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Journal articles on the topic 'Helix wind turbines'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Gutknecht, Jonas, Anne Van Den Homberg, Jelle Linke, et al. "Synergizing Helix Active Wake Mixing with Dynamic Yawing: An Exploration Study using Porous Discs in a Wind Tunnel." Journal of Physics: Conference Series 3016, no. 1 (2025): 012014. https://doi.org/10.1088/1742-6596/3016/1/012014.

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Abstract Clustering multiple turbines in close vicinity gives rise to efficiency losses due to the energy extraction of upstream turbines, a phenomenon known as the wake effect. The risk wake-induced power losses pose for the economic feasibility of wind farm projects motivated several methodologies aimed at mitigating the wake effect by dynamically exciting one operational parameter of the upstream turbine. Among them are dynamic yawing, which sinusoidally varies the yaw angle of the turbine with the wind, and helix active wake control, which dynamically manipulates the turbine thrust. This s

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2

Mühle, Franz V., Florian M. Heckmeier, Filippo Campagnolo, and Christian Breitsamter. "Wind tunnel investigations of an individual pitch control strategy for wind farm power optimization." Wind Energy Science 9, no. 5 (2024): 1251–71. http://dx.doi.org/10.5194/wes-9-1251-2024.

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Abstract. This article presents the results of an experimental wind tunnel study which investigates a new control strategy named Helix. The Helix control employs individual pitch control for sinusoidally varying yaw and tilt moments to induce an additional rotational component in the wake, aiming to enhance wake mixing. The experiments are conducted in a closed-loop wind tunnel under low-turbulence conditions to emphasize wake effects. Highly sensorized model wind turbines with control capabilities similar to full-scale machines are employed in a two-turbine setup to assess wake recovery poten

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3

Mohammadi, Mohammad Mehdi, Warit Chanprasert, and Stefan Ivanell. "Assessment of loads and power generation for a wind farm utilizing Helix control strategy." Journal of Physics: Conference Series 3016, no. 1 (2025): 012022. https://doi.org/10.1088/1742-6596/3016/1/012022.

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Abstract This paper investigates the effectiveness of the Helix control strategy for a 3 × 3 wind farm in neutral atmospheric boundary layer flow using large eddy simulations of IEA 15MW wind turbines in terms of power production and blade and tower loadings. Various control scenarios are considered, with a maximum power gain of 7% obtained in the case where the first two columns of the wind farm are controlled with the Helix controller. It is shown that the power gain strongly depends on the phase difference of the first and second-column wind turbines’ Helix signal. However, we show that the

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4

Gutknecht, Jonas, Daniel Van Den Berg, Daan Van Der Hoek, et al. "Wake Recovery Enhancement with Helix Active Wake Control: Vortex Structures in a Porous Disk Wake Observed in PIV Experiments." Journal of Physics: Conference Series 3016, no. 1 (2025): 012030. https://doi.org/10.1088/1742-6596/3016/1/012030.

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Abstract Power losses at waked turbines due to the energy extraction of upstream turbines from the flow pose a major risk to the economic feasibility of wind farms. Helix active wake control has proven its potential to mitigate these wake-induced power losses by accelerating the recovery of the individual turbine wakes. This method leverages individual pitch control to induce a non-uniformly distributed force perturbation that rotates either in a clockwise (CW) or counterclockwise (CCW) direction around the rotor center. This deforms the wake into a helical shape that recovers faster than the

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5

De Vos, Brian, Bjorn M. Harder, Thomas A. Huisman, Jonas Gutknecht, and Jan-Willem Van Wingerden. "Mimicking the Helix with a porous disc for wind tunnel testing." Journal of Physics: Conference Series 2767, no. 9 (2024): 092063. http://dx.doi.org/10.1088/1742-6596/2767/9/092063.

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Abstract A promising method to reduce wake effects in offshore wind farms is the Helix approach, which increases the mixing of the wake with the surrounding flow by exciting the individual blade pitch. This increases the wind speed in the wake, resulting in a higher power output at a downstream turbine. Wind tunnel testing is crucial to gather further understanding of the governing mechanisms behind the Helix and its efficiency in larger wind farm arrays. However, model turbines are expensive and complex. Porous Discs (PD) have proven to supply a less expensive and less complex alternative for

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6

Van Der Hoek, Daan, Carlos Simão Ferreira, and Jan-Willem Van Wingerden. "Experimental comparison of induction control methods for wind farm power maximization on a scaled two-turbine setup." Journal of Physics: Conference Series 2767, no. 9 (2024): 092064. http://dx.doi.org/10.1088/1742-6596/2767/9/092064.

