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Journal articles on the topic 'Vertical axis water current turbine'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

FERNÁNDEZ JIMÉNEZ, AITOR, EDUARDO BLANCO MARIGORTA, AHMED GHARIB, VICTOR MANUEL FERNANDEZ PACHECO, and EDUARDO ALVAREZ ALVAREZ. "EVALUATION OF A VERTICAL AXIS HYDROKINETIC TURBINE FOR WATER CHANNELS." DYNA 96, no. 1 (2021): 194–99. http://dx.doi.org/10.6036/9883.

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The growing interest on low-carbon energy systems has been essential to develop new electricity devices based on renewable resources. In this context, channel turbines are an excellent alternative to supply demands that are isolated from power mains. These devices, which harness the kinetic term of the water current, can be installed in hydraulic channels, rivers, or estuaries. This article carries out an experimental characterization of a hydrokinetic turbine in a hydrodynamic water tunnel under low velocity conditions, so its behavior under open field conditions can be obtained. The results show the relevance of the blockage effect made by the turbine during the power stage. Keywords: hydrokinetic turbines, blockage, water channels, low velocity

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2

Ma, Yong, Chao Hu, Yulong Li, Lei Li, Rui Deng, and Dapeng Jiang. "Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine." Water 10, no. 11 (2018): 1694. http://dx.doi.org/10.3390/w10111694.

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The goal of this manuscript is to investigate the influence of relative distance between the twin rotors on the hydrodynamic performance of the vertical axis twin-rotor tidal current turbine. Computational fluid dynamics (CFD) simulations based on commercial software ANSYS-CFX have been performed to enhance the understanding of interactions between the twin-rotors. The interactions between the twin rotors are known to have increased the power output efficiency as a whole, and it is, therefore, of great significance to undertake deeper research. The simulation results are found to be consistent with similar research results in the literature in some aspects. The simulation results of stand-alone turbine and twin rotors are compared from three different aspects, including blade forces, power output efficiency and wake flow field. The results showed that the cyclic variations tendency of blade force coefficients of twin rotors is close to that of the stand-alone turbine. The average power output efficiency of the twin-rotors system is higher than that of the stand-alone turbine. The interactions between the turbines increase the power output of the twin turbine system as whole in a wide relative distance range. However, smaller relative distance between the twin rotors does not mean a bigger power output efficiency of such a system. The power out efficiency of such a system would decrease when the relative distance between the twin rotors exceeds the critical point. The power output of the twin rotors reaches the peak value when the ratio between the two main axis distance and diameter of the turbine is around 9/4. This research can provide a reference for the design and development of larger tidal power stations.

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3

Ponta, Fernando, and Gautam Shankar Dutt. "An improved vertical-axis water-current turbine incorporating a channelling device." Renewable Energy 20, no. 2 (2000): 223–41. http://dx.doi.org/10.1016/s0960-1481(99)00065-8.

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4

Behrouzi, Fatemeh, Adi Maimun Abdul Malik, Mehdi Nakisa, and Yasser Mohamed Ahmed. "Arm Effect on Performance of Vertical Axis Current Turbine Using RANS Simulation." Applied Mechanics and Materials 554 (June 2014): 531–35. http://dx.doi.org/10.4028/www.scientific.net/amm.554.531.

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Climate changing, electrical demands, rising diesel fuel prices, as well as fossil fuel-based energy is limited and in fact is depleting ,are subjects to use of renewable technologies. Among the different renewable energy technologies, hydro power generation (large and small scale) is the prime choice in terms of contribution to the world's electricity generation by using water current turbines.CFD simulation using two equations turbulence model was carried out to compare performance of conventional savonius turnine and new consept of vertical axis turbine. This study was coducted to reach suitable desigh of vertical axis turbines for capturing more kineticenergy of current via of others esspecially,low current speed.

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5

Rahmani, Hamid, Mojtaba Biglari, Mohammad Sadegh Valipour, and Kamran Lari. "Numerical investigation of the effects of immersion on the efficiency of a tidal helical turbine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 12 (2018): 4299–310. http://dx.doi.org/10.1177/0954406218810301.

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In the current study, a two-phase simulation of a tidal helical turbine was performed that contrasts with previous studies in two ways. First, the current research simulated the turbine in different states of immersion in water, whereas previous studies simulated turbines mostly in single-phase conditions and full immersion in water. Second, the present study used a horizontal-axis turbine, whereas previous research employed a vertical-axis helical turbine or Darrius turbine. In this study, a simulation was conducted using the volume of fluid method in ANSYS Fluent 18. Results indicated that the complete immersion of the turbine in water generated a high torque, thereby reducing the efficiency of the device. To determine the conditions with the highest efficiency, immersion rates of 100%, 75%, 50%, and 25% in water were examined, and a configuration with best power coefficient ( C p = 0.175 in TSR = 0.47) was found in 25% immersion. In immersion rate of 25%, resistant pressure on blades was minimum.

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6

Castelli, Marco Raciti, and Ernesto Benini. "Numerical Simulation of a Straight-Bladed Vertical-Axis Water Turbine Operating in a 2 m/s Current." Applied Mechanics and Materials 325-326 (June 2013): 162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.162.

