The Experts below are selected from a list of 297 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, G 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, G T Houlsby, M L G OldfieldAbstract: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.
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, G 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, G T Houlsby, M L G OldfieldAbstract: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.
G 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, G 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, G T Houlsby, M L G OldfieldAbstract: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.
Yin L. Young - One of the best experts on this subject based on the ideXlab platform.
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Utilization of bend-twist coupling for performance enhancement of composite marine propellers
Journal of Fluids and Structures, 2009Co-Authors: Zhanke Liu, Yin L. YoungAbstract:Self-twisting composite marine propellers, when subject to Hydrodynamic Loading, will not only automatically bend but also twist due to passive bend-twist (BT) coupling characteristics of anisotropic composites. To exploit the BT coupling effects of self-twisting propellers, a two-level (material and geometry) design methodology is proposed, formulated, and implemented. The material design is formulated as a constrained, discrete, binary optimization problem, which is tackled using an enhanced genetic algorithm equipped with numerical and analytical tools as function evaluators. The geometry design is formulated as an inverse problem to determine the unloaded geometry, which is solved using an over-relaxed, nonlinear, iterative procedure. A sample design is provided to illustrate the design methodology, and the predicted performance is compared to that of a rigid propeller. The results show that the self-twisting propeller produced the same performance as the rigid propeller at the design flow condition, and it produced better performance than the rigid propeller at off-design flow conditions, including behind a spatially varying wake. © 2009 Elsevier Ltd. All rights reserved.
Daniel Nematy - One of the best experts on this subject based on the ideXlab platform.
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Hydro-Structure Analysis of Composite Marine Propeller under Pressure Hydrodynamic Loading
American Journal of Mechanical Engineering, 2015Co-Authors: Hassan Ghassemi, Manouchehr Fadavie, Daniel NematyAbstract:This paper aims to predict the Hydrodynamic characteristics and structural analysis of the marine propeller under pressure Hydrodynamic Loading. Because of the Loading on the propeller blade, it goes under significant deformation that may affect the Hydrodynamic performance of the propeller. Thus, the blade deformation of a propeller due to fluid pressure should be analyzed, considering hydro-elastic analysis. The propeller was made of anisotropic composite materials, and the geometry of the propeller is for one skew angle. First, the Hydrodynamic pressure Loading is obtained by FVM and then the deformation of the blade due to this pressure was calculated. Next, the pressure load for deformed propeller is achieved; it is again repeated to obtain the new deformed propeller. This procedure is repeated to converge the thrust, torque and efficiency. We present all results of the pressure distribution, Hydrodynamic characteristics, stress and deformation of the propeller.
