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Articoli di riviste sul tema "HORIZONTAL AXIS HYDROKINETIC"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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1

Rahuna, Daif, Erwandi, Afian Kasharjanto, Eko Marta Suyanto e Cahyadi Sugeng Jati Mintarso. "Experimental Study on Hydrodynamic Aspects of Turbine which Convert Hydrokinetic and Potential Coastal Wave Energy". IOP Conference Series: Earth and Environmental Science 1166, n. 1 (1 maggio 2023): 012021. http://dx.doi.org/10.1088/1755-1315/1166/1/012021.

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Abstract Currently, the exploration of ocean renewable energy sources was mostly carried out to obtain optimal results and low cost. The waves that arrive on the beach consist of both potential energy where the water surface moves up and down and hydrokinetic energy where the volume of water comes and goes into the beach sand. They had the potential to be converted to electricity. This paper explained the study of the hydrodynamic aspects of turbines that convert hydrokinetic and potential coastal wave energy. The vertical axis darrieus turbine was modified to catch both energies. It could convert energies from hydrokinetics and the potential of waves simultaneously, whereas a vertical axis turbine with 6 horizontal blades and 3 vertical blades in a shaft. Testing was done at the testing Tank, Hydrodynamic Technology Research Center, National Research and Innovation Agency. The hydrodynamic tests were with 3 turbine variations, wave variations, and current velocity. The test results, vertical axis turbines with horizontal blades could receive wave energy, due to the orbital motion of water particles and vertical blades were very effective in receiving current energy so that turbines with 2 types of vertical and horizontal blades could convert wave and current energy.

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2

Contreras, L. T., Y. U. López e S. Laín. "CFD Simulation of a Horizontal Axis Hydrokinetic Turbine". Renewable Energy and Power Quality Journal 1, n. 15 (aprile 2017): 512–17. http://dx.doi.org/10.24084/repqj15.376.

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3

Cardona-Mancilla, Cristian, Jorge Sierra del Río, Edwin Chica-Arrieta e Diego Hincapié-Zuluaga. "Turbinas hidrocinéticas de eje horizontal: una revisión de la literatura". Tecnología y ciencias del agua 09, n. 3 (1 giugno 2018): 180–97. http://dx.doi.org/10.24850/j-tyca-2018-03-08.

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4

Wang, Xiu, Zhou-Ping Hu, Yan Yan, Junxian Pei e Wen-Quan Wang. "Acoustic characteristics of a horizontal axis micro hydrokinetic turbine". Ocean Engineering 259 (settembre 2022): 111854. http://dx.doi.org/10.1016/j.oceaneng.2022.111854.

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5

Zahedi Nejad, A., M. Rad e M. Khayat. "Conceptual duct shape design for horizontal-axis hydrokinetic turbines". Scientia Iranica 23, n. 5 (1 ottobre 2016): 2113–24. http://dx.doi.org/10.24200/sci.2016.3942.

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6

Abutunis, Abdulaziz, e Venkata Gireesh Menta. "Comprehensive Parametric Study of Blockage Effect on the Performance of Horizontal Axis Hydrokinetic Turbines". Energies 15, n. 7 (1 aprile 2022): 2585. http://dx.doi.org/10.3390/en15072585.

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When a hydrokinetic turbine operates in a confined flow, blockage effects are introduced, altering the flow at and downstream of the rotor. Blockage effects have a significant effect on the loading and performance of turbines. As a result, understanding them is critical for hydrokinetic turbine design and performance prediction. The current study examines the main and interaction effects of solidity (σ), tip speed ratio (TSR), blockage ratio (ε), and pitch angle (θ) on how the blockage influences the performance (CP) of a three-bladed, untwisted, untapered horizontal axis hydrokinetic turbine. The investigation is based on validated 3D computational fluid dynamics (CFD), design of experiments (DOE), and the analysis of variance (ANOVA) approaches. A total number of 36 CFD models were developed and meshed. A total of 108 CFD cases were performed as part of the analysis. Results indicated that the effect of varying θ was only noticeable at the high TSR. Additionally, the rate of increment of CP with respect to ε was found proportional to both TSR and σ. The power and thrust coefficients were affected the most by σ, followed by ε, TSR, and then θ.

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Menéndez Arán, David, e Ángel Menéndez. "Surrogate-Based Optimization of Horizontal Axis Hydrokinetic Turbine Rotor Blades". Energies 14, n. 13 (5 luglio 2021): 4045. http://dx.doi.org/10.3390/en14134045.

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A design method was developed for automated, systematic design of hydrokinetic turbine rotor blades. The method coupled a Computational Fluid Dynamics (CFD) solver to estimate the power output of a given turbine with a surrogate-based constrained optimization method. This allowed the characterization of the design space while minimizing the number of analyzed blade geometries and the associated computational effort. An initial blade geometry developed using a lifting line optimization method was selected as the base geometry to generate a turbine blade family by multiplying a series of geometric parameters with corresponding linear functions. A performance database was constructed for the turbine blade family with the CFD solver and used to build the surrogate function. The linear functions were then incorporated into a constrained nonlinear optimization algorithm to solve for the blade geometry with the highest efficiency. A constraint on the minimum pressure on the blade could be set to prevent cavitation inception.