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The present work proposes a full campaign of simulation of a Darrieus-type Vertical-Axis Water Turbine (VAWaterT) operating in an open flow-field. After describing the computational model and the relative validation procedure, a complete campaign of simulations based on full RANS unsteady calculations is presented for a three-bladed rotor architecture, characterized by a NACA 0025 blade profile. Flow field characteristics are investigated for several values of tip speed ratio and for a constant unperturbed free-stream water velocity of 2 m/s. Finally, the torque coefficient generated from the three blades is determined for each simulated angular velocity, allowing the calculation of the rotor power-curve. Keywords: Vertical-Axis Water Turbine, hydrokinetic technology, CFD, NACA 0025.

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7

Han, Ronggui, Yong Ma, and Lei Li. "Array Arrangement on Vertical Axis Tidal Current Turbine Using Free Vortex Model." Journal of Coastal Research 103, sp1 (2020): 361. http://dx.doi.org/10.2112/si103-074.1.

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8

Zhou, Donghai, and Xiaojing Sun. "Influences of Geometrical Parameters of Upstream Deflector on Performance of a H-Type Vertical Axis Marine Current Turbine." Energies 14, no. 14 (2021): 4087. http://dx.doi.org/10.3390/en14144087.

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Marine current power is a kind of renewable energy that has attracted increasing attention because of its abundant reserves, high predictability, and consistency. A marine current turbine is a large rotating device that converts the kinetic energy of the marine current into mechanical energy. As a straight-bladed vertical axis marine current turbine (VAMCT) has a square or rectangular cross-section, it can thus have a larger swept area than that of horizontal axis marine current turbines (HAMCT) for a given diameter, and also have good adaptability in shallow water where the turbine size is limited by both width and depth of a channel. However, the low energy utilization efficiency of the VAMCT is the main bottleneck that restricts its application. In this paper, two-dimensional numerical simulations were performed to investigate the effectiveness of an upstream deflector on improving performance of the straight-bladed (H-type) marine current turbine. The effects of various key geometrical parameters of the deflector including position, length, and installation angle on the hydrodynamic characteristics of the VAMCT were then systematically analyzed in order to explore the mechanism underlying the interaction between the deflector and rotor of a VAMCT. As a result, the optimal combination of geometrical parameters of the deflector by which the maximum energy utilization efficiency was achieved was a 13.37% increment compared to that of the original VAMCT. The results of this work show the feasibility of the deflector as a potential choice for improving the energy harvesting performance of a VAMCT with simple structure and easy implementation.

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9

Agbakwuru, Jasper Ahamefula, and Umar Ukkasha Ibrahim. "A novel initiative on vertical-axis underwater turbine suitable for low underwater current velocities." Underwater Technology 36, no. 3 (2019): 43–51. http://dx.doi.org/10.3723/ut.36.043.

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The present paper discusses efforts made to reinvent the use of the vertical-axis turbine for use in locations of low underwater current velocities. The present work targets the low flow current of the sub-Saharan ocean system, which has an underwater current record of around 0.3 m/s and a sea state that is mild, benign and with little or no local storms. The present initiative is achieved through a combination of ducting techniques to increase velocity of flow, and the utilisation of a large surface contact area exposed to flowing water per unit of time. Torque estimations are made using three methods: first principle, SolidWorks computational fluid dynamics (CFD) software and physical measurement. The lowest power coefficient for the tested model is computed from SolidWorks CFD software as 0.70. Existing state-of-the-art underwater current power technologies are reviewed and the present initiative described. A future for ocean water current technology in sub-Saharan Africa is also proposed.

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10

Xu, Gang, Haoyi Li, and Shuqi Wang. "Numerical Study on the Vertical-Axis Tidal Current Turbine with Coupled Motions (Part I)." Journal of Coastal Research 97, sp1 (2019): 273. http://dx.doi.org/10.2112/si97-040.1.

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11

Mejia, Omar, Jhon Quiñones, and Santiago Laín. "RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine." Energies 11, no. 9 (2018): 2348. http://dx.doi.org/10.3390/en11092348.

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Nowadays, the global energy crisis has encouraged the use of alternative sources like the energy available in the water currents of seas and rivers. The vertical axis water turbine (VAWT) is an interesting option to harness this energy due to its advantages of facile installation, maintenance and operation. However, it is known that its efficiency is lower than that of other types of turbines due to the unsteady effects present in its flow physics. This work aims to analyse through Computational Fluid Dynamics (CFD) the turbulent flow dynamics around a small scale VAWT confined in a hydrodynamic tunnel. The simulations were developed using the Unsteady Reynolds Averaged Navier Stokes (URANS), Detached Eddy Simulation (DES) and Delayed Detached Eddy Simulation (DDES) turbulence models, all of them based on k-ω Shear Stress Transport (SST). The results and analysis of the simulations are presented, illustrating the influence of the tip speed ratio. The numerical results of the URANS model show a similar behaviour with respect to the experimental power curve of the turbine using a lower number of elements than those used in the DES and DDES models. Finally, with the help of both the Q-criterion and field contours it is observed that the refinements made in the mesh adaptation process for the DES and DDES models improve the identification of the scales of the vorticity structures and the flow phenomena present on the near and far wake of the turbine.

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12

Pranio, Jeri, and Karnowo Karnowo. "THE EFFECT OF BLADE NUMBER AND WATER VELOCITY TOWARD THE PERFORMANCE OF HELIKS GORLOV TURBINE." Jurnal Penelitian Saintek 24, no. 2 (2019): 108–20. http://dx.doi.org/10.21831/jps.v24i2.20287.

