascade. The geometry was designed using fully three-dimensional viscous CFD calculations to achieve a reducti... Read More about An experimental study of reverse compound lean in a linear turbine cascade.