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8

Nachtane, M., M. Tarfaoui, A. El Moumen, D. Saifaoui e H. Benyahia. "Design and Hydrodynamic Performance of a Horizontal Axis Hydrokinetic Turbine". International Journal of Automotive and Mechanical Engineering 16, n. 2 (4 luglio 2019): 6453–69. http://dx.doi.org/10.15282/ijame.16.2.2019.1.0488.

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Marine energy is gaining more and more interest in recent years and, in comparison to fossil energy, is very attractive due to predictable energy output, renewable and sustainable, the Horizontal Axis Hydrokinetic Turbine (HAHT) is one of the most innovative energy systems that allow transforms the kinetic energy into electricity. This work presents a new series of hydrofoil sections, named here NTSXX20, and was designed to work at different turbine functioning requirement. These hydrofoils have excellent hydrodynamic characteristics at the operating Reynolds number. The design of the turbine has been done utilising XFLR5 code and QBlade which is a Blade-Element Momentum solver with a blade design feature. Tidal current turbine has been able to capture about 50% from TSR range of 5 to 9 with maximum CPower of 51 % at TSR=6,5. The hydrodynamics performance for the CFD cases was presented and was employed to explain the complete response of the turbine.

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Abutunis, A., G. Taylor, M. Fal e K. Chandrashekhara. "Experimental evaluation of coaxial horizontal axis hydrokinetic composite turbine system". Renewable Energy 157 (settembre 2020): 232–45. http://dx.doi.org/10.1016/j.renene.2020.05.010.

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Shinomiya, L. D., J. R. P. Vaz, A. L. A. Mesquita, T. F. De Oliveira, A. C. P. Brasil Jr e P. A. S. F. Silva. "AN APPROACH FOR THE OPTIMUM HYDRODYNAMIC DESIGN OF HYDROKINETIC TURBINE BLADES". Revista de Engenharia Térmica 14, n. 2 (31 dicembre 2015): 43. http://dx.doi.org/10.5380/reterm.v14i2.62131.

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This work aims to develop a simple and efficient mathematical model applied to optimization of horizontal-axis hydrokinetic turbine blades considering the cavitation effect. The approach uses the pressure minimum coefficient as a criterion for the cavitation limit on the flow around the hydrokinetic blades. The methodology corrects the chord and twist angle at each blade section by a modification on the local thrust coefficient in order to takes into account the cavitation on the rotor shape. The optimization is based on the Blade Element Theory (BET), which is a well known method applied to design and performance analysis of wind and hydrokinetic turbines, which usually present good agreement with experimental data. The results are compared with data obtained from hydrokinetic turbines designed by the classical Glauert's optimization. The present method yields good behavior, and can be used as an alternative tool in efficient hydrokinetic turbine designs.

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Bentes, M. H. C., J. J. A. Lopes, K. A. Pinheiro, S. De S. Custódio Filho, J. R. P. Vaz e A. L. A. Mesquita. "Torques and Moments of Inertia Models for Horizontal Axis Hydrokinetic Turbine Driveline". Trends in Computational and Applied Mathematics 24, n. 2 (24 maggio 2023): 229–44. http://dx.doi.org/10.5540/tcam.2023.024.02.00229.

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The quantification of torques and moments of inertia of horizontal axis hydrokinetic turbine driveline is important to precisely predict the dynamic behavior of the complete system. Initially, this paper presents different models used in the literature for describing torques and moments of inertia of turbine components. A dynamic model of a small hydrokinetic turbine using belt transmission is developed. The model uses the Blade Element Momentum (BEM) for determining the power coefficient of the turbine rotor and considers the inertial effects and dissipative torques of whole system using some of the torque models and moments of inertia described previously. The results for the dynamical behavior of the turbine model are compared with experimental data, showing good agreement. In order to numerically analyze a more efficient drivetrain, the belt transmission is replaced by a planetary gearbox in the dynamic model, and the new results are also assessed. As a result, it was found that with planetary gears, a more compact transmission can be used, reducing the inertial effects, which brings a better efficiency in the starting of the machine and shortening the transient regime time.

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Aguilar, Jonathan, Ainhoa Rubio-Clemente, Laura Velasquez e Edwin Chica. "Design and Optimization of a Multi-Element Hydrofoil for a Horizontal-Axis Hydrokinetic Turbine". Energies 12, n. 24 (9 dicembre 2019): 4679. http://dx.doi.org/10.3390/en12244679.

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Hydrokinetic turbines are devices that harness the power from moving water of rivers, canals, and artificial currents without the construction of a dam. The design optimization of the rotor is the most important stage to maximize the power production. The rotor is designed to convert the kinetic energy of the water current into mechanical rotation energy, which is subsequently converted into electrical energy by an electric generator. The rotor blades are critical components that have a large impact on the performance of the turbine. These elements are designed from traditional hydrodynamic profiles (hydrofoils), to directly interact with the water current. Operational effectiveness of the hydrokinetic turbines depends on their performance, which is measured by using the ratio between the lift coefficient (CL) and the drag coefficient (CD) of the selected hydrofoil. High lift forces at low flow rates are required in the design of the blades; therefore, the use of multi-element hydrofoils is commonly regarded as an adequate solution to achieve this goal. In this study, 2D CFD simulations and multi-objective optimization methodology based on surrogate modelling were conducted to design an appropriate multi-element hydrofoil to be used in a horizontal-axis hydrokinetic turbine. The Eppler 420 hydrofoil was utilized for the design of the multi-element hydrofoil composed of a main element and a flap. The multi-element design selected as the optimal one had a gap of 2.825% of the chord length (C1), an overlap of 8.52 %C1, a flap deflection angle (δ) of 19.765°, a flap chord length (C2) of 42.471 %C1, and an angle of attack (α) of –4°.