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This study was aimed at determining the influence of the number of blades and water velocity on the performance of vertical axis water turbine type Helical Gorlov. The method used was an experimental method. The descriptive analysis method was also used to analyze the data. The data obtained were in the form of variations of blades number and water velocity. The variations in the number of blades used were 2 blades, 3 blades, and 4 blades. While water velocity variations used were 0.81 m / s, 0.94 m / s, 1.08 m / s, and 1.18 m / s. The parameters were used to measure the amount of current and voltage produced by the multimeter and the number of rotations per minute (rpm) of the turbine produced by the tachometer. The results show that the number of blades and water velocity affected the performance of the Gorlov helical water turbine. The most optimal Gorlov helical turbine based on the results of research with the highest power coefficient (Cp) value is a turbine with 2 blades at a water velocity of 0.94 m/s which produces a Cp value of 0.00376 and a TSR value of 1.35.PENGARUH JUMLAH SUDU DAN KECEPATAN AIR TERHADAP KINERJA TURBIN AIR SUMBU VERTIKAL TIPE HELIKS GORLOVPenelitian ini bertujuan untuk pengaruh jumlah sudu dan kecepatan air terhadap kinerja turbin air sumbu vertikal tipe Heliks Gorlov. Metode yang digunakan dalam penelitian ini adalah eksperimen. Penelitian ini menggunakan analisis deskriptif.Data yang duperoleh berupa variasi jumlah sudu dan variasi kecepatan air. Variasi jumlah sudu yang digunakan adalah 2 sudu, 3 sudu, dan 4 sudu. Variasi kecepatan air yang digunakan yaitu 0,81 m/s, 0,94 m/s, 1,08 m/s, dan 1,18 m/s. Parameter dalam penelitian ini yang digunakan untuk menentukan kinerja adalah mengukur besarnya arus dan tegangan yang dihasilkan multimeter dan banyaknya rotasi per menit (rpm) dari turbin yang dihasilkan tachometer.Hasil penelitian menunjukkan bahwa jumlah sudu dan kecepatan air mempengaruhi kinerja turbin air heliks gorlov. Kedua, kecepatan air mempengaruhi kinerja turbin air heliks gorlov.Turbin heliks Gorlov paling optimal berdasarkan hasil penelitian dengan nilai koefisien daya (Cp) tertinggi yaitu turbin dengan 2 sudu pada kecepatan air 0,94 m/s yang menghasilkan nilai Cp sebesar 0,00376 dan nilai TSR 1,35.

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13

Hu, Chao, Yong Ma, Lei Li, and Tengfei Li. "Coupled Motion Prediction of a Floating Tidal Current Power Station with Vertical Axis Twin-rotor Turbine." Journal of Coastal Research 103, sp1 (2020): 784. http://dx.doi.org/10.2112/si103-162.1.

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14

Hua-Ming, Wang, Qu Xiao-Kun, Chen Lin, Tu Lu-Qiong, and Wu Qiao-Rui. "Numerical study on energy-converging efficiency of the ducts of vertical axis tidal current turbine in restricted water." Ocean Engineering 210 (August 2020): 107320. http://dx.doi.org/10.1016/j.oceaneng.2020.107320.

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15

Huang, Tong. "Design of Scenery Complementary Solar Water Heater Based on Eddy Current Method." Applied Mechanics and Materials 686 (October 2014): 620–26. http://dx.doi.org/10.4028/www.scientific.net/amm.686.620.

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This paper uses scenery complementary heating method to discuss a new type of scenery complementary water heater design. This product can be divided into two parts. The first part is the eddy current method wind power heating part, which is driven by wind power and vertical axis wind turbines and the design of magnet array rotor disc rotation, namely, magnetic field rotating, induced eddy current in the stator, so as to generate heat. The second part is the solar heating part. This works has broad market prospect, which provides a new idea for large-scaled heating method.

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16

Ji, Renwei, Ke Sun, Shuqi Wang, Yan Li, and Liang Zhang. "Analysis of Hydrodynamic Characteristics of Ocean Ship Two-unit Vertical Axis Tidal Current Turbines with Different Arrangements." Journal of Coastal Research 83, sp1 (2019): 98. http://dx.doi.org/10.2112/si83-017.1.

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17

Sheikh, Shakil Rehman, Syed Hassan Raza Shah, Umar Rauf, et al. "A Low-Cost Sustainable Energy Solution for Pristine Mountain Areas of Developing Countries." Energies 14, no. 11 (2021): 3160. http://dx.doi.org/10.3390/en14113160.

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The rise in energy requirements and its shortfall in developing countries have affected socioeconomic life. Communities in remote mountainous regions in Asia are among the most affected by energy deprivation. This study presents the feasibility of an alternate strategy of supplying clean energy to the areas consisting of pristine mountains and forest terrain. Southeast Asia has a much-diversified landscape and varied natural resources, including abundant water resources. The current study is motivated by this abundant supply of streams which provides an excellent environment for run-of-river micro vertical axis water turbines. However, to limit the scope of the study, the rivers and streams flowing in northern areas of Pakistan are taken as the reference. The study proposes a comprehensive answer for supplying low-cost sustainable energy solutions for such remote communities. The suggested solution consists of a preliminary hydrodynamic design using Qblade, further analysis using numerical simulations, and finally, experimental testing in a real-world environment. The results of this study show that the use of microturbines is a very feasible option considering that the power generation density of the microturbine comes out to be approximately 2100 kWh/year/m2, with minimal adverse effects on the environment.