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Abstract Induction control methods offer a potential solution to minimizing wake effects that occur in large wind farms. This paper presents an experimental study on multiple induction control methods for wind farm power maximization. Wind tunnel experiments were conducted on two aligned scaled wind turbines. The upstream turbine was operated with static induction control, periodic dynamic induction control with collective pitch actuation, and dynamic individual pitch control (the helix approach). All wind farm control implementations were compared to a baseline case, which optimized the indiv

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7

Suryadi, Aris, Purwandito Tulus Asmoro, and Ahmad Solihin. "HYBRID ELECTRIC POWER PLANT USING WIND TURBINE SAVONIUS HELIX AND SOLAR CELL AS AN ALTERNATIVE POWER SOURCE IN THE LIGHTNING TOWER AT FLASHING LIGHTS." ADI Journal on Recent Innovation (AJRI) 1, no. 1 (2019): 1–6. http://dx.doi.org/10.34306/ajri.v1i1.3.

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Electrical Energy is a very important need, but the electrical energy we use today still comes from conventional power plants that have negative threats such as pollution and fossil fuel reserves that are decreasing. To overcome this, by utilizing alternative energy that is environmentally friendly, one of them is wind energy and solar energy. Hybrid power plants use savonius helix wind turbines and solar cells are made to minimize the use of conventional energy. This tool utilizes wind and solar energy as the main media of electricity generation. The wind turbine which is made is a type of he

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Suryadi, Aris, Purwandito Tulus Asmoro, and Ahmad Solihin. "HYBRID ELECTRIC POWER PLANT USING WIND TURBINE SAVONIUS HELIX AND SOLAR CELL AS AN ALTERNATIVE POWER SOURCE IN THE LIGHTNING TOWER AT FLASHING LIGHTS." ADI Journal on Recent Innovation (AJRI) 1, no. 1 (2019): 1–6. http://dx.doi.org/10.34306/ajri.v1i1.93.

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Electrical Energy is a very important need, but the electrical energy we use today still comes from conventional power plants that have negative threats such as pollution and fossil fuel reserves that are decreasing. To overcome this, by utilizing alternative energy that is environmentally friendly, one of them is wind energy and solar energy. Hybrid power plants use savonius helix wind turbines and solar cells are made to minimize the use of conventional energy. This tool utilizes wind and solar energy as the main media of electricity generation. The wind turbine which is made is a type of he

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9

Van Den Berg, Daniel, Delphine De Tavernier, Jonas Gutknecht, Axelle Viré, and Jan-Willem Van Wingerden. "The Influence of Floating Turbine Dynamics on the Helix Wake Mixing Method." Journal of Physics: Conference Series 2767, no. 3 (2024): 032012. http://dx.doi.org/10.1088/1742-6596/2767/3/032012.

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Abstract Wake mixing techniques like the Helix have shown to be effective at reducing the wake interaction between turbines, which improves wind farm power production. When these techniques are applied to a floating turbine it will excite movement. The type and magnitude of movement are dependent on floater dynamics. This work investigates four different floating turbines. Of these four turbines, two are optimised variants of the TripleSpar and Softwind platforms with enhanced yaw motion. The other two are the unaltered versions of these platforms. When the Helix is applied to all four floatin

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10

P., Y. Venkata Sai Teja, Tharuni Naga, Murari Patvari, and Neelakanteshwar Rao B. "Study of Stand-alone Wind Energy System." Advancement and Research in Instrumentation Engineering 7, no. 1 (2024): 18–26. https://doi.org/10.5281/zenodo.10617992.

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<em>This work investigates the implementation of Helix wind turbines installed at VNR Vignana Jyothi Institute of Engineering and Technology (VNRVJIET) terrace, focusing on a sustainable energy generation system. The system comprises Axial Flux Generators (AFG) with a PCB- based design, converting mechanical wind energy into efficient electrical power. The research involves a comprehensive analysis of power generation through various wind speeds. The methodology involves theoretical power output calculations using air density considerations, coupled with the turbine's characteristics at differ

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11

Taschner, E., M. Becker, Remco Verzijlbergh, and JW Van Wingerden. "Comparison of helix and wake steering control for varying turbine spacing and wind direction." Journal of Physics: Conference Series 2767, no. 3 (2024): 032023. http://dx.doi.org/10.1088/1742-6596/2767/3/032023.

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Abstract A variety of wind farm control strategies exist in order to reduce unfavorable wake effects in large wind farms. While strategies like wake steering already reached a high maturity level, it is interesting to compare them to more recently proposed strategies. Such a comparison can form the basis for the development of a symbiotic wind farm control toolbox, from which a control strategy is chosen and activated depending on the operating conditions. The present study compares wake steering with helix control across a wide range of turbine spacings and wind directions using large-eddy si

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12

Mizar, Muhammad Alfian, Moch Sholihul Hadi, and Samsul Hidayat. "Implementasi Turbin Angin Tipe Helix Dalam Mendukung Ketersediaan Energi Listrik di Wilayah Wisata Dilem Wilis Trenggalek." Jurnal KARINOV 5, no. 3 (2022): 194. http://dx.doi.org/10.17977/um045v5i3p194-198.

