Fluid dynamic performance of a vertical axis turbine for tidal currents

2011 ◽  
Vol 36 (12) ◽  
pp. 3355-3366 ◽  
Author(s):  
Bo Yang ◽  
Chris Lawn
Keyword(s):  
Fluid Dynamic ◽  
Dynamic Performance ◽  
Vertical Axis ◽  
Tidal Currents ◽  
Vertical Axis Turbine

Converting Kinetic Energy in Small Watercourses Using Direct Drive Generators

2004 ◽  
Author(s):  
Karin Nilsson ◽  
Erik Segergren ◽  
Jan Sundberg ◽  
Elisabeth Sjo¨stedt ◽  
Mats Leijon
Keyword(s):  
Kinetic Energy ◽  
Vertical Axis ◽  
Research Area ◽  
Theoretical Concept ◽  
Tidal Currents ◽  
Ocean Currents ◽  
Water Current ◽  
Direct Drive ◽  
Flow Profiles ◽  
Vertical Axis Turbine

Tidal currents, ocean currents and unregulated watercourses are all large sources of energy that can be converted into electricity. Several technical and economical solutions within this research area have been demonstrated. In literature there exists two different turbine types, horizontal and vertical axis. The present paper focuses on the design of a permanent magnetized generator directly coupled to a vertical axis turbine. The proposed theoretical concept is adapted to data measurements regarding water current velocities and flow profiles from a Swedish watercourse. A high electromagnetic efficiency of 90% is obtained.

scholarly journals Experimental Investigation and Comparison of the Thermal Performance of Additively and Conventionally Manufactured Heat Exchangers

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 574
Author(s):  
Ana Vafadar ◽  
Ferdinando Guzzomi ◽  
Kevin Hayward
Keyword(s):  
Surface Roughness ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
High Efficiency ◽  
Cooling System ◽  
Fluid Dynamic ◽  
Dynamic Performance ◽  
Experimental Studies ◽  
Manufacturing Method ◽  
Industrial Sectors

Air heat exchangers (HXs) are applicable in many industrial sectors because they offer a simple, reliable, and cost-effective cooling system. Additive manufacturing (AM) systems have significant potential in the construction of high-efficiency, lightweight HXs; however, HXs still mainly rely on conventional manufacturing (CM) systems such as milling, and brazing. This is due to the fact that little is known regarding the effects of AM on the performance of AM fabricated HXs. In this research, three air HXs comprising of a single fin fabricated from stainless steel 316 L using AM and CM methods—i.e., the HXs were fabricated by both direct metal printing and milling. To evaluate the fabricated HXs, microstructure images of the HXs were investigated, and the surface roughness of the samples was measured. Furthermore, an experimental test rig was designed and manufactured to conduct the experimental studies, and the thermal performance was investigated using four characteristics: heat transfer coefficient, Nusselt number, thermal fluid dynamic performance, and friction factor. The results showed that the manufacturing method has a considerable effect on the HX thermal performance. Furthermore, the surface roughness and distribution, and quantity of internal voids, which might be created during and after the printing process, affect the performance of HXs.

Performance investigation of an innovative vertical axis turbine consisting of deflectable blades

2016 ◽  
Vol 179 ◽  
pp. 875-887 ◽  
Author(s):  
Min-Hsiung Yang ◽  
Guan-Ming Huang ◽  
Rong-Hua Yeh
Keyword(s):  
Vertical Axis ◽  
Vertical Axis Turbine

A Straight-Bladed Vertical-Axis Turbine for Wave Energy Conversion

2020 ◽  
Vol 2020 (0) ◽  
pp. OS09-12
Author(s):  
Keisuke KITANO ◽  
Yasutaka HAYAMIZU ◽  
Takayuki SUZUKI ◽  
Shinichi MORITA ◽  
Shigeru OHTSUKA ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Vertical Axis ◽  
Wave Energy Conversion ◽  
Vertical Axis Turbine

Experimental Study on the Straight-Bladed Vertical-Axis Turbine for Wave Energy Conversion

2021 ◽  
Vol 2021.59 (0) ◽  
pp. 07a5
Author(s):  
Keisuke KITANO ◽  
Yasutaka HAYAMIZU ◽  
Takayuki SUZUKI ◽  
Shigeru OHTSUKA ◽  
Shinichi MORITA ◽  
...  
Keyword(s):  
Experimental Study ◽  
Energy Conversion ◽  
Wave Energy ◽  
Vertical Axis ◽  
Wave Energy Conversion ◽  
Vertical Axis Turbine

The Vertical-Axis Turbine

2019 ◽  
pp. 29-55
Author(s):  
Grady Koch ◽  
Elias Koch
Keyword(s):  
Vertical Axis ◽  
Vertical Axis Turbine

Virtual Evaluation for Machine Tool Design

2008 ◽  
Author(s):  
Masahiko Mori ◽  
Zachary I. Piner ◽  
Ke Ding ◽  
Adam Hansel
Keyword(s):  
Machine Tool ◽  
Fluid Dynamic ◽  
Dynamic Performance ◽  
Digital Simulation ◽  
Machining Accuracy ◽  
Analysis Model ◽  
Simulation Accuracy ◽  
Theoretical Simulation ◽  
Physical Experiments ◽  
Static Rigidity

This paper presents the virtual machine tool environment Mori Seiki established for the evaluation of static, dynamic, and thermal performance of Mori Seiki machine tools. In this system environment, machining accuracy and quality are the main focus for each individual analysis discipline. The structural analysis uses the Finite Element Method (FEM) to monitor and optimize the static rigidity of the machine tool. Correlation between physical experiments and digital simulation is conducted to validate and optimize the static simulation accuracy. To accurately evaluate and effectively optimize dynamic performance of the machine tool in the virtual environment, the critical modal parameters such as damping and stiffness are calibrated based on experimental procedures which results in precise setup of the frequency response models. Computational Fluid Dynamic (CFD) analysis model is built in the environment so that the thermal perspective of the machine tool is evaluated and thermal deformation is monitored. This paper demonstrates compatibility of the digital simulation with physical experiments and success in integrating theoretical simulation processes with practical Mori Seiki machine tool development.

Performance Modeling of Ducted Vertical Axis Turbine Using Computational Fluid Dynamics

2013 ◽  
Vol 47 (4) ◽  
pp. 36-44 ◽  
Author(s):  
Prasun Chatterjee ◽  
Raymond N. Laoulache
Keyword(s):  
Performance Modeling ◽  
Flow Direction ◽  
Computational Cost ◽  
Vertical Axis ◽  
Area Ratio ◽  
Diameter Ratio ◽  
Turbulent Model ◽  
Ansys Fluent ◽  
Second Order In Time ◽  
Vertical Axis Turbine

AbstractVertical axis turbines (VATs) excel over horizontal axis turbines in their independent flow direction. VATs that operate in an enclosure, e.g., a diffuser shroud, are reported to generate more power than unducted VATs. A diffuser-shrouded, high solidity of 36.67%, three-blade VAT with NACA 633-018 airfoil section is modeled in 2-D using the commercial software ANSYS-FLUENT®. Incompressible, unsteady, segregated, implicit, and second order in time and space solver is implemented in association with the Spalart-Allmaras turbulent model with a reasonable computational cost. The computational results are assessed against experimental data for unducted VAT at low tip speed ratios between 1 and 2 for further numerical analysis on diffuser models. Different diffuser designs are investigated using suitable nozzle size, area ratio, length-to-diameter ratio and angles between the diffuser inner surfaces. The numerical model shows that, for a specific diffuser design, the ducted VAT performance coefficient can be augmented by almost 90% over its unducted counterpart.

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