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Zheng, Xiangyuan, Huadong Zheng, Yu Lei, Yi Li, and Wei Li. "An Offshore Floating Wind–Solar–Aquaculture System: Concept Design and Extreme Response in Survival Conditions." Energies 13, no. 3 (2020): 604. http://dx.doi.org/10.3390/en13030604.

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This study presents a new concept design combining multiple megawatt (MW) vertical-axis wind turbines (VAWTs) and a solar array with a floating steel fish-farming cage. This combined wind–solar–aquaculture (WSA) system is intended to utilize the ocean space and water resources more effectively and more economically, while greatly shortening the payback period of investment in offshore power generation. The details of this WSA design are described, showing that a square-shaped fishing cage serves as a floating foundation for the 7600 m2 solar array and four multi MW VAWTs. The WAMIT program based on potential-flow theory is employed to obtain the WSA’s motion response amplitude operators (RAOs) in sinusoidal waves of varying periods. The motion RAOs indicated that the proposed concept possesses better hydrodynamic seakeeping performances than its OC3Hywind spar and OC4DeepCwind semi-submersible counterparts. A potential site located in the northwest South China Sea is selected to deploy the WSA. Its feasibility is then examined in terms of the hydrodynamic motions and structural dynamic response driven by wind, waves, and current. Fully coupled time-domain simulations are carried out for 50-year survival conditions. The whole structure exhibits outstanding performance for its small motions in random wind and seas. Moreover, under these survival conditions, the top accelerations and tower base stresses of the VAWTs and mooring line tensions readily meet the design requirements. Technically, the WSA has strong competitiveness and wide prospects in the offshore industry for both power exploitation and marine aquaculture in intermediate and deep waters.

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Fankai, Kong, Wang Liying, and Zhang Di. "Optimization on the Law of Variable-Pitch Vertical-Axis Tidal Current Turbine." MATEC Web of Conferences 153 (2018): 03002. http://dx.doi.org/10.1051/matecconf/201815303002.

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In order to improve the hydrodynamic performance of the vertical-axis variable-pitch current turbine, with analyzing on the existing design mentality of blade control mechanism, an optimized law of variable-pitch vertical-axis tidal current turbine was given in terms of the instantaneous moment coefficient of the blade. A method for solving the lift - drag coefficient of Blade by wind - hole test data is given. The optimized kinematic model has a significant reference value for the further development of vertical axis turbine model test.

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Khudri Johari, Muhd, Muhammad Azim A Jalil, and Mohammad Faizal Mohd Shariff. "Comparison of horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT)." International Journal of Engineering & Technology 7, no. 4.13 (2018): 74. http://dx.doi.org/10.14419/ijet.v7i4.13.21333.

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As the demand for green technology is rising rapidly worldwide, it is important that Malaysian researchers take advantage of Malaysia’s windy climates and areas to initiate more power generation projects using wind. The main objectives of this study are to build a functional wind turbine and to compare the performance of two types of design for wind turbine under different speeds and behaviours of the wind. A three-blade horizontal axis wind turbine (HAWT) and a Darrieus-type vertical axis wind turbine (VAWT) have been designed with CATIA software and constructed using a 3D-printing method. Both wind turbines have undergone series of tests before the voltage and current output from the wind turbines are collected. The result of the test is used to compare the performance of both wind turbines that will imply which design has the best efficiency and performance for Malaysia’s tropical climate. While HAWT can generate higher voltage (up to 8.99 V at one point), it decreases back to 0 V when the wind angle changes. VAWT, however, can generate lower voltage (1.4 V) but changes in the wind angle does not affect its voltage output at all. The analysis has proven that VAWT is significantly more efficient to be built and utilized for Malaysia’s tropical and windy climates. This is also an initiative project to gauge the possibility of building wind turbines, which could be built on the extensive and windy areas surrounding Malaysian airports.

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21

Yain, N. Muhamat, A. M. Abdul Malik, A. Ali, A. S. Souf-Aljen, F. Behrouzi, and M. Nakisa. "Low Speed Vertical Axis Current Turbine (LS-VACT): Experimental Results." IOP Conference Series: Materials Science and Engineering 884 (July 21, 2020): 012089. http://dx.doi.org/10.1088/1757-899x/884/1/012089.

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22

Fernandes, Antonio Carlos, and Ali Bakhshandeh Rostami. "Hydrokinetic energy harvesting by an innovative vertical axis current turbine." Renewable Energy 81 (September 2015): 694–706. http://dx.doi.org/10.1016/j.renene.2015.03.084.

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23

Satrio, Dendy, I. Ketut Aria Pria Utama, and Mukhtasor. "Numerical Investigation of Contra Rotating Vertical-Axis Tidal-Current Turbine." Journal of Marine Science and Application 17, no. 2 (2018): 208–15. http://dx.doi.org/10.1007/s11804-018-0017-5.