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Abutunis, A., M. Fal, O. Fashanu, K. Chandrashekhara e L. Duan. "Coaxial horizontal axis hydrokinetic turbine system: Numerical modeling and performance optimization". Journal of Renewable and Sustainable Energy 13, n. 2 (marzo 2021): 024502. http://dx.doi.org/10.1063/5.0025492.

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14

SILVA, PAULO A. S. F., TAYGOARA F. DE OLIVEIRA, ANTONIO C. P. BRASIL JUNIOR e JERSON R. P. VAZ. "Numerical Study of Wake Characteristics in a Horizontal-Axis Hydrokinetic Turbine". Anais da Academia Brasileira de Ciências 88, n. 4 (1 dicembre 2016): 2441–56. http://dx.doi.org/10.1590/0001-3765201620150652.

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15

Shahsavarifard, Mohammad, e Eric Louis Bibeau. "Performance characteristics of shrouded horizontal axis hydrokinetic turbines in yawed conditions". Ocean Engineering 197 (febbraio 2020): 106916. http://dx.doi.org/10.1016/j.oceaneng.2020.106916.

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Shahsavarifard, Mohammad, Eric Louis Bibeau e Vijay Chatoorgoon. "Effect of shroud on the performance of horizontal axis hydrokinetic turbines". Ocean Engineering 96 (marzo 2015): 215–25. http://dx.doi.org/10.1016/j.oceaneng.2014.12.006.

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17

Amarante Mesquita, André Luiz, Alexandre Luiz Amarante Mesquita, Felipe Coutinho Palheta, Jerson Rogério Pinheiro Vaz, Marcus Vinicius Girão de Morais e Carmo Gonçalves. "A methodology for the transient behavior of horizontal axis hydrokinetic turbines". Energy Conversion and Management 87 (novembre 2014): 1261–68. http://dx.doi.org/10.1016/j.enconman.2014.06.018.

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18

Sherbaz, Salma. "Design and Optimization of a Diffuser for a Horizontal Axis Hydrokinetic Turbine using Computational Fluid Dynamics based Surrogate Modelling". Mechanics 26, n. 2 (20 aprile 2020): 161–70. http://dx.doi.org/10.5755/j01.mech.26.2.23511.

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Fossil fuels have remained at the backbone of the global energy portfolio. With the growth in the number of factories, population, and urbanization; the burden on fossil fuels has also been increasing. Most importantly, fossil fuels have been causing damage to the global climate since industrialization. The stated issues can only be resolved by shifting to environment friendly alternate energy options. The horizontal axis hydrokinetic turbine is considered as a viable option for renewable energy production. The aim of this project is the design and optimization of a diffuser for horizontal axis hydrokinetic turbine using computational fluid dynamics based surrogate modeling. The two-dimensional flat plate airfoil is used as a benchmark and flow around the airfoil is simulated using Ansys Fluent. Later, computational fluid dynamics analyses are carried out for baseline diffuser generated from the flat plate airfoil. The performance of this diffuser was optimized by achieving an optimum curved profile at the internal surface of the diffuser. The response surface methodology is used as a tool for optimization. A maximum velocity augmentation of 31.70% is achieved with the optimum diffuser.

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19

Wang, Wen-Quan, Rui Yin e Yan Yan. "Design and prediction hydrodynamic performance of horizontal axis micro-hydrokinetic river turbine". Renewable Energy 133 (aprile 2019): 91–102. http://dx.doi.org/10.1016/j.renene.2018.09.106.

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Dou, Bingzheng, Michele Guala, Liping Lei e Pan Zeng. "Wake model for horizontal-axis wind and hydrokinetic turbines in yawed conditions". Applied Energy 242 (maggio 2019): 1383–95. http://dx.doi.org/10.1016/j.apenergy.2019.03.164.

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21

Mannion, Brian, Vincent McCormack, Ciaran Kennedy, Seán B. Leen e Stephen Nash. "An experimental study of a flow-accelerating hydrokinetic device". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, n. 1 (1 maggio 2018): 148–62. http://dx.doi.org/10.1177/0957650918772626.

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Tidal energy researchers and developers use experimental testing of scaled devices as a method of evaluating device performance. Much of the focus to date has been on horizontal axis turbines. This study is focused on a novel vertical axis turbine which incorporates variable-pitch blades and a flow accelerator. The research involves laboratory testing of scale model devices in a recirculating flume. Computational fluid dynamic modelling is used to reproduce the measured flow data to investigate disparities in experimental data. The results show that the device is capable of achieving localised flow acceleration of up to a factor of 2 above the freestream velocity and achieved a mechanical power efficiency of 40%.

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Vaz, J. R. P., T. H. S. Moreira, D. T. Brandão, J. J. A. Lopes, S. W. O. Figueiredo, A. L. A. Mesquita, M. A. B. Galhardo e C. J. C. Blanco. "TRANSIENT MODELING OF A SMALL HYDROKINETIC TURBINE". Revista de Engenharia Térmica 14, n. 2 (31 dicembre 2015): 63. http://dx.doi.org/10.5380/reterm.v14i2.62136.

