Marine Renewable Energy, 2nd Volume

Abstract submission deadline

30 August 2024

Manuscript submission deadline

30 November 2024

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Topic Information

Dear Colleagues,

We would like to invite submissions to this Topic on the subject of Marine Renewable Energy, which is a continuation of a successful previous Topic.

Marine Renewable Energy (MRE) is abundant, and there are large spaces in both offshore and coastal environments that can be considered for harvesting various kinds of marine energy. The effects of climate change have become obvious, and a drastic reduction in CO2 emissions represents an issue of highly increasing importance. From this perspective, the technologies currently associated with marine renewable energy extraction are very significant for achieving the expected targets in energy efficiency and environmental protection. Research into offshore wind has experienced significant success in the last decade and is expected to advance other MRE sources. On the other hand, although significant advances have been noticed in recent years, with regard to extracting marine renewable energy, there are still important challenges related to the implementation of cost-effective technologies that could survive in the harsh marine environment. From this perspective, this Topic seeks to contribute to the renewable energy agenda through enhanced scientific and multidisciplinary works, aiming to improve knowledge and performance in harvesting ocean energy. We strongly encourage papers providing innovative technical developments, reviews, case studies, and analytics, as well as assessments and manuscripts targeting different disciplines, which are relevant to harvesting ocean energy and to the associated advances and challenges.

Prof. Dr. Eugen Rusu
Prof. Dr. Kostas Belibassakis
Dr. George Lavidas
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Energies energies	3.2	5.5	2008	16.1 Days	CHF 2600	Submit
Journal of Marine Science and Engineering jmse	2.9	3.7	2013	15.4 Days	CHF 2600	Submit
Processes processes	3.5	4.7	2013	13.7 Days	CHF 2400	Submit
Inventions inventions	3.4	5.4	2016	17.4 Days	CHF 1800	Submit

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Published Papers (7 papers)

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All Energies JMSE Processes Inventions

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16 pages, 3394 KiB  

Open AccessArticle

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

by Mingmin Chen, Xinbo Huang, Zhaokun Wang, Hongtao Zheng and Fuquan Deng

J. Mar. Sci. Eng. 2024, 12(4), 621; https://doi.org/10.3390/jmse12040621 - 04 Apr 2024

Viewed by 422

Abstract

In this study, large eddy simulation (LES) was used to investigate the dynamic characteristics of diffusion flames in a swirl combustion chamber at an oxygen content of 11–23 wt% and temperature of 770 K. The proper orthogonal decomposition (POD) method was employed to [...] Read more.

In this study, large eddy simulation (LES) was used to investigate the dynamic characteristics of diffusion flames in a swirl combustion chamber at an oxygen content of 11–23 wt% and temperature of 770 K. The proper orthogonal decomposition (POD) method was employed to obtain flame dynamic modes. The results indicate that oxygen content has a significant impact on the downstream flow and flame combustion characteristics of the swirl combustion chamber. With oxygen content increasing, the size of the recirculation zone is reduced, and the flame field fluctuations are intensified. The pressure and heat release fluctuations under different oxygen contents were analyzed using frequency spectrum analysis. Finally, the flame modes were analyzed using the POD method, and it was found that the coherent structures are asymmetric relative to the local coordinate system. At an oxygen content of 11 wt%, they exhibit larger coherent structures, while at an oxygen content of 23 wt%, they exhibit numerous turbulent structures. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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18 pages, 9752 KiB  

Open AccessArticle

A Composite