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Kim, Do-Hyung, and Byoung-Kwon Ahn. "Study on Vertical Axis Water Turbine with Movable Dual Blades." Journal of Ocean Engineering and Technology 30, no. 2 (2016): 125–33. http://dx.doi.org/10.5574/ksoe.2016.30.2.125.

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Cao, Yang, Xiao Ning Li, Guo Qing Wu, Xing Hua Chen, and Xiao Yan Tian. "Design and Optimization of Vertical Axis Wind Turbine." Applied Mechanics and Materials 150 (January 2012): 148–53. http://dx.doi.org/10.4028/www.scientific.net/amm.150.148.

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Wind power is a clean and renewable energy, and more and more countries in the world attach great importance to it and promote the development of the wind power industry. The current situation of wind turbines at home and abroad, the development, types, and characteristics were analyzed. The structural design of vertical axis wind turbine (VAWT) and aerodynamic theory of rotor blade were briefly introduced, the characteristic parameters in VAWT design were presented in this paper. Using finite element analysis method, the spindle which is the crucial component of VAWT under the extreme wind load was analyzed, and the corresponding results were obtained. Finally the wall thickness and the structure of spindle were improved and optimized to satisfy the engineering requirements of spindle.

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Chen, J., H. X. Yang, C. P. Liu, C. H. Lau, and M. Lo. "A novel vertical axis water turbine for power generation from water pipelines." Energy 54 (June 2013): 184–93. http://dx.doi.org/10.1016/j.energy.2013.01.064.

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Abkar, Mahdi. "Theoretical Modeling of Vertical-Axis Wind Turbine Wakes." Energies 12, no. 1 (2018): 10. http://dx.doi.org/10.3390/en12010010.

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In this work, two different theoretical models for predicting the wind velocity downwind of an H-rotor vertical-axis wind turbine are presented. The first model uses mass conservation together with the momentum theory and assumes a top-hat distribution for the wind velocity deficit. The second model considers a two-dimensional Gaussian shape for the velocity defect and satisfies mass continuity and the momentum balance. Both approaches are consistent with the existing and widely-used theoretical wake models for horizontal-axis wind turbines and, thus, can be implemented in the current numerical codes utilized for optimization and real-time applications. To assess and compare the two proposed models, we use large eddy simulation as well as field measurement data of vertical-axis wind turbine wakes. The results show that, although both models are generally capable of predicting the velocity defect, the prediction from the Gaussian-based wake model is more accurate compared to the top-hat counterpart. This is mainly related to the consistency of the assumptions used in the Gaussian-based wake model with the physics of the turbulent wake development downwind of the turbine.

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Xie, Yu, Haigui Kang, Bing Chen, and Wei Guo. "Research on the end-plate for vertical axis tidal current turbine." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 231, no. 3 (2016): 750–59. http://dx.doi.org/10.1177/1475090216681259.

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Zhao, Wen De, Yi Li, and Yan Tao Li. "Mechanism Design and Modal Analysis of Vertical-Axis Tidal Turbine." Key Engineering Materials 572 (September 2013): 433–36. http://dx.doi.org/10.4028/www.scientific.net/kem.572.433.

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A vertical-axis tidal turbine was designed in the paper. Modal analysis of the vertical-axis tidal turbine was investigated based finite element software analysis method. Finite element simulation model for modal analysis of the accelerator and the whole tidal turbine were built by appropriate structure simplification. And, the anterior 10 ranks of natural frequencies and corresponding mode shapes were calculated. Modal analysis results show that the natural frequency of the turbine away from the frequencies of tidal current incentive, impeller incentive and generator rotor incentive, so the resonance phenomenon does not exist in the turbine of the paper. Also, the modal analysis results show that the input of the accelerator and leaves of impeller have a large deformation, and the stiffness of the input shaft and spokes and leaves of impeller should be increased.

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Ma, Yong, Chao Hu, Yulong Li, and Rui Deng. "Research on the Hydrodynamic Performance of a Vertical Axis Current Turbine with Forced Oscillation." Energies 11, no. 12 (2018): 3349. http://dx.doi.org/10.3390/en11123349.

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For a current turbine fixed on a floating platform, the wave-induced motion responses of the platform change the hydrodynamic performance of the current turbine. In this paper, a numerical simulation method based on commercial computational fluid dynamics software-CFX is established to systematically analyze the turbine loads condition and power output efficiency of the turbine subject to the wave-induced motion. This method works well in terms of 2D hydrodynamic performance analysis and is verified by an experiment. In addition, the method is applied to investigate the hydrodynamic performance of a vertical axis current turbine under forced oscillation by a combining sliding mesh with moving mesh technique. This research mainly focusses on the effects of oscillation frequency and oscillation amplitude on the hydrodynamic performance and the flow field. It is found that a wake flow similar to the Von Karman Vortex Street appears under sway oscillation. Spacing between vortex in the wake flow changes under surge oscillation. The fluctuations of the blade load coefficients can be decomposed into a low frequency part and a high frequency part. The low frequency part is related to the frequency of the forced oscillation, while the high frequency part is a consequence of the rotational frequency of the turbine. The oscillation amplitudes of the turbine load coefficients increase linearly with the growth of oscillation frequency and oscillation amplitude. This paper can provide a useful reference for similar research on the turbine loads condition and power out efficiency of the turbine subject to wave-induced motion. This paper can also provide a reference on the structural design or electronic control of vertical axis current turbines.