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In recent years, great attention has been given to the study of hydrokinetic turbines for power generation. Such importance is due to the use of clean energy technology by using renewable sources. Therefore, this work aims to present a relevant methodology for the efficient design of horizontal-axis hydrokinetic turbines with variable rotational speed. This methodology includes the Blade Element Method (BEM) for determining the turbine power coefficient, since BEM is widely used in the hydrokinetic turbine design due to its good agreement with experimental data. In addition, the dynamic equation of the driveline is used, taking into account the BEM to provide the rotor hydrodynamic torque coupled with the drive train model, including the multiplier and the electric generator. In this case, the modeling of the whole system comprises the hydrodynamic information of the rotor, the mass-moment of inertia, frictional losses and electromagnetic torque imposed by the generator. The theoretical results were obtained for the transient rotational speed and compared with field data measured from small hydrokinetic turbine installed at the Arapiranga-Açu creek, which is located in the city of Acará, Pará, Brazil.

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Rubio-Clemente, A., J. Aguilar e E. Chica. "Performance evaluation of high-lift hydrofoils with a flap used in the design of horizontal-axis hydrokinetic turbines". Renewable Energy and Power Quality Journal 19 (settembre 2021): 391–95. http://dx.doi.org/10.24084/repqj19.302.

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The hydrodynamic performance and the flow field of two horizontal-axis hydrokinetic turbines with and without a high-lift hydrofoil with a flap were investigated using computational fluid dynamics (CFD) simulation. For improving the accuracy of the numerical simulation, the user-defined function (UDF) of 6-degrees of freedom (6-DoF) was used in the Ansys Fluent software. Unsteady Reynolds-averaged Navier–Stokes (URANS) equations coupled to the SST 𝑘 − 𝜔 turbulence model were employed during the simulation. A three-dimensional model of both of the turbines with three blades was conducted for obtaining the performance curve of the power coefficient (𝐶𝑃) versus the tip speed ratio (TSR). The maximum power coefficients (𝐶𝑃𝑀𝑎𝑥) of the hydrokinetic turbines with and without a high-lift hydrofoil arrangement were 0.5050 and 0.419, respectively. Experimental data from the literature were used for the validation of the numerical results, specifically for the case when a rotor with traditional blades is utilized. In general, the simulation results were in good agreement with the experimental data.

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Contreras, Leidy, Omar Lopez e Santiago Lain. "Computational Fluid Dynamics Modelling and Simulation of an Inclined Horizontal Axis Hydrokinetic Turbine". Energies 11, n. 11 (14 novembre 2018): 3151. http://dx.doi.org/10.3390/en11113151.

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In this contribution, unsteady three-dimensional numerical simulations of the water flow through a horizontal axis hydrokinetic turbine (HAHT) of the Garman type are performed. This study was conducted in order to estimate the influence of turbine inclination with respect to the incoming flow on turbine performance and forces acting on the rotor, which is studied using a time-accurate Reynolds-averaged Navier-Stokes (RANS) commercial solver. Changes of the flow in time are described by a physical transient model based on two domains, one rotating and the other stationary, combined with a sliding mesh technique. Flow turbulence is described by the well-established Shear Stress Transport (SST) model using its standard and transitional versions. Three inclined operation conditions have been analyzed for the turbine regarding the main stream: 0° (SP configuration, shaft parallel to incoming velocity), 15° (SI15 configuration), and 30° (SI30 configuration). It was found that the hydrodynamic efficiency of the turbine decreases with increasing inclination angles. Besides, it was obtained that in the inclined configurations, the thrust and drag forces acting on rotor were lower than in the SP configuration, although in the former cases, blades experience alternating loads that may induce failure due to fatigue in the long term. Moreover, if the boundary layer transitional effects are included in the computations, a slight increase in the power coefficient is computed for all inclination configurations.

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Gish, L. A., A. Carandang e G. Hawbaker. "Experimental evaluation of a shrouded horizontal axis hydrokinetic turbine with pre-swirl stators". Ocean Engineering 204 (maggio 2020): 107252. http://dx.doi.org/10.1016/j.oceaneng.2020.107252.

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Tian, Wenlong, Zhaoyong Mao e Hao Ding. "Design, test and numerical simulation of a low-speed horizontal axis hydrokinetic turbine". International Journal of Naval Architecture and Ocean Engineering 10, n. 6 (novembre 2018): 782–93. http://dx.doi.org/10.1016/j.ijnaoe.2017.10.006.

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Ciocănea, Adrian, Sergiu Nicolaie e Corina Băbuţanu. "Reverse Engineering for the Rotor Blades of a Horizontal Axis Micro-hydrokinetic Turbine". Energy Procedia 112 (marzo 2017): 35–42. http://dx.doi.org/10.1016/j.egypro.2017.03.1056.

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Diego, Betancur, Ardila Gonzalo e Chica Lenin. "Design and hydrodynamic analysis of horizontal-axis hydrokinetic turbines with three different hydrofoils by CFD". Journal of Applied Engineering Science 18, n. 4 (2020): 529–36. http://dx.doi.org/10.5937/jaes0-25273.