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Energi angin menjadi salah satu energi terbarukan yang tidak terdegradasi, dan tersebar secara geografis. Pemanfaatan energi angin juga di dukung dengan ditargetkannya bauran energi 23% berasal dari EBT pada 2025 mendatang. Kementrian ESDM (Energi dan Sumber Daya Mineral) RI juga mengatakan bahwa potensi angin di Indonesia sangat tinggi mencapai 978 MW yang tersebar di berbagai daerah di Indonesia. Lokasi Pengabdian Masyarakat yaitu Wisata Dilem Wilis Trenggalek memiliki potensi energi angin yang dapat dimanfaatkan untuk menghasilkan listrik, sehingga perlu diimplementasikan turbin angin tipe

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13

Hirschl, Alexander, and Daniel Österreicher. "Evaluation of the Influences of Different Roof Shapes on the Flow Properties and Performance of Small Wind Turbines." Journal of Mechanical Engineering 26, no. 2 (2023): 24–33. http://dx.doi.org/10.15407/pmach2023.02.024.

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Small wind turbines offer a complement to photovoltaic systems and are becoming an interesting solution in the wake of rising energy prices. The measurement results indicate that some locations on and around the building are not suited for installing wind turbines, while others show increased wind potential. Due to limited space, rooftop mounting is an interesting alternative to free mounting on a mast from a technical point of view. For this reason, the influence of roof shapes on the flow on and behind the building was measured and the performance of two different types of small wind turbine

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14

Coquelet, M., J. Gutknecht, JW Van Wingerden, M. Duponcheel, and P. Chatelain. "Dynamic individual pitch control for wake mitigation: Why does the helix handedness in the wake matter?" Journal of Physics: Conference Series 2767, no. 9 (2024): 092084. http://dx.doi.org/10.1088/1742-6596/2767/9/092084.

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Abstract Wind farm flow control aims at mitigating wake effects in order to maximize power production in wind farms. This work mostly focuses on the Helix strategy, which relies on individual pitch control to radially offset the application point of the thrust force from the rotor center and to dynamically change its azimuthal position. Previous studies have shown that power gains for a downstream turbine are higher for a counter-clockwise (CCW) rotation of the application point than for a clockwise (CW) one. In the CCW case, the wake develops as a right-handed helix, while in the CW case, a l

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15

Rochman, Sagita, Krishna Wijayakusuma, and Rivaldo Josua Jetrin Rolos. "DESIGN AND CONSTRUCTION OF VERTICAL HELIX SAVONIUS WIND TURBINE FOR PUBLIC STREET LIGHTING." BEST : Journal of Applied Electrical, Science, & Technology 4, no. 2 (2022): 47–50. http://dx.doi.org/10.36456/best.vol4.no2.6158.

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Wind power generator for lighting public roads in Tambakrejo Village, Sumbermanjing District, Malang Regency in order to minimize the level of traffic accidents. This power plant utilizes wind resources that blow to drive a wind turbine generator that will produce electrical energy. The use of wind to become electrical energy is designed from a vertical helix savonius type wind turbine as a medium for receiving wind gusts that will drive a generator to create electrical energy. The advantage of this helix savonius wind turbine can accommodate all cardinal directions because it has 2 blades tha

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16

Stratila, Sergiu, Dan Glasberg, and Ion Mălăel. "Performance Analysis of a New Vertical Axis Turbine Design for Household Usage." Engineering, Technology & Applied Science Research 14, no. 1 (2024): 12536–42. http://dx.doi.org/10.48084/etasr.6559.

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The popularity of small wind turbines intended for domestic use has significantly increased during the recent years, and it is reasonable to assume that this trend will continue given the present political and economic environment. There is a greater need for clean, pollution-free energy due to worries about climate change. In this study, a 1.5 KW vertical-axis Darrieus helix wind turbine for residential use was designed and its performance was mathematically evaluated under typical wind speed circumstances of 12 m/s. The study is split into two sections: In the first, we examined a standard w

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17

Berg, Daniel van den, Delphine de Tavernier, and Jan-Willem van Wingerden. "Using The Helix Mixing Approach On Floating Offshore Wind Turbines." Journal of Physics: Conference Series 2265, no. 4 (2022): 042011. http://dx.doi.org/10.1088/1742-6596/2265/4/042011.