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Li, Ye, and Sander M. Calisal. "Modeling of twin-turbine systems with vertical axis tidal current turbine: Part II—torque fluctuation." Ocean Engineering 38, no. 4 (2011): 550–58. http://dx.doi.org/10.1016/j.oceaneng.2010.11.025.

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32

Li, Guangnian, Qingren Chen, and Hanbin Gu. "Study of Hydrodynamic Interference of Vertical-Axis Tidal Turbine Array." Water 10, no. 9 (2018): 1228. http://dx.doi.org/10.3390/w10091228.

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The hydrodynamic interference between tidal turbines must be considered when predicting their overall hydrodynamic performance and optimizing the layout of the turbine array. These factors are of great significance to the development and application of tidal energy. In this paper, the phenomenon of hydrodynamic interference of the tidal turbine array is studied by the hydrodynamic performance forecast program based on an unsteady boundary element model for the vertical-axis turbine array. By changing the relative positions of two turbines in the double turbine array to simulate the arrangement of different turbines, the hydrodynamic interference law between the turbines in the array and the influence of relative positions on the hydrodynamic characteristics in the turbine array are explored. The manner in which the turbines impact each other, the degree of influence, and rules for turbine array arrangement for maximum efficiency of the array will be discussed. The results of this study will provide technical insights to relevant researchers.

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Hantoro, Ridho, I. K.A.P Utama,, Erwandi Erwandi, and Aries Sulisetyono. "An Experimental Investigation of Passive Variable-Pitch Vertical-Axis Ocean Current Turbine." ITB Journal of Engineering Science 43, no. 1 (2011): 27–40. http://dx.doi.org/10.5614/itbj.eng.sci.2011.43.1.3.

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Baidowi, Achmad, Semin Semin, Eddy Setyo Koenhardono, Amiadji Amiadji, and Favi Ainin. "Motion Response of a Novel Platform of Vertical Axis Marine Current Turbine." International Review of Mechanical Engineering (IREME) 13, no. 12 (2019): 710. http://dx.doi.org/10.15866/ireme.v13i12.18035.

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35

Jing, Fengmei, Qihu Sheng, and Liang Zhang. "Experimental research on tidal current vertical axis turbine with variable-pitch blades." Ocean Engineering 88 (September 2014): 228–41. http://dx.doi.org/10.1016/j.oceaneng.2014.06.023.

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Xie, Jiaming, and Jianyun Chen. "Vertical-axis ocean current turbine design research based on separate design concept." Ocean Engineering 188 (September 2019): 106258. http://dx.doi.org/10.1016/j.oceaneng.2019.106258.

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Yeo, Honggu, Woochan Seok, Soyong Shin, et al. "Computational Analysis of the Performance of a Vertical Axis Turbine in a Water Pipe." Energies 12, no. 20 (2019): 3998. http://dx.doi.org/10.3390/en12203998.

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In this study, a computational analysis was performed for a vertical-axis turbine which was installed in a water pipe to collect unused energy from the flow inside the pipe. The optimized operating conditions of the turbine were identified by comparing the energy-collecting performance obtained at different tip-speed ratios (TSRs). The turbine achieved the maximum efficiency of 22% at a TSR of 2.4 and collected 33 kW. Additional analyses were conducted to verify the effects of tip clearance, which is the distance between the turbine blades and the pipe wall, which showed that a higher efficiency was obtained with a smaller tip clearance. We also verified the effects of the turbine’s operating conditions and tip clearance on the flow field around the blades and wake of the turbine.

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Sun, Ke, Shah Khalid Syed, Liang Zhang, and Sahib Ghazala. "Effect of Diagonal Layout on Efficiency of Twin Vertical Axis Turbine." Advanced Materials Research 773 (September 2013): 203–6. http://dx.doi.org/10.4028/www.scientific.net/amr.773.203.

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Vertical axis turbine is one of the tools used to extract tidal current energy. The purpose of this study is to show the effect of diagonal layout on the efficiency of vertical axis tidal turbine (VATT), using commercial software ANSYS CFX. For this purpose the angle between the incoming current flows is varied while the distance between the turbines is kept constant. The layout is observed at an angle of 200, 300, 450, 600and 900. From study we observed that when the twin turbines are at angle of 900to the incoming flow, the turbines have maximum efficiency.

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Wenlong, Tian, Song Baowei, Mao Zhaoyong, and Ding Hao. "Design of a Novel Vertical Axis Water Turbine With Retractable Arc-Type Blades." Marine Technology Society Journal 47, no. 4 (2013): 94–100. http://dx.doi.org/10.4031/mtsj.47.4.18.

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AbstractA drag-type vertical axis water turbine, like Savonius, experiences negative torque in the returning half cycle, which limits the power efficiency. A new drag-type turbine, which consists of several retractable blades that are mounted on a drum, is designed and analyzed in this paper. The open angle of each blade is controlled to achieve a high output performance. Kinematics analysis demonstrated that the returning blades can fit to the drum and negative torques can then be considerably deduced. Two-dimensional computational fluid dynamics simulations were performed to give detailed information about the output of the turbine. The simulation results show that the maximum averaged power coefficient is 0.2595, obtained at a flow coefficient of 0.4.