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The conversion of kinetic energy that comes from low-head water currents to electrical energy has gained importance in recent years due to its low environmental and social impact. Horizontal axis hydrokinetic turbines are one of the most used devices for the conversion of this type of energy [1], being an emerging technology more studies are required to improve the understanding and functioning of these devices. In this context, the hydrodynamic study to obtain the characteristic curves of the turbines are fundamental. This article presents the design and hydrodynamic analysis for three horizontal axis tri-blade hydrokinetic turbine rotors with commercial profiles (NACA 4412, EPPLER E817 and NRELS802). The Blade Element Momentum (BEM) was used to design three rotors. The DesignModeler, Meshing and CFX modules from the ANSYS® commercial package were used to discretize the control volumes and configure the numerical study. In addition, Grid Convergence Index (GCI) analysis was performed to evaluate the precision of the results. The computational fluid dynamics (CFD) was used to observe the behavior of the fluid by varying the speed of rotation of the turbines from 0.1 rad s-1 to 40 rad s-1, obtaining power coefficient of 0.390 to 0.435. For a maximum shaft power of 105W. In addition, it is evident that for the same conditions the rotor designed with the EPPLER E817 profile presents better performance than built with the NACA4412 and NREL S802.

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Rodríguez, L., A. Benavides-Moran e S. Laín. "Three-Bladed Horizontal Axis Water Turbine Simulations with Free Surface Effects". International Journal of Applied Mechanics and Engineering 26, n. 3 (26 agosto 2021): 187–97. http://dx.doi.org/10.2478/ijame-2021-0044.

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Abstract The water level above a hydrokinetic turbine is likely to vary throughout the season and even along the day. In this work, the influence of the free surface on the performance of a three bladed horizontal-axis turbine is explored by means of a three-dimensional, transient, two-phase flow computational model implemented in the commercial CFD software ANSYS Fluent 19.0. The k – ω SST Transition turbulence model coupled with the Volume of Fluid (VOF) method is used to track the air-water interface. The rotor diameter is D = 0 8m. Two operating conditions are analyzed: deep tip immersion (0.55D) and shallow tip immersion (0.19D). Three tip speed ratios are evaluated for each immersion. Simulation results show a good agreement with experimental data reported in the literature, although the computed torque and thrust coefficients are slightly underestimated. Details of the free surface dynamics, the flow past the turbine and the wake near the rotor are also discussed.

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Yangyozov, Anastas Todorov, Damjanka Stojanova Dimitrova e Lazar Georgiev Panayotov. "Modeling and performance calculation of a horizontal axis wind and hydrokinetic turbine: Numerical study". ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 2, n. 2 (21 dicembre 2018): 70–79. http://dx.doi.org/10.29114/ajtuv.vol2.iss2.95.

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A small turbine, working with air and water to generate electricity, was designed and its performance was reported in this paper. The rotor diameter is 150mm. The numerical calculations of the power coefficient, torque, and tip speed ratio of turbine were carried out for a wide range of inlet velocities. The flow passing through the turbine was investigated with commercial CFD code ANSYS CFX 18

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Subhra Mukherji, Suchi, Nitin Kolekar, Arindam Banerjee e Rajiv Mishra. "Numerical investigation and evaluation of optimum hydrodynamic performance of a horizontal axis hydrokinetic turbine". Journal of Renewable and Sustainable Energy 3, n. 6 (novembre 2011): 063105. http://dx.doi.org/10.1063/1.3662100.

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Muñoz, A. H., L. E. Chiang e E. A. De la Jara. "A design tool and fabrication guidelines for small low cost horizontal axis hydrokinetic turbines". Energy for Sustainable Development 22 (ottobre 2014): 21–33. http://dx.doi.org/10.1016/j.esd.2014.05.003.

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Aguilar, Jonathan, Laura Isabel Velásquez, Ainhoa Rubio Clemente e Edwin Chica. "Numerical analysis on the use of multi-element blades in a horizontal-axis hydrokinetic turbine". Journal of Mechanical Engineering and Sciences 14, n. 4 (17 dicembre 2020): 7328–47. http://dx.doi.org/10.15282/jmes.14.4.2020.02.0576.

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The blades of a hydrokinetic turbine have a great impact on its performance due to they are the elements responsible for capturing the kinetic energy from water and transform it into rotational mechanical energy. In this work, numerical analyses on the performance of a multi-element blade section were developed. The lift and drag coefficients (CL and CD, respectively) of the hydrofoils with traditional and multi-element configurations were studied. For this purpose, 2D numerical analyses were conducted by using JavaFoil code. S805, S822, Eppler 420, Eppler 421, Eppler 422, Eppler 423, Eppler 857, Wortmann FX 74-CL5-140, Wortmann FX 74-CL5-140 MOD, Douglas/Liebeck LA203A, Selig S1210, Selig S1223 and UI-1720 profiles were tested. The results indicated that the Eppler 420 multi-element hydrofoil provided high efficiency to the turbine. This was attributed to its higher relationship between the maximum CL and CD (CLmax /CD), which was equal to 47.77, compared to that of the Selig S1223 profile (39.59) and other hydrofoils studied. Therefore, the final optimized blade section selected was an Eppler 420 multi-element hydrofoil with a flap chord length of 70% of that of the main profile. The hydrodynamic and structural designs of the optimized blade section were validated with detailed 3D numerical models, through ANSYs Fluent software. The fluid and structural domains were connected using one-way coupling. The influence of the blade geometry and the operational parameters on the stresses supported by the blades were found by analyzing the fluid-structure interaction. From the numerical analyses conducted, it was observed that the blades did not exhibit structural fails. In this regard, the multi-element hydrofoil might be used for the design of a horizontal-axis hydrokinetic turbine with a high efficiency.

