The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Tucker George - One of the best experts on this subject based on the ideXlab platform.
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George Tucker photograph, Bertram Mills Circus, 1957.
National Fairground Archive University of Sheffield Library, 2000Co-Authors: Tucker GeorgeAbstract:Photograph of Bertram Mills' Trailer number 70 by Cranes (Dereham) Limited, taken Bertram Mills' Circus, 30 June 1957 whole side and back view. Trailer was built around 1932 and is on 27 inch by 6 inch tyres. Has channel Stanchions and angle bail on top
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George Tucker photograph, Bertram Mills Circus, 1954.
National Fairground Archive University of Sheffield Library, 2000Co-Authors: Tucker GeorgeAbstract:Photograph of Trailer number 76 - HYL45 ? - by Cranes (Dereham) Limited, taken at Bertram Mills' Circus, 3 October 1954 side and back view. Trailer is on 27 inch by 6 inch tyres. Numbers 75 and 76 were for stable equipment and tents. Has extra board on top of Stanchions
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George Tucker photograph, Bertram Mills Circus, 1957.
National Fairground Archive University of Sheffield Library, 2000Co-Authors: Tucker GeorgeAbstract:Photograph of Bertram Mills' Circus taken 30 June 1957 side and back view of trailer number 75 by Cranes (Dereham) Limited, built around 1932. Is on 27 inch by 6 inch tyres. Numbers 75 and 76 are for stable equipment and tents. Has extra board on top of side Stanchions
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George Tucker photograph, Bertram Mills Circus, 1954.
National Fairground Archive University of Sheffield Library, 2000Co-Authors: Tucker GeorgeAbstract:Photograph of Bertram Mills' Circus taken 3 October 1954 whole side and back view of trailer number 75, built by Cranes (Dereham) Limited about 1932. Trailer is on 27 inch by 6 inch tyres. Trailer numbers 75 and 76 were built for stable equipment and tents. Trailer has an extra board on top of Stanchions
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George Tucker photograph, Bertram Mills Circus, 1957.
National Fairground Archive University of Sheffield Library, 2000Co-Authors: Tucker GeorgeAbstract:Photograph of trailer number 76 by Cranes (Dereham) Limited, taken at Bertram Mills' Circus, 30 June 1957 whole front and side view. Trailer was built about 1932 and is on 27 inch by 6 inch tyres. Numbers 75 and 76 are for stable equipment and tents. Has extra board on top of side Stanchions
Timothy O'doherty - One of the best experts on this subject based on the ideXlab platform.
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Numerical investigation of shallow-water effects on hydrokinetic turbine wake recovery
International Marine Energy Journal, 2020Co-Authors: Oumnia El Fajri, Shanti Bhushan, David Thompson, Timothy O'dohertyAbstract:Thrust, power and intermediate wake predictions obtained using resolved rotating blade with sliding mesh simulations for a hydrokinetic turbine (HKT) are assessed using the open-source flow solver OpenFOAM. Single- and two-phase URANS and DES computations are performed for three-blade, 0.5m diameter (D) turbine mounted on a stanchion that intersects the free surface with a tip-speed ratio λ = 6.15. The thrust and power predictions compare within 5% of the experimental data. Results show that the thrust predictions are dominated by the pressure distribution on the blades, whereas the shear stress plays a significant role in the power predictions. The turbine performance showed unsteadiness with amplitudes around 3% of the mean, due to the disruption of the flow each time a blade passed in front of the stanchion. The wake recovery is primarily due to the growth of shear layers (originating from the blade tips) towards the turbine axis, which are primarily caused by the cross-plane turbulent velocity. The shear layer growth is enhanced by the turbulence produced by the stanchion. Predictions of the mean wake profile compared within 10% of the experimental data, which is significant improvement over previous Fluent predictions that showed large errors of 22%. The improved predictions in OpenFOAM is attributed to better turbulence predictions. Two-phase results show that the interaction between the wake and free-surface is initiated by the interaction of stanchion with the free-surface. The free-surface creates a blockage effect that accelerates the flow in the upper bypass region and enhances the wake recovery.
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The effect of tidal flow directionality on tidal turbine performance characteristics
Renewable Energy, 2015Co-Authors: Carwyn Frost, Ceri E. Morris, Allan Mason-jones, Daphne Maria O'doherty, Timothy O'dohertyAbstract:With many Tidal Energy Conversion (TEC) devices at full scale prototype stage there are two distinct design groups for Horizontal Axis Tidal Turbines (HATTs). Devices with a yaw mechanism allowing the turbine to always face into the flow, and devices with blades that can rotate through 180° to harness a strongly bi-directional flow. As marine turbine technology verges on the realm of economic viability this paper reveals the performance of Cardiff University's concept tidal turbine with its support structure either upstream or downstream and with various proximities between the rotating plane of the turbine and its support stanchion. Through the use of validated Computational Fluid Dynamics (CFD) modelling this work shows the optimal proximity between rotor plane and stanchion as well as establishing, in the given context, the use of a yaw mechanism to be superior to a bi-directional system from a performance perspective.