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Brahimi, M. T., A. Allet, and I. Paraschivoiu. "Aerodynamic Analysis Models for Vertical-Axis Wind Turbines." International Journal of Rotating Machinery 2, no. 1 (1995): 15–21. http://dx.doi.org/10.1155/s1023621x95000169.

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This work details the progress made in the development of aerodynamic models for studying Vertical-Axis Wind Turbines (VAWT's) with particular emphasis on the prediction of aerodynamic loads and rotor performance as well as dynamic stall simulations. The paper describes current effort and some important findings using streamtube models, 3-D viscous model, stochastic wind model and numerical simulation of the flow around the turbine blades. Comparison of the analytical results with available experimental data have shown good agreement.

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Mohan Kumar, Palanisamy, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "Review on the Evolution of Darrieus Vertical Axis Wind Turbine: Large Wind Turbines." Clean Technologies 1, no. 1 (2019): 205–23. http://dx.doi.org/10.3390/cleantechnol1010014.

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The objective of the current review is to present the development of a large vertical axis wind turbine (VAWT) since its naissance to its current applications. The turbines are critically reviewed in terms of performance, blade configuration, tower design, and mode of failure. The early VAWTs mostly failed due to metal fatigue since the composites were not developed. Revisiting those configurations could yield insight into the future development of VAWT. The challenges faced by horizontal axis wind turbine (HAWT), especially in the megawatt capacity, renewed interest in large scale VAWT. VAWT provides a solution for some of the immediate challenges faced by HAWT in the offshore environment in terms of reliability, maintenance, and cost. The current rate of research and development on VAWT could lead to potential and economical alternatives for HAWT. The current summary on VAWT is envisioned to be an information hub about the growth of the Darrieus turbine from the kW capacity to megawatt scale.

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Ke, Sun, Zhou Xuehan, Li Yan, and Zhang Liang. "Numerical simulation on hydrodynamic performance of parallel twin vertical axis tidal current turbines." Maritime Technology and Research 1, no. 2 (2019): Manuscript. http://dx.doi.org/10.33175/mtr.2019.176062.

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The single and parallel twin vertical axis hydro turbines were numerical simulated by open source software-OpenFOAM, emphatically studied on the interference effect such as torque and load of turbine as well as hydrodynamic performance influenced by the distance and rotation forms between twin turbines and analysed the wake flow field to show the velocity profile distribution. Results show that the average power of parallel twin turbines is always higher than the power of a single turbine, the closer the lateral distance between turbines, the higher the power. At the same time, opposite inward rotation is the best arrangement form for twin turbines to get more power and counteract lateral force.

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Elbatran, Aly Hassan, Omar Yaakob, Yasser Ahmed, and Firdaus Abdallah. "Augmented Diffuser for Horizontal Axis Marine Current Turbine." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 1 (2016): 235. http://dx.doi.org/10.11591/ijpeds.v7.i1.pp235-245.

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<span>The potential of renewable energy sources is enormous as they can make a major contribution to the future of energy needs. The ocean has a great potential to become a practical and predictable energy source compared to other energy resources such as solar, wind, and nuclear. It offers different sources of energy which can be utilized namely wave, tidal, offshore wind, thermal, and tidal current. Among these sources, marine tidal current has major advantages such as higher power availability and predictability. The main objective of this research work is to design and develop a horizontal axis marine current turbine (HAMCT) that suitable for operating within Malaysian ocean, which has low speed current (0.5 – 1 m/s average). A prototype of augmented diffuser 4-bladed HAMCT applying NACA 0014 was proposed in the current study. The turbine model has 0.666 m diameter, and it was designed to produce as much as power from flowing water current. Model was constructed and tested at Marine Technology Center (MTC) in three conditions, namely, free tow testing, ducted tow testing, and ducted diffuser tow testing in order to predict the power and efficiency of the turbine system. The results showed that the application of duct was significant to concentrate the flow and diffuser arrangement was effective when it was placed behind of the rotor in this condition of low water current speed. The maximum efficiency Cp obtained in the current system was 0.58.</span>

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Du, Longhuan, Grant Ingram, and Robert G. Dominy. "A review of H-Darrieus wind turbine aerodynamic research." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 23-24 (2019): 7590–616. http://dx.doi.org/10.1177/0954406219885962.

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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 these usually small machines are to ensure that they self-start and to maintain and improve their efficiency. However, due to the turbine's rotation about a vertical axis, the aerodynamics of the turbine are more complex than a comparable horizontal axis wind turbine and our knowledge and understanding of these turbines falls remains far from complete. This paper provides a detailed review of past and current studies of the H-Darrieus turbine from the perspective of design parameters including turbine solidity, blade profile, pitch angle, etc. and particular focus is put on the crucial challenge to design a turbine that will self-start. Moreover, this paper summarizes the main research approaches for studying the turbine in order to identify successes and promising areas for future study.

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Sun, Ke, Gang Ma, Hongwei Wang, and Zhichuan Li. "Hydrodynamic performance of a vertical axis tidal current turbine with angular speed fluctuation." Ships and Offshore Structures 14, sup1 (2019): 311–19. http://dx.doi.org/10.1080/17445302.2019.1589975.