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34

Vaz, Jerson R. P., Adry K. F. de Lima e Erb F. Lins. "Assessment of a Diffuser-Augmented Hydrokinetic Turbine Designed for Harnessing the Flow Energy Downstream of Dams". Sustainability 15, n. 9 (7 maggio 2023): 7671. http://dx.doi.org/10.3390/su15097671.

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Harnessing the remaining energy downstream of dams has recently gained significant attention as the kinetic energy available in the water current is considerable. This work developed a novel study to quantify the energy gain downstream of dams using a horizontal-axis hydrokinetic turbine with a diffuser. The present assessment uses field data from the Tucuruí Dam, where a stream velocity of 2.35 m/s is the velocity at which the highest energy extraction can occur. In this case, a 3-bladed hydrokinetic turbine with a 10 m diameter, shrouded by a flanged conical diffuser, was simulated. Numerical modeling using computational fluid dynamics was carried out using the Reynolds averaged Navier–Stokes formulation with the κ – ω shear stress transport as the turbulence model. The results yield good agreement with experimental and theoretical data available in the literature. Moreover, the turbine power coefficient under the diffuser effect could increase by about 55% for a tip speed ratio of 5.4, and the power output increased by about 1.5 times when compared to the same turbine without a diffuser. Additionally, as there are no hydrokinetic turbines installed downstream of dams in the Amazon region, the present study is relevant as it explores the use of hydrokinetic turbines as an alternative for harnessing the turbined and verted flow from dams. This alternative may help avoid further environmental impacts caused by the need for structural extensions.

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35

Dang, Zhigao, Zhaoyong Mao, Baowei Song e Wenlong Tian. "Noise Characteristics Analysis of the Horizontal Axis Hydrokinetic Turbine Designed for Unmanned Underwater Mooring Platforms". Journal of Marine Science and Engineering 7, n. 12 (17 dicembre 2019): 465. http://dx.doi.org/10.3390/jmse7120465.

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Operating horizontal axis hydrokinetic turbine (HAHT) generates noise affecting the ocean environment adversely. Therefore, it is essential to determine the noise characteristics of such types of HAHT, as large-scale turbine sets would release more noise pollution to the ocean. Like other rotating machinery, the hydrodynamic noise generated by the rotating turbine has been known to be the most important noise source. In the present work, the transient turbulent flow field of the HAHT is obtained by incompressible large eddy simulation, thereafter, the Ffowcs Williams and Hawkings acoustic analogy formulation is carried out to predict the noise generated from the pressure fluctuations of the blade surface. The coefficient of power is compared with the experimental results, with a good agreement being achieved. It is seen from the pressure contours that the 80% span of the blade has the most severe pressure fluctuations, which concentrate on the region of leading the edge of the airfoil and the suction surface of the airfoil. Then, the noise characteristics around a single turbine are systematically studied, in accordance with the results of the flow field. The noise characteristics around the whole turbine are also investigated to determine the directionality of the noise emission of HAHT.

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36

Nigam, Suyash, Shubham Bansal, Tanmay Nema, Vansh Sharma e Raj Kumar Singh. "Design and Pitch Angle Optimisation of Horizontal Axis Hydrokinetic Turbine with Constant Tip Speed Ratio". MATEC Web of Conferences 95 (2017): 06004. http://dx.doi.org/10.1051/matecconf/20179506004.

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37

Barbarić, Marina, e Zvonimir Guzović. "Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines". Energies 13, n. 17 (2 settembre 2020): 4560. http://dx.doi.org/10.3390/en13174560.

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Abstract (sommario):

Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements are investigated. Firstly, optimization-based design of rotor blade is used to get as close as possible to the efficiency limit of 59.3% (known as Betz limit), that counts for bare turbine rotors, placed in the free flow. Additional diffuser elements are further added to examine the potential to overcome the theoretical efficiency limit by accelerating water at the axial direction. Various diffuser geometrical configurations are investigated using the computational fluid dynamics (CFD) to obtain insight into hydrodynamics of augmented micro-hydrokinetic turbines. Moreover, the turbines are compared from the energy conversion efficiency point of view. The highest maximum power coefficient increase of 81% is obtained with brimmed (flanged) diffuser. Diffusers with foil-shaped cross-sections have also been analyzed but power augmentation is not significantly greater than in the case of simple cross-section designs of the same dimensions. The power coefficients’ comparison indicate that considerable power augmentation is achievable using brimmed diffuser with higher value of length-to-diameter ratio. However, the impact of diffuser length increase on the power coefficient enhancement becomes weaker as the length-to-diameter ratio reaches a value of 1.

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38

Zhou, Jiayan, Huijuan Guo, Yuan Zheng, Zhi Zhang, Cong Yuan e Bin Liu. "Research on Wake Field Characteristics and Support Structure Interference of Horizontal Axis Tidal Stream Turbine". Energies 16, n. 9 (4 maggio 2023): 3891. http://dx.doi.org/10.3390/en16093891.