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Abstract In recent years dynamic induction control has shown great potential in reducing wake-to-turbine interaction by increasing the mixing in the wake. With these wake mixing methods the thrust force will vary in time. If applied to a floating offshore wind turbine, it will cause the platform to move. In this paper the effect of the Helix mixing approach on a DTU10MW turbine on the TripleSpar platform and its wake is evaluated. When the Helix mixing approach is applied at Strouhal equal to 0.25, the yaw movement is excited close to the eigenfrequency of the platform resulting in significant

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18

Deb, Bachu, Rajat Gupta, and R. D. Misra. "Experimental Analysis of a 20° Twist Helical Savonius Rotor at Different Overlap Conditions." Applied Mechanics and Materials 592-594 (July 2014): 1060–64. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1060.

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Wind power is a major source of sustainable energy and can be harvested using both horizontal and vertical axis wind turbines. Vertical axis wind turbines (VAWTs) accrue more popularity due to its self-starting characteristics and Omni directional in nature. Out of which Savonius rotor is the most popular drag-based VAWT which is having lower efficiencies but having good self-starting characteristics. In order to improve the performance, helix in the tip of the blade is targeted which reduces the negative torque coefficient of the rotor thereby could improve the performance of the rotor. There

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van Vondelen, Aemilius A. W., Joris Ottenheym, Atindriyo K. Pamososuryo, Sachin T. Navalkar, and Jan-Willem van Wingerden. "Phase Synchronization for Helix Enhanced Wake Mixing in Downstream Wind Turbines." IFAC-PapersOnLine 56, no. 2 (2023): 8426–31. http://dx.doi.org/10.1016/j.ifacol.2023.10.1039.

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20

Wang, Le, Xing Zhao, Puyang Zhang, et al. "The Study of the Failure Envelopes of Hollow Shaft Single-Plate Helical Piles in Clay." Journal of Marine Science and Engineering 11, no. 7 (2023): 1323. http://dx.doi.org/10.3390/jmse11071323.

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Helical piles are utilized worldwide as foundations for onshore infrastructure, providing fast installation and high capacity. Their unique advantages have led to their potential as an alternative to monopile foundations for offshore wind turbines. One challenge in their service life is dealing with combined loading caused by wind, waves, current, and the weight of the structure itself. While research has focused on helical piles’ capacity for uniaxial tensile loads, there is limited knowledge regarding their performance under combined loads. This study used FEM analysis to investigate the imp

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21

Divakaran, Unnikrishnan, Ajith Ramesh, Akram Mohammad, and Ratna Kishore Velamati. "Effect of Helix Angle on the Performance of Helical Vertical Axis Wind Turbine." Energies 14, no. 2 (2021): 393. http://dx.doi.org/10.3390/en14020393.

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The energy crisis has forced researchers to look for various non-conventional energy sources. Wind energy is one of the potential sources, and researchers have invested resources in developing different kinds of wind turbines. Vertical axis wind turbines (VAWT) have received less attention than their horizontal-axis counterparts. A helical-bladed VAWT is preferred because it makes perfect sense as an improvement in design, as they have higher azimuth angles of power generation capabilities. This paper studies the effects of the helix angle of blades in the aerodynamic performance of VAWT using

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22

Wood, David H. "The second curvature correction for the straight segment approximation of periodic vortex wakes." Wind Energy Science 3, no. 1 (2018): 345–52. http://dx.doi.org/10.5194/wes-3-345-2018.

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Abstract. The periodic, helical vortex wakes of wind turbines, propellers, and helicopters are often approximated using straight vortex segments which cannot reproduce the binormal velocity associated with the local curvature. This leads to the need for the first curvature correction, which is well known and understood. It is less well known that under some circumstances, the binormal velocity determined from straight segments needs a second correction when the periodicity returns the vortex to the proximity of the point at which the velocity is required. This paper analyzes the second correct

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23

WOOD, D. H., and J. BOERSMA. "On the motion of multiple helical vortices." Journal of Fluid Mechanics 447 (October 30, 2001): 149–71. http://dx.doi.org/10.1017/s002211200100578x.

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The analysis of the self-induced velocity of a single helical vortex (Boersma & Wood 1999) is extended to include equally spaced multiple vortices. This arrangement approximates the tip vortices in the far wake of multi-bladed wind turbines, propellers, or rotors in ascending, descending, or hovering flight. The problem is reduced to finding, from the Biot–Savart law, the additional velocity of a helix due to an identical helix displaced azimuthally. The resulting Biot–Savart integral is further reduced to a Mellin–Barnes integral representation which allows the asymptotic expansions to be

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24

Ibrahim, Azhar S., Hassan O. Abbas, and Omar K. Ali. "Experimental Study on Configuration and Spacing of Screw Pile Group Effect Subjected to Lateral Cyclic Loading." E3S Web of Conferences 318 (2021): 01004. http://dx.doi.org/10.1051/e3sconf/202131801004.

