All Outputs (69)

Using Fluid Curtains to Improve Sealing Performance in Turbomachinery Applications (2024)
Journal Article

The results from an investigation into the physics of how fluid curtains can be applied to improve the aerodynamic performance of conventional turbomachinery shaft and rotor seals are described in this paper. Computational fluid dynamics and testing... Read More about Using Fluid Curtains to Improve Sealing Performance in Turbomachinery Applications.

Updating Turbomachinery Aerodynamics Teaching On an Undergraduate Course Using 3D Design Tools (2023)
Journal Article

This paper outlines the update of a turbomachinery course to cover 3D aerodynamics using a Reynolds Averaged-Navier Stokes solver. Prior to the activities outlined in this paper the course was taught in a conventional way with a series of lectures an... Read More about Updating Turbomachinery Aerodynamics Teaching On an Undergraduate Course Using 3D Design Tools.

The Significance of Bypass Transition on the Annual Energy Production of an Offshore Wind Turbine (2021)
Journal Article

Awareness of Leading-Edge Erosion (LEE) on wind turbine blades, and the impacts it can have on Annual Energy Production (AEP) have increased significantly over recent years. This is especially important in offshore environments, where a combination o... Read More about The Significance of Bypass Transition on the Annual Energy Production of an Offshore Wind Turbine.

Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control (2020)
Journal Article

S-duct diffusers are used in aircraft with embedded engines to route ambient air to the fan face. Sizing and stealth considerations drive a need for high curvature ducts, but the curvature causes complex secondary flows that lead to total pressure di... Read More about Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control.

A review of H-Darrieus wind turbine aerodynamic research (2019)
Journal Article

The H-Darrieus vertical axis turbine is one of the most promising wind energy converters for locations where there are rapid variations of wind direction, such as in the built environment. The most challenging considerations when employing one of the... Read More about A review of H-Darrieus wind turbine aerodynamic research.

Experimental study of the effects of turbine solidity, blade profile, pitch angle, surface roughness and aspect ratio on the H-Darrieus wind turbine self-starting and overall performance (2019)
Journal Article

New and comprehensive time‐accurate, experimental data from an H‐Darrieus wind turbine are presented to further develop our understanding of the performance of these turbines with a particular focus on self‐starting. The impact of turbine solid-ity,... Read More about Experimental study of the effects of turbine solidity, blade profile, pitch angle, surface roughness and aspect ratio on the H-Darrieus wind turbine self-starting and overall performance.

Time-accurate blade surface static pressure behaviour on a rotating H-Darrieus wind turbine (2019)
Journal Article

Time‐accurate blade pressure distributions on a rotating H‐Darrieus wind turbine at representative tip speed ratios during start‐up are presented here, which allow blade dynamic stall and laminar separation bubbles to be observed clearly and which pr... Read More about Time-accurate blade surface static pressure behaviour on a rotating H-Darrieus wind turbine.

Application of fluidic curtains to turbine rotor tip seal geometries. (2018)
Presentation / Conference Contribution

Fluidic curtain sealing has recently been shown to offer strong potential especially when a combination of fluidic curtain and a conventional labyrinth seal is used. A series of fundamental dimensionless ratios have been proposed and the design space... Read More about Application of fluidic curtains to turbine rotor tip seal geometries..

On- and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data (2018)
Journal Article

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 are des... Read More about On- and off-design performance of a model rotating turbine with non-axisymmetric endwall contouring and a comparison to cascade data.

Exploiting modern image processing in surface flow visualisation (2017)
Presentation / Conference Contribution

Surface flow visualisation is an experimental technique where the surface of interest is painted with an oil and dye mixture before a flow is applied to the object. In regions of high shear stress the oil/dye mixture is then removed and in regions of... Read More about Exploiting modern image processing in surface flow visualisation.