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The harnessing and utilization of tidal current energy have emerged as prominent topics in scientific inquiry, due to their vast untapped resource potential, leading to numerous investigations into the efficacy of hydrokinetic turbines under various operational conditions. This paper delineates the wake field characteristics and performance of horizontal axis tidal stream turbines under the influence of support structures, using a comprehensively blade-resolved computational fluid dynamics (CFDs) model that employs Reynolds-averaged Navier–Stokes (RANS) equations in combination with the RNG k-ε turbulence model. To achieve this, the study utilized experimental tank tests and numerical simulations to investigate the distribution characteristics and recuperative principles of the turbine’s wake field. The velocity distribution and energy augmentation coefficient of the wake field showed strong agreement with the experimental results. To further assess the effect of support structures on the flow field downstream of the unit and its performance, the hydrodynamic attributes of the turbine wake field were analyzed with and without support structures. The interference elicited by the support structure modified the velocity distribution of the near-wake flow field, resulting in a 4.41% decrease in the turbine’s power coefficient (Cp), significantly impacting the turbine’s instantaneous performance.

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39

Ahmed Zaib, Mansoor, Arbaz Waqar, Shoukat Abbas, Saeed Badshah, Sajjad Ahmad, Muhammad Amjad, Seyed Saeid Rahimian Koloor e Mohamed Eldessouki. "Effect of Blade Diameter on the Performance of Horizontal-Axis Ocean Current Turbine". Energies 15, n. 15 (22 luglio 2022): 5323. http://dx.doi.org/10.3390/en15155323.

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Abstract (sommario):

The horizontal-axis ocean current turbine under investigation is a three-blade rotor that uses the flow of water to rotate its blade. The mechanical energy of a turbine is converted into electrical energy using a generator. The horizontal-axis ocean current turbine provides a nongrid robust and sustainable power source. In this study, the blade design is optimized to achieve higher efficiency, as the blade design of the hydrokinetic turbine has a considerable effect on its output efficiency. All the simulations of this turbine are performed on ANSYS software, based on the Reynolds Averaged Navier–Stokes (RANS) equations. Three-dimensional (CFD) simulations are then performed to evaluate the performance of the rotor at a steady state. To examine the turbine’s efficiency, the inner diameter of the rotor is varied in all three cases. The attained result concludes that the highest Cm value is about 0.24 J at a tip-speed ratio (TSR) of 0.8 at a constant speed of 0.7 m/s. From 1 TSR onward, a further decrease occurs in the power coefficient. That point indicates the optimum velocity at which maximum power exists. The pressure contour shows that maximum dynamic pressure exists at the convex side of the advancing blade. The value obtained at that place is −348 Pa for case 1. When the dynamic pressure increases, the power also increases. The same trend is observed for case 2 and case 3, with the same value of optimum TSR = 0.8.

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40

Aghsaee, Payam, e Corey D. Markfort. "Effects of flow depth variations on the wake recovery behind a horizontal-axis hydrokinetic in-stream turbine". Renewable Energy 125 (settembre 2018): 620–29. http://dx.doi.org/10.1016/j.renene.2018.02.137.

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41

Abutunis, Abdulaziz, Rafid Hussein e K. Chandrashekhara. "A neural network approach to enhance blade element momentum theory performance for horizontal axis hydrokinetic turbine application". Renewable Energy 136 (giugno 2019): 1281–93. http://dx.doi.org/10.1016/j.renene.2018.09.105.

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42

Fontaine, Arnie A., Ted G. Bagwell, Michael L. Johnson e Dean Capone. "A comprehensive water tunnel test of a horizontal axis marine hydrokinetic turbine for model validation and verification". Journal of the Acoustical Society of America 135, n. 4 (aprile 2014): 2273. http://dx.doi.org/10.1121/1.4877446.

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43

Chihaia, Rareş-Andrei, Lucia-Andreea El-Leathey, Gabriela Cîrciumaru e Nicolae Tănase. "Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model". E3S Web of Conferences 85 (2019): 06004. http://dx.doi.org/10.1051/e3sconf/20198506004.

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The objective of the paper is to study the influence of certain shroud types suitable for horizontal axis hydrokinetic turbines using experimental testing in order to increase the energy conversion efficiency. The scale model of the shrouded hydrokinetic turbine is tested on a dedicated experimental bench for axial hydraulic turbine models. Two types of shrouds were tested in order to be compared: convergent shroud and divergent shroud. The rotor and shroud were made using 3D printer technology and were tested at a water velocity of 0.9 m/s on the closed-circuit testing bench. The testing facility allows the determination of the power extracted for each shroud at five distinct positions. Thus, the rotor can be moved within the shroud from inlet to outlet in order to establish the proper operating position. The mechanical power is measured using a torque transducer and an electromagnetic particle brake. The testing results will be analysed based on the variation of power curves obtained for different shroud types and operating positions. The optimum design and the best operating position will be recommended by comparing the testing result with the data collected from the bare turbine using the same rotor placed directly in free flow.

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44

Maniaci, David C., e Ye Li. "Investigating the Influence of the Added Mass Effect to Marine Hydrokinetic Horizontal-Axis Turbines Using a General Dynamic Wake Wind Turbine Code". Marine Technology Society Journal 46, n. 4 (1 luglio 2012): 71–78. http://dx.doi.org/10.4031/mtsj.46.4.4.