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Despite the great development in the manufacture of the helical pile and the development of their use, especially in transmission towers and wind turbines, there is little research on their lateral behavior. In this laboratory study investigate the behavior of screw piles group (2×1) and (1×2) with the spacing to the diameter of helix ratio (S/Dh =1.5, 3, and 4.5) having a diameter (10 mm) and embedded length to diameter ratio (L/D = 40) by using single and double helix embedded in soft clay and extend to stiff clay under a cyclic lateral load of frequency (0.2 Hz). The results showed that inc

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25

Montenegro Montero, M., V. Arcari, S. Cacciola, and A. Croce. "Effectiveness of dynamic induction control strategies on the wake of a wind turbine." Journal of Physics: Conference Series 2265, no. 2 (2022): 022054. http://dx.doi.org/10.1088/1742-6596/2265/2/022054.

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Abstract Dynamic Induction Control (DIC) has been recently proposed as means for enhancing wake recovery and, in turn, for increasing the overall produced power. A faster wake recovery is triggered by a Periodic Collective Motion (PCM), following a single sine function (S-PCM), or by a combination of Gaussian functions (G-PCM). Both techniques are associated with power gains in simple two- or three-turbine farms, but entail an increase in machine loading. A technique named the Helix approach generates a dynamic induction through a thrust that varies in direction but not in magnitude, reducing

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26

Ding, Wang, Zhang, Liang, Tian, and Qi. "The Recycling Torque of a Single-Plate Helical Pile for Offshore Wind Turbines in Dense Sand." Applied Sciences 9, no. 19 (2019): 4105. http://dx.doi.org/10.3390/app9194105.

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The helical piles have been being treated as a kind of novel foundation for offshore wind turbines recently, due their fast installation, high uplift capacity, convenience for recycling, and other advantages. The recycling of the helical pile especially will reduce the cost significantly and protect the environment as much as possible. However, the research for this area is basically in infancy and there is no reference for predicting the recycling torque of a helical pile in sand. In order to predict the recycling torque of single-plate helical piles in dense sand: a theoretical model, which

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27

Muscari, C., P. Schito, A. Viré, A. Zasso, D. van der Hoek, and JW van Wingerden. "Physics informed DMD for periodic Dynamic Induction Control of Wind Farms." Journal of Physics: Conference Series 2265, no. 2 (2022): 022057. http://dx.doi.org/10.1088/1742-6596/2265/2/022057.

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Abstract Dynamic Induction Control (DIC) is a novel, exciting branch of Wind Farm Control. It makes use of time-varying control inputs to increase wake mixing, and consequently improve the velocity recovery rate of the flow and the power production of downstream turbines. The Pulse and the Helix are two promising DIC strategies that rely on sinusoidal excitations of the collective pitch and individual pitch of the blades, respectively. While their beneficial effects are evident in simulations and wind tunnel tests, we do not yet fully understand the physics behind them. We perform a systematic

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28

Saur, Lukas, Jörg Riedel, Storm Dunker, and Stefan Becker. "Experimental investigation of flow-induced sound of kite lines." Acta Acustica 7 (2023): 35. http://dx.doi.org/10.1051/aacus/2023027.

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In times of increasing importance of renewable energies, airborne wind energy (AWE) systems represent an emerging extension to conventional wind turbines. Many AWE systems use powerful kites to provide tether traction to mechanically unwind the tether, generating electricity on the ground. In addition to the traction tether, a large number of kite lines spanning the kite are moved through the air at high speed. This can produce a loud unpleasant whistling noise on the ground, which is due to a superposition of the aeolian tones of the many different lines. In the present work, differently stru

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Witono, Kris, Moh Nasir, Elka Faizal, Hangga Wicaksono, and Bayu Pranoto. "Pengaruh Model Sudu Overlap dan Helix pada Proses Inisiasi Putaran Turbin Savonius." Otopro 15, no. 1 (2019): 27. http://dx.doi.org/10.26740/otopro.v15n1.p27-31.

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This research proposes a new model of overlap and helix blade shape. The overlap shape of the blades gives room to the air flow shortly after pounding the blades. Air flow direction is strived to be able to push the next blade so that the process of the turbine blade rotation becomes more effective. While the helix model is expected to produce a more efficient turbine rotation due to its multilevel shape. The wind speeds tested were 2 m / s, 4 m / s, and 6 m / s. Turbine speed rotation data retrieval is carried out at each additional time. The overlap blade has a greater angular velocity value

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NISHIZAWA, Yoshifumi, Yasuyuki NEMOTO, Yukihiro MAEZAWA, and Izumi USHIYAMA. "A Study on Helix-Darrieus Type Wind Turbine." Proceedings of the JSME annual meeting 2003.2 (2003): 59–60. http://dx.doi.org/10.1299/jsmemecjo.2003.2.0_59.