The Physics of H-Darrieus Turbine Starting Behavior (2015)
Journal Article

This paper provides a resolution to the contradictory accounts of whether or not the Darrieus turbine can self-start. The paper builds on previous work proposing an analogy between the aerofoil in Darrieus motion and flapping-wing flow mechanisms. Th... Read More about The Physics of H-Darrieus Turbine Starting Behavior.

Applying Wind Simulations for Planning and Operation of Real-Time Thermal Ratings (2015)
Journal Article

Real-time thermal ratings (RTTRs) are an emerging technology that allows the rating of electrical conductors to be estimated using real-time local weather observations. In many cases this leads to a very significant (typically 50%-100%) increase in r... Read More about Applying Wind Simulations for Planning and Operation of Real-Time Thermal Ratings.

The Impact of Diffuser Augmentation on a Tidal Stream Turbine (2015)
Journal Article

The results from an experimental study of a model diffuser augmented tidal stream turbine are presented with a particular focus on the impact of the diffuser upon the turbine׳s performance in yawed flows. This study is the first to examine yaw effect... Read More about The Impact of Diffuser Augmentation on a Tidal Stream Turbine.

Experimental Validation of a Curtain Type Fluidic Jet Seal on a Turbine Rotor Shroud (2015)
Presentation / Conference Contribution

This paper describes the design and testing of a fluidic “air-curtain” type seal application to reduce tip leakages on a small high-speed single stage axial turbine. The initial experimental investigations were carried out to demonstrate the applicat... Read More about Experimental Validation of a Curtain Type Fluidic Jet Seal on a Turbine Rotor Shroud.

A Dynamic Clearance Seal for Steam Turbine Application. (2015)
Presentation / Conference Contribution

Effective sealing in turbomachinery reduces the leakage flow bypassing the turbine blades and also reduces the losses where the leakage flow mixes with the primary flow. In general the clearance should be as small as possible but is limited by therma... Read More about A Dynamic Clearance Seal for Steam Turbine Application..

Investigating Endwall-Blade Fillet Radius Variation to Reduce Secondary Flow Losses (2015)
Presentation / Conference Contribution

In turbomachinery the joint between a turbine blade and the endwall often involves a fillet. Previous studies show that this fillet significantly influences the secondary flows despite regularly being omitted from simulation and testing, specifically... Read More about Investigating Endwall-Blade Fillet Radius Variation to Reduce Secondary Flow Losses.

Efficient Methods for Predicting Low Pressure Steam Turbine Exhaust Hood and Diffuser Flows at Design and Off-Design Conditions (2015)
Journal Article

The exhaust hood of a steam turbine is an important area of turbomachinery research as its performance strongly influences the power output of the last stage blades (LSB). This paper compares results from 3D simulations using a novel application of t... Read More about Efficient Methods for Predicting Low Pressure Steam Turbine Exhaust Hood and Diffuser Flows at Design and Off-Design Conditions.

A Comparison of Real Time Thermal Rating Systems in the U.S. and the UK (2014)
Journal Article

Real-Time Thermal Rating is a smart grid technology that allows the rating of electrical conductors to be increased based on local weather conditions. Overhead lines are conventionally given a conservative, constant seasonal rating based on seasonal... Read More about A Comparison of Real Time Thermal Rating Systems in the U.S. and the UK.

Secondary Flows and Fillet Radii in a Linear Turbine Cascade (2014)
Presentation / Conference Contribution

Most large scale cascade experiments and the corresponding computational fluid dynamics are conducted on geometries without fillet radii, that is with sharp edges. Despite that the fact that all real machines have a fillet radii there has not so far... Read More about Secondary Flows and Fillet Radii in a Linear Turbine Cascade.

The Physics of H-Darrieus Turbine Starting Behaviour (2014)
Presentation / Conference Contribution

This paper investigates Darrieus turbine starting behaviour and provides a resolution to the contradictory accounts of whether or not the Darrieus turbine can self-start. The paper builds on previous work proposing an analogy between the aerofoil in... Read More about The Physics of H-Darrieus Turbine Starting Behaviour.