The Experts below are selected from a list of 29055 Experts worldwide ranked by ideXlab platform
M L G Oldfield - One of the best experts on this subject based on the ideXlab platform.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 1
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:This paper is the first of three, which outline the procedures and results for a set of experiments carried out on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester-Betz limit for kinetic efficiency by using high blockage. This paper covers the experimental procedures and results for the hydrodynamic performance for the parallel bladed variant of the THAWT device. The second paper covers the hydrodynamic loading of the parallel bladed rotor and the third covers both hydrodynamic performance and loading of the truss configured THAWT device.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 3
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:Abstract This paper is the third of three, which describe the procedures and results for a set of experiments on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed-controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester–Betz limit for kinetic efficiency by using high blockage. This paper covers the instrumentation, hydrodynamic performance and loading of the truss bladed variant of the THAWT device. The first paper covers the experimental setup and hydrodynamic performance of the parallel bladed rotor and the second paper covers the instrumentation and hydrodynamic loading of the parallel bladed rotor.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 2
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:Abstract This paper is the second of three, which outline the procedures and results for a set of experiments on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester–Betz limit for kinetic efficiency, by exploiting high blockage. This second paper covers the instrumentation and analysis for the structural loading for the parallel bladed variant of the THAWT device. The first paper covers the experimental setup and hydrodynamic performance of the parallel bladed rotor, and the third paper covers both performance and loading of the truss configured THAWT device.
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experimental testing of the transverse horizontal axis Water Turbine
Iet Renewable Power Generation, 2010Co-Authors: Ross A Mcadam, M L G Oldfield, Guy T. Houlsby, Malcolm MccullochAbstract:This study outlines the procedures and results for a set of experiments on the transverse horizontal axis Water Turbine (THAWT), which is a variant of a Darrieus Turbine. Testing of a 1/20th scale device was conducted in the combined wind, wave and current tank at Newcastle University. Flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of the THAWT design. Variants included a parallel-bladed device, a `truss` device and a parallel-bladed device configured with blades pitched relative to the pitch circle tangent. Experiments were carried out using a speed controlled motor, allowing quasi-steady results to be taken over a range of tip speed ratios. The results demonstrate that, over a range of flow conditions, the device is capable of exceeding the Lanchester`Betz limit for kinetic efficiency. This is principally because of the relatively high blockage ratio that can be achieved with such a device.
Ross A Mcadam - One of the best experts on this subject based on the ideXlab platform.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 1
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:This paper is the first of three, which outline the procedures and results for a set of experiments carried out on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester-Betz limit for kinetic efficiency by using high blockage. This paper covers the experimental procedures and results for the hydrodynamic performance for the parallel bladed variant of the THAWT device. The second paper covers the hydrodynamic loading of the parallel bladed rotor and the third covers both hydrodynamic performance and loading of the truss configured THAWT device.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 3
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:Abstract This paper is the third of three, which describe the procedures and results for a set of experiments on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed-controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester–Betz limit for kinetic efficiency by using high blockage. This paper covers the instrumentation, hydrodynamic performance and loading of the truss bladed variant of the THAWT device. The first paper covers the experimental setup and hydrodynamic performance of the parallel bladed rotor and the second paper covers the instrumentation and hydrodynamic loading of the parallel bladed rotor.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 2
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:Abstract This paper is the second of three, which outline the procedures and results for a set of experiments on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester–Betz limit for kinetic efficiency, by exploiting high blockage. This second paper covers the instrumentation and analysis for the structural loading for the parallel bladed variant of the THAWT device. The first paper covers the experimental setup and hydrodynamic performance of the parallel bladed rotor, and the third paper covers both performance and loading of the truss configured THAWT device.
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experimental testing of the transverse horizontal axis Water Turbine
Iet Renewable Power Generation, 2010Co-Authors: Ross A Mcadam, M L G Oldfield, Guy T. Houlsby, Malcolm MccullochAbstract:This study outlines the procedures and results for a set of experiments on the transverse horizontal axis Water Turbine (THAWT), which is a variant of a Darrieus Turbine. Testing of a 1/20th scale device was conducted in the combined wind, wave and current tank at Newcastle University. Flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of the THAWT design. Variants included a parallel-bladed device, a `truss` device and a parallel-bladed device configured with blades pitched relative to the pitch circle tangent. Experiments were carried out using a speed controlled motor, allowing quasi-steady results to be taken over a range of tip speed ratios. The results demonstrate that, over a range of flow conditions, the device is capable of exceeding the Lanchester`Betz limit for kinetic efficiency. This is principally because of the relatively high blockage ratio that can be achieved with such a device.
Guy T. Houlsby - One of the best experts on this subject based on the ideXlab platform.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 1
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:This paper is the first of three, which outline the procedures and results for a set of experiments carried out on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester-Betz limit for kinetic efficiency by using high blockage. This paper covers the experimental procedures and results for the hydrodynamic performance for the parallel bladed variant of the THAWT device. The second paper covers the hydrodynamic loading of the parallel bladed rotor and the third covers both hydrodynamic performance and loading of the truss configured THAWT device.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 3
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:Abstract This paper is the third of three, which describe the procedures and results for a set of experiments on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed-controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester–Betz limit for kinetic efficiency by using high blockage. This paper covers the instrumentation, hydrodynamic performance and loading of the truss bladed variant of the THAWT device. The first paper covers the experimental setup and hydrodynamic performance of the parallel bladed rotor and the second paper covers the instrumentation and hydrodynamic loading of the parallel bladed rotor.