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Yudha Santika, Wisnu, Hadi Saputra, and Toto Rusianto. "Desain Dan Simulasi Turbin Angin Savonius Dengan Konfigurasi Rotor Tipe L Dan Tipe Helix Sebagai Sumber Listrik Lampu PJU Pelabuhan Perikanan Cikidang Pangandaran Jawa Barat." Jurnal Teknologi 15, no. 2 (2022): 96–103. http://dx.doi.org/10.34151/jurtek.v15i2.3150.

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Cikidang Fishing Port, Pangandaran, West Java is located in the southern region of Java island which is directly opposite the Indian Ocean which has the potential for energy development, one of which is from wind. Wind is one of the natural resources that can be used as an alternative power generation source as a substitute for conventional fuel. From the results of observations on the average wind speed for seven days of v = 4.8 m/s. Based on the results of observations, a vertical axis wind turbine, namely Savonius, is planned as the drive of the power plant generator, with configurations in

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Li, Zheng, Tianhe Zhang, Yang Chen, and Lijuan Song. "The Effect of Parallel-Axis Helix Gear Pair on Wind Turbine Gearbox Vibration Control." Shock and Vibration 2020 (August 14, 2020): 1–13. http://dx.doi.org/10.1155/2020/8893890.

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This article studies the effects of some basic parameters of a parallel-axis helix gear stage on wind turbine gearbox vibration in a case study: a multibody dynamic model is constructed to simulate the drive train of a faulted multistage wind turbine gearbox with serious vibrations. The significant vibration behaviour of the drive train for typical excitations is calculated, and the results according to specified geometric parameters of the gears are analysed in detail to investigate effective solutions for vibration reduction. The results indicate that the helix angle and numbers of teeth of

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Park, Young-Jun, Geun-Ho Lee, Jin-Seop Song, Yong-Yun Nam, and Ju-Seok Nam. "Optimal Design of Wind Turbine Gearbox using Helix Modification." Engineering in Agriculture, Environment and Food 6, no. 4 (2013): 147–51. http://dx.doi.org/10.1016/s1881-8366(13)80001-8.

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34

Iungo, G. V., F. Viola, S. Camarri, F. Porté-Agel, and F. Gallaire. "Linear stability analysis of wind turbine wakes performed on wind tunnel measurements." Journal of Fluid Mechanics 737 (November 27, 2013): 499–526. http://dx.doi.org/10.1017/jfm.2013.569.

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AbstractWind tunnel measurements were performed for the wake produced by a three-bladed wind turbine immersed in uniform flow. These tests show the presence of a vorticity structure in the near-wake region mainly oriented along the streamwise direction, which is denoted as the hub vortex. The hub vortex is characterized by oscillations with frequencies lower than that connected to the rotational velocity of the rotor, which previous works have ascribed to wake meandering. This phenomenon consists of transversal oscillations of the wind turbine wake, which might be excited by the vortex sheddin

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Cheung, Lawrence C., Kenneth A. Brown, Daniel R. Houck, and Nathaniel B. deVelder. "Fluid-Dynamic Mechanisms Underlying Wind Turbine Wake Control with Strouhal-Timed Actuation." Energies 17, no. 4 (2024): 865. http://dx.doi.org/10.3390/en17040865.

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A reduction in wake effects in large wind farms through wake-aware control has considerable potential to improve farm efficiency. This work examines the success of several emerging, empirically derived control methods that modify wind turbine wakes (i.e., the pulse method, helix method, and related methods) based on Strouhal numbers on the O(0.3). Drawing on previous work in the literature for jet and bluff-body flows, the analyses leverage the normal-mode representation of wake instabilities to characterize the large-scale wake meandering observed in actuated wakes. Idealized large-eddy simul

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Finali, Asmar, Prabuditya Bhisma Wisnu Wardhana, Rochmad Eko Prasetyaning Utomo, and I. Gusti Ngurah Agung Satria Prasetya Dharma Yudha. "Balancing and Alignment Analysis of Vertical Wind Turbine Helix Type and Savonius Type." TRANSMISI 19, no. 2 (2023): 63–70. http://dx.doi.org/10.26905/jtmt.v19i2.9654.