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Zhang, Wanchao, Yujie Zhou, Kai Wang, and Xiaoguo Zhou. "Forced Motion CFD Simulation and Load Refinement Evaluation of Floating Vertical-Axis Tidal Current Turbines." Polish Maritime Research 27, no. 3 (2020): 40–49. http://dx.doi.org/10.2478/pomr-2020-0045.

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AbstractSimulation of the hydrodynamic performance of a floating current turbine in a combined wave and flow environment is important. In this paper, ANSYS-CFX software is used to analyse the hydrodynamic performance of a vertical-axis turbine with various influence factors such as tip speed ratio, pitching frequency and amplitude. Time-varying curves for thrust and lateral forces are fitted with the least squares method; the added mass and damping coefficients are refined to analyse the influence of the former factors. The simulation results demonstrate that, compared with non-pitching and rotating turbines under constant inflow, the time-varying load of rotating turbines with pitching exhibits an additional fluctuation. The pitching motion of the turbine has a positive effect on the power output. The fluctuation amplitudes of thrust and lateral force envelope curves have a positive correlation with the frequency and amplitude of the pitching motion and tip speed ratio, which is harmful to the turbine’s structural strength. The mean values of the forces are slightly affected by pitching frequencies and amplitudes, but positively proportional to the tip speed ratio of the turbine. Based upon the least squares method, the thrust and lateral force coefficients can be divided into three components, uniform load coefficient, added mass and damping coefficients, the middle one being significantly smaller than the other two. Damping force plays a more important role in the fluctuation of loads induced by pitching motion. These results can facilitate study of the motion response of floating vertical-axis tidal current turbine systems in waves.

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Utama, I. Ketut Aria Pria, Dendy Satrio, Mukhtasor Mukhtasor, et al. "Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine." Journal of Mechanical Engineering and Sciences 14, no. 3 (2020): 6982–92. http://dx.doi.org/10.15282/jmes.14.3.2020.02.0547.

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The main disadvantage of the vertical-axis turbine is its low coefficient of performance. The purpose of this work was to propose a method to improve this performance by investigating the hydrodynamic forces and the flow-field of a foil that was modified with a sinusoidal leading-edge tubercle. NACA 63(4)021 was chosen as the original foil since it has a symmetrical profile that is suitable for use on a vertical-axis tidal-current turbine. The study was conducted using a numerical simulation method with ANSYS-CFX Computational Fluid Dynamics (CFD) code to solve the incompressible Reynolds-Averaged Navier-Stokes (RANS) equations. Firstly, the simulation results of the original foil were validated with available experimental data. Secondly, the modified foils, with three configurations of tubercles, were modelled. From the simulation results, the tubercle foils, when compared with the original foil, had similar lift performances at low Angles of Attack (0-8 degrees of AoA), lower lift performances at medium AoA (8-19 degrees) and higher lift performances at high AoA (19-32 degrees). A tubercle foil with Height/Chord (H/C) of 0.05 can maintain the static stall condition until 32 degrees. Therefore, a vertical-axis turbine with tubercle-blades provides an opportunity to increase its performance by extending the operational range for extracting energy in the dynamic stall condition.

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De Marco, Agostino, Domenico P. Coiro, Domenico Cucco, and Fabrizio Nicolosi. "A Numerical Study on a Vertical-Axis Wind Turbine with Inclined Arms." International Journal of Aerospace Engineering 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/180498.

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This work focuses on a particular type of vertical-axis wind turbine, in which a number of inclined arms with airfoil-shaped cross-sections are mounted to connect the principal blades to their hub. While the majority of the known studies on vertical-axis turbines is devoted to the role of principal blades, in most of the cases without taking into account other parts of the wind turbine, the objective of this work is to investigate the effect of uncommon arm geometries, such as the inclined arms. The inclined arms are known to have a potentially beneficial role in the power extraction from the wind current but, due to the complexity of the phenomena, the investigation on aerodynamics of this type of turbine is often impossible through analytical models, such as blade-element momentum theory. It turns out that adequate studies can only be carried out by wind tunnel experiments or CFD simulations. This work presents a methodical CFD study on how inclined arms can be used on a selected wind turbine configuration to harvest additional power from the wind. The turbine configuration, geometry, and some fundamental definitions are introduced first. Then an in-depth CFD analysis is presented and discussed.

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Li, Guangnian, Qingren Chen, and Hanbin Gu. "An Unsteady Boundary Element Model for Hydrodynamic Performance of a Multi-Blade Vertical-Axis Tidal Turbine." Water 10, no. 10 (2018): 1413. http://dx.doi.org/10.3390/w10101413.

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An unsteady boundary element model is developed to simulate the unsteady flow induced by the motion of a multi-blade vertical axis turbine. The distribution of the sources, bound vortices and wake vortices of the blades are given in detail. In addition, to make the numerical solution more robust, the Kutta condition is also introduced. The developed model is used to predict the hydrodynamic performance of a vertical axis tidal turbine and is validated by comparison with experimental data and other numerical solutions available in the literature. Good agreement is achieved and the calculation of the proposed model is simpler and more efficient than prior numerical solutions. The proposed model shows its capability for future profile design and optimization of vertical axis tidal turbines.

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Li, Ye, and Sander M. Calisal. "Three-dimensional effects and arm effects on modeling a vertical axis tidal current turbine." Renewable Energy 35, no. 10 (2010): 2325–34. http://dx.doi.org/10.1016/j.renene.2010.03.002.

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