Shujie Wang - One of the best experts on this subject based on the ideXlab platform.
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experimental study of wake structure behind a horizontal axis tidal stream turbine
Applied Energy, 2017Co-Authors: Yaling Chen, Binliang Lin, Jie Lin, Shujie WangAbstract:A detailed experimental investigation of the wake propagation behind a horizontal axis turbine with three blades was conducted in a recirculating water flume. An Acoustic Doppler Velocimeter was employed to measure the time varying velocities at fifteen depths across the width of the open flume to obtain the three-dimensional velocity and turbulence fields within the length of 20 Rotor Diameters downstream. The experimental results indicated that velocity reduction in the wake was caused by both the kinetic energy extraction and blockage effects of the tidal stream turbine rotor and stanchion. The maximum velocity deficit occurred at the wake core due to a lower tip speed ratio and blockage of the hub. The wake strip gradually enlarged with the distance downstream, with less mixing in the transverse direction. The wake zone shifted towards the water surface in the vertical direction, which mainly resulted from the merging of two wakes induced by turbine rotor and stanchion. The wake rotation was also observed, and the maximum circumfluence velocity was approximately 20% of the stream-wise velocity; thus, it had a significant influence on the process of near wake mixing. Furthermore, the wake turbulence of the turbine was strong and anisotropic, which would have an impact on the behaviour of other turbines located downstream if they were in a turbine array. In addition, the turbine stanchion had a visible influence on the wake structure, especially near the wake, which should not be neglected when studying the wake characteristics.
Loren W. Tauer - One of the best experts on this subject based on the ideXlab platform.
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Empirical Analysis of Stanchion and Parlor Milking Cost on New York Dairy Farms
2008Co-Authors: Kentaro Katsumata, Loren W. TauerAbstract:This paper empirically estimates cost functions for two milking technologies, stanchion and parlor, using farm level data from New York dairy farms for the years 1993 through 2002. A translog cost function was estimated along with input cost share equations for each milking technology by Iterative Seemingly Unrelated Regression. Any pair of inputs among feed, hired Labor, and cows had some degree of substitutability except for a pair of feed and hired labor evaluated by the Allen elasticity, and that of hired labor and feed evaluated by the Morishima elasticity. Additionally, economies of scale were found to exist over the entire range of output levels of the samples. The cost of stanchion technology was lower than that of parlor technology over the sample range of output levels of stanchion technology, but because parlor using farms were larger and costs continually decline, parlor using farms eventually experience lower costs than farms milking with Stanchions.
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Cost of Production for Stanchion Versus Parlor Milking in New York
Journal of Dairy Science, 1998Co-Authors: Loren W. TauerAbstract:Curves describing the unit cost of production by herdsize were estimated separately for stanchion and parlor milking systems using empirical data for 1995 from 403 New York dairy farms. The least cost size for stanchion barns was 120 cows, for which the total cost of producing a hundredweight of milk was $13.86, or $1.00 less than the cost of producing milk using a parlor system with 120 cows. With more than 160 cows, milk was produced at a lower cost using a parlor rather than a stanchion system. Parlors have a minimum cost that is about $2.00 less than the minimum cost of the stanchion barns.
Yaling Chen - One of the best experts on this subject based on the ideXlab platform.
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experimental study of wake structure behind a horizontal axis tidal stream turbine
Applied Energy, 2017Co-Authors: Yaling Chen, Binliang Lin, Jie Lin, Shujie WangAbstract:A detailed experimental investigation of the wake propagation behind a horizontal axis turbine with three blades was conducted in a recirculating water flume. An Acoustic Doppler Velocimeter was employed to measure the time varying velocities at fifteen depths across the width of the open flume to obtain the three-dimensional velocity and turbulence fields within the length of 20 Rotor Diameters downstream. The experimental results indicated that velocity reduction in the wake was caused by both the kinetic energy extraction and blockage effects of the tidal stream turbine rotor and stanchion. The maximum velocity deficit occurred at the wake core due to a lower tip speed ratio and blockage of the hub. The wake strip gradually enlarged with the distance downstream, with less mixing in the transverse direction. The wake zone shifted towards the water surface in the vertical direction, which mainly resulted from the merging of two wakes induced by turbine rotor and stanchion. The wake rotation was also observed, and the maximum circumfluence velocity was approximately 20% of the stream-wise velocity; thus, it had a significant influence on the process of near wake mixing. Furthermore, the wake turbulence of the turbine was strong and anisotropic, which would have an impact on the behaviour of other turbines located downstream if they were in a turbine array. In addition, the turbine stanchion had a visible influence on the wake structure, especially near the wake, which should not be neglected when studying the wake characteristics.