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Electrical energy is one of the basic needs that is very important in life, in addition to the physiological development of living things, electricity is also an input for various efforts or activities in order to produce something for survival. Therefore, renewable energy that is more environmentally friendly and an inexhaustible source of energy is needed, namely wind energy. This power generator is called a wind turbine with a vertical shaft. This turbine converts wind energy into mechanical and electrical. In order to obtain a turbine design with high efficiency. It is also necessary to ba

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Liang, Dong, Bingkui Chen, and Yane Gao. "Hobbing Manufacturing of New Type of Involute-Helix Gears for Wind Turbine Gearbox." International Journal of Precision Engineering and Manufacturing-Green Technology 6, no. 2 (2019): 305–13. http://dx.doi.org/10.1007/s40684-019-00087-4.

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Sarmast, Sasan, Reza Dadfar, Robert F. Mikkelsen, et al. "Mutual inductance instability of the tip vortices behind a wind turbine." Journal of Fluid Mechanics 755 (August 26, 2014): 705–31. http://dx.doi.org/10.1017/jfm.2014.326.

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AbstractTwo modal decomposition techniques are employed to analyse the stability of wind turbine wakes. A numerical study on a single wind turbine wake is carried out focusing on the instability onset of the trailing tip vortices shed from the turbine blades. The numerical model is based on large-eddy simulations (LES) of the Navier–Stokes equations using the actuator line (ACL) method to simulate the wake behind the Tjæreborg wind turbine. The wake is perturbed by low-amplitude excitation sources located in the neighbourhood of the tip spirals. The amplification of the waves travelling along

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Hagemann, Thomas, Huanhuan Ding, Esther Radtke, and Hubert Schwarze. "Operating Behavior of Sliding Planet Gear Bearings for Wind Turbine Gearbox Applications—Part I: Basic Relations." Lubricants 9, no. 10 (2021): 97. http://dx.doi.org/10.3390/lubricants9100097.

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The application of sliding planet gear bearings in wind turbine gearboxes has become more common in recent years. Assuming practically applied helix angles, the gear mesh of the planet stage causes high force and moment loads for these bearings involving high local loads at the bearing edges. Specific operating behavior and suitable design measures to cope with these challenging conditions are studied in detail based on a thermo-hydrodynamic (THD) bearing model. Radial clearance and axial crowning are identified as important design parameters to reduce maximum pressures occurring at the bearin

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Ahmed, Bassam Ali. "Identifying the influence of dimensional parameters on the stresses and deformations of two helical gears." Eastern-European Journal of Enterprise Technologies 5, no. 7 (119) (2022): 76–83. http://dx.doi.org/10.15587/1729-4061.2022.266261.

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In this research paper, focusing on the basic variables of the gear modeling process and setting its dimensions to see which gears are capable of withstanding transmission operations and its rigidity was done. Because one of the most prominent transmission mechanics is gears, as the types of gears are numerous and common, and one of the most prominent types of gears is the helical gear. The helical gear is one of the most widely used and widespread gears in mechanical fields due to the increase in the contact area during the interlock process, as this increase reduces noise during gear rotatio

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Bassam, Ali Ahmed. "Identifying the influence of dimensional parameters on the stresses and deformations of two helical gears." Eastern-European Journal of Enterprise Technologies 5, no. 7(119) (2022): 76–83. https://doi.org/10.15587/1729-4061.2022.266261.

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In this research paper, focusing on the basic variables of the gear modeling process and setting its dimensions to see which gears are capable of withstanding transmission operations and its rigidity was done. Because one of the most prominent transmission mechanics is gears, as the types of gears are numerous and common, and one of the most prominent types of gears is the helical gear. The helical gear is one of the most widely used and widespread gears in mechanical fields due to the increase in the contact area during the interlock process, as this increase reduces noise during gear rotatio

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van den Berg, Daniel, Delphine de Tavernier, David Marten, Joseph Saverin, and Jan-Willem van Wingerden. "Wake Mixing Control For Floating Wind Farms: Analysis of the Implementation of the Helix Wake Mixing Strategy on the IEA 15-MW Floating Wind Turbine." IEEE Control Systems 44, no. 5 (2024): 81–105. http://dx.doi.org/10.1109/mcs.2024.3432341.

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Moradi Ghareghani, Mohammad Sadegh, Abolfazl Abdolahifar, and S. M. H. Karimian. "Numerical investigation on the helix angle to smoothen aerodynamic torque output of the 3-PB Darrieus vertical axis wind turbine." Journal of Wind Engineering and Industrial Aerodynamics 234 (March 2023): 105323. http://dx.doi.org/10.1016/j.jweia.2023.105323.

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Li, Haiyu, and Heungjin Chung. "Prediction of Member Forces of Steel Tubes on the Basis of a Sensor System with the Use of AI." Sensors 25, no. 3 (2025): 919. https://doi.org/10.3390/s25030919.

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The rapid development of AI (artificial intelligence), sensor technology, high-speed Internet, and cloud computing has demonstrated the potential of data-driven approaches in structural health monitoring (SHM) within the field of structural engineering. Algorithms based on machine learning (ML) models are capable of discerning intricate structural behavioral patterns from real-time data gathered by sensors, thereby offering solutions to engineering quandaries in structural mechanics and SHM. This study presents an innovative approach based on AI and a fiber-reinforced polymer (FRP) double-heli

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Prabowo, Handy, Danar Susilo Wijayanto, Taufik Wisnu Saputra, and Mohd Shafie Bin Bakar. "The Optimization of Savonius Helix Wind Turbine Cut-in Speed with the Variation of Blades-twist Rotor and Number of Blades." JIPTEK 16, no. 2 (2023): 81. http://dx.doi.org/10.20961/jiptek.v16i2.71389.

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Korb, H., H. Asmuth, and S. Ivanell. "The characteristics of helically deflected wind turbine wakes." Journal of Fluid Mechanics 965 (June 9, 2023). http://dx.doi.org/10.1017/jfm.2023.390.

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The helix approach is a new individual pitch control method to mitigate wake effects of wind turbines. Its name is derived from the helical shape of the wake caused by a rotating radial force exerted by the turbine. While its potential to increase power production has been shown in previous studies, the physics of the helical wake are not well understood to date. Open questions include whether the increased momentum in the wake stems from an enhanced wake mixing or from the wake deflection. Furthermore, its application to a row of more than two turbines has not been examined before. We study t

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van der Hoek, Daan, Bert Van den Abbeele, Carlos Simao Ferreira, and Jan‐Willem van Wingerden. "Maximizing wind farm power output with the helix approach: Experimental validation and wake analysis using tomographic particle image velocimetry." Wind Energy, February 8, 2024. http://dx.doi.org/10.1002/we.2896.

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AbstractWind farm control can play a key role in reducing the negative impact of wakes on wind turbine power production. The helix approach is a recent innovation in the field of wind farm control, which employs individual blade pitch control to induce a helical velocity profile in a wind turbine wake. This forced meandering of the wake has turned out to be very effective for the recovery of the wake, increasing the power output of downstream turbines by a significant amount. This paper presents a wind tunnel study with two scaled wind turbine models of which the upstream turbine is operated w

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Gutknecht, J., E. Taschner, M. Coquelet, A. Viré, and J. W. van Wingerden. "The impact of coherent large-scale vortices generated by helix active wake control on the recovery process of wind turbine wakes." Physics of Fluids 37, no. 6 (2025). https://doi.org/10.1063/5.0278687.

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Within a wind farm, each wind turbine extracts kinetic energy from the flow to convert it into electric energy. Unavoidably, this reduces the downstream availability of kinetic energy, diminishing the power generation of turbines operating in the waked region. These wake-induced power losses cumulate throughout the wind farm, posing a risk to its economic feasibility. One method that mitigates these power losses is helix active wake control. By leveraging individual blade pitch control, it induces an uneven thrust distribution over the rotor plane, which rotates either in clockwise (CW) or cou

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Marten, David, Matthew Lennie, George Pechlivanoglou, et al. "Benchmark of a Novel Aero-Elastic Simulation Code for Small Scale VAWT Analysis." Journal of Engineering for Gas Turbines and Power 141, no. 4 (2018). http://dx.doi.org/10.1115/1.4041519.

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After almost 20 years of absence from research agendas, interest in the vertical axis wind turbine (VAWT) technology is presently increasing again, after the research stalled in the mid 90's in favor of horizontal axis wind turbines (HAWTs). However, due to the lack of research in past years, there are a significantly lower number of design and certification tools available, many of which are underdeveloped if compared to the corresponding tools for HAWTs. To partially fulfill this gap, a structural finite element analysis (FEA) model, based on the Open Source multiphysics library PROJECT::CHR

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Komori, Masaharu, Fumi Takeoka, Aizoh Kubo, et al. "Artifact Design and Measurement Error Analysis in the Evaluation of Lead Measurement Accuracy of Helical Gear Using Wedge Artifact." Journal of Mechanical Design 132, no. 7 (2010). http://dx.doi.org/10.1115/1.4001668.

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The reduction in the vibration and noise of gears is an important issue in mechanical devices such as vehicles and wind turbines. The characteristics of the vibration and noise of gears are markedly affected by deviations of the tooth flank form of micrometer order; therefore, strict quality control of the tooth flank form is required. The accuracy of the lead measurement for a gear-measuring instrument is usually evaluated using a helicoid artifact. However, it is difficult to manufacture it with high accuracy because the helix is a complicated geometrical form. To solve this problem, a metho

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