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experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis Water Turbine part 2
Renewable Energy, 2013Co-Authors: Ross A Mcadam, Guy T. Houlsby, M L G OldfieldAbstract:Abstract This paper is the second of three, which outline the procedures and results for a set of experiments on various configurations of the Transverse Horizontal Axis Water Turbine (THAWT), which is a horizontally orientated variant of the Darrieus cross-flow Turbine. Tests were conducted in the combined wind, wave and current tank at Newcastle University on a 0.5 m diameter rotor, while the flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of varied blade pitch, rotor solidity, blockage ratio and truss oriented blades. Experiments were carried out using a speed controlled motor/generator, allowing quasi-steady results to be taken over a range of tip speed ratios. Measurements of power, thrust, blade loading and free surface deformation provide extensive data for future validation of numerical codes and demonstrate the ability of the device to exceed the Lanchester–Betz limit for kinetic efficiency, by exploiting high blockage. This second paper covers the instrumentation and analysis for the structural loading for the parallel bladed variant of the THAWT device. The first paper covers the experimental setup and hydrodynamic performance of the parallel bladed rotor, and the third paper covers both performance and loading of the truss configured THAWT device.
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experimental testing of the transverse horizontal axis Water Turbine
Iet Renewable Power Generation, 2010Co-Authors: Ross A Mcadam, M L G Oldfield, Guy T. Houlsby, Malcolm MccullochAbstract:This study outlines the procedures and results for a set of experiments on the transverse horizontal axis Water Turbine (THAWT), which is a variant of a Darrieus Turbine. Testing of a 1/20th scale device was conducted in the combined wind, wave and current tank at Newcastle University. Flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of the THAWT design. Variants included a parallel-bladed device, a `truss` device and a parallel-bladed device configured with blades pitched relative to the pitch circle tangent. Experiments were carried out using a speed controlled motor, allowing quasi-steady results to be taken over a range of tip speed ratios. The results demonstrate that, over a range of flow conditions, the device is capable of exceeding the Lanchester`Betz limit for kinetic efficiency. This is principally because of the relatively high blockage ratio that can be achieved with such a device.
Malcolm Mcculloch - One of the best experts on this subject based on the ideXlab platform.
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experimental testing of the transverse horizontal axis Water Turbine
Iet Renewable Power Generation, 2010Co-Authors: Ross A Mcadam, M L G Oldfield, Guy T. Houlsby, Malcolm MccullochAbstract:This study outlines the procedures and results for a set of experiments on the transverse horizontal axis Water Turbine (THAWT), which is a variant of a Darrieus Turbine. Testing of a 1/20th scale device was conducted in the combined wind, wave and current tank at Newcastle University. Flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of the THAWT design. Variants included a parallel-bladed device, a `truss` device and a parallel-bladed device configured with blades pitched relative to the pitch circle tangent. Experiments were carried out using a speed controlled motor, allowing quasi-steady results to be taken over a range of tip speed ratios. The results demonstrate that, over a range of flow conditions, the device is capable of exceeding the Lanchester`Betz limit for kinetic efficiency. This is principally because of the relatively high blockage ratio that can be achieved with such a device.
Daniel Roye - One of the best experts on this subject based on the ideXlab platform.
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Synchronized Control Of Cross-Flow-Water-Turbine-Based Twin Towers
Renewable Energy, 2012Co-Authors: Maria Vallet, Seddik Bacha, Iulian Munteanu, Antoneta Iuliana Bratcu, Daniel RoyeAbstract:This paper deals with a renewable energy conversion system based on cross-flow Water Turbines operating in a river stream. Two twin vertical towers, each of which is composed of four such Turbines, need to meet an imposed restriction between their angular positions (synchronization) in order to achieve improved hydrodynamic performances. The synchronization is achieved by a control approach, without using any power coupling (mechanical or electrical) between the two towers. As each tower is equipped with a permanent-magnet synchronous generator which delivers electrical power to the grid through a back-to-back power electronics converter, their rotational speeds can be controlled such that to achieve angular position synchronization. Being similar to the phase-locked loop devices used in electronics, the proposed method has been tested on a power hardware-in-the-loop simulator dedicated to cross-flow Water Turbines and proved good potential for being easily and effectively used in practice due to its simplicity and reliability.
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Micro-Hydro Water Current Turbine Control for Grid Connected or Islanding Operation
2008Co-Authors: Ana-maria Andreica, Seddik Bacha, Daniel Roye, Ion Exteberria-otadui, Iulian MunteanuAbstract:This paper deals with the up-to-date issue of renewable energy production systems. For their exploitation these systems need advanced integrated controls that include power electronics facilities. A study of a microhydro Water Turbine based energy production system is presented1. This study is oriented on controlling the microhydro generation system in grid-connected and in islanded operation. For each of this two operation modes, the roles of power electronics converters have been assigned and control structures have been proposed. Simulations and experimental tests have been realized to verify the feasibility of the system and the response of the control loops.