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AbstractThis paper describes a recent study to investigate the applicability of a horizontal-axis wind turbine structural dynamics and unsteady aerodynamics analysis program (FAST and AeroDyn, respectively) for modeling the forces on marine hydrokinetic turbines. This paper summarizes the added mass model that has been added to AeroDyn. The added mass model only includes flow acceleration perpendicular to the rotor disc and ignores added mass forces caused by blade deflection. A model of the National Renewable Energy Laboratory’s Unsteady Aerodynamics Experiment Phase VI wind turbine was analyzed using FAST and AeroDyn with seawater conditions and the new added mass model. The results of this analysis exhibited a 3.6% change in thrust for a rapid pitch case and a slight change in amplitude and phase of thrust for a case with 30° of yaw.

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45

Javaherchi, Teymour, Nick Stelzenmuller e Alberto Aliseda. "Experimental and numerical analysis of the performance and wake of a scale–model horizontal axis marine hydrokinetic turbine". Journal of Renewable and Sustainable Energy 9, n. 4 (luglio 2017): 044504. http://dx.doi.org/10.1063/1.4999600.

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46

Dewhurst, Tobias, M. Robinson Swift, Martin Wosnik, Kenneth Baldwin, Judson DeCew e Matthew Rowell. "Dynamics of a Floating Platform Mounting a Hydrokinetic Turbine". Marine Technology Society Journal 47, n. 4 (1 luglio 2013): 45–56. http://dx.doi.org/10.4031/mtsj.47.4.13.

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AbstractA two-dimensional mathematical model was developed to predict the dynamic response of a moored, floating platform mounting a tidal turbine in current and waves. The model calculates heave, pitch, and surge response to collinear waves and current. Waves may be single frequency or a random sea with a specified spectrum. The mooring consists of a fixed anchor, heavy chain (forming a catenary), a lightweight elastic line, and a mooring ball tethered to the platform. The equations of motion and mooring equations are solved using a marching solution approach implemented using MATLAB. The model was applied to a 10.7-m twin-hulled platform used to deploy a 0.86-m shrouded, in-line horizontal axis turbine. Added mass and damping coefficients were obtained empirically using a 1/9 scale physical model in tank experiments. Full-scale tests were used to specify drag coefficients for the turbine and platform. The computer model was then used to calculate full-scale mooring loads, turbine forces, and platform motion in preparation for a full-scale test of the tidal turbine in Muskeget Channel, Massachusetts, which runs north-south between Martha’s Vineyard and Nantucket Island. During the field experiments, wave, current, and platform motion were recorded. The field measurements were used to compute response amplitude operators (RAOs), essentially normalized amplitudes or frequency responses for heave, pitch, and surge. The measured RAOs were compared with those calculated using the model. The very good agreement indicates that the model can serve as a useful design tool for larger test and commercial platforms.

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47

Benavides-Morán, Aldo, Luis Rodríguez-Jaime e Santiago Laín. "Numerical Investigation of the Performance, Hydrodynamics, and Free-Surface Effects in Unsteady Flow of a Horizontal Axis Hydrokinetic Turbine". Processes 10, n. 1 (30 dicembre 2021): 69. http://dx.doi.org/10.3390/pr10010069.

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This paper presents computational fluid dynamics (CFD) simulations of the flow around a horizontal axis hydrokinetic turbine (HAHT) found in the literature. The volume of fluid (VOF) model implemented in a commercial CFD package (ANSYS-Fluent) is used to track the air-water interface. The URANS SST k-ω and the four-equation Transition SST turbulence models are employed to compute the unsteady three-dimensional flow field. The sliding mesh technique is used to rotate the subdomain that includes the turbine rotor. The effect of grid resolution, time-step size, and turbulence model on the computed performance coefficients is analyzed in detail, and the results are compared against experimental data at various tip speed ratios (TSRs). Simulation results at the analyzed rotor immersions confirm that the power and thrust coefficients decrease when the rotor is closer to the free surface. The combined effect of rotor and support structure on the free surface evolution and downstream velocities is also studied. The results show that a maximum velocity deficit is found in the near wake region above the rotor centerline. A slow wake recovery is also observed at the shallow rotor immersion due to the free-surface proximity, which in turn reduces the power extraction.

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48

Gupta, Mahendra Kumar, e P. M. V. Subbarao. "Development of a semi-analytical model to select a suitable airfoil section for blades of horizontal axis hydrokinetic turbine". Energy Reports 6 (febbraio 2020): 32–37. http://dx.doi.org/10.1016/j.egyr.2019.08.014.

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49

Arrieta, Edwin Lenin Chica, Cristian Cardona-Mancilla, J. Slayton, F. Romero, Edwar Torres, Sergio Agudelo, Juan Jose Arbelaez e Diego Hincapie. "Experimental Investigations and CFD Simulations of the Blade Section Pitch Angle Effect on the Performance of a Horizontal-Axis Hydrokinetic Turbine". Engineering Journal 22, n. 5 (30 settembre 2018): 141–54. http://dx.doi.org/10.4186/ej.2018.22.5.141.

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50

Khan, M. J., G. Bhuyan, M. T. Iqbal e J. E. Quaicoe. "Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: A technology status review". Applied Energy 86, n. 10 (ottobre 2009): 1823–35. http://dx.doi.org/10.1016/j.apenergy.2009.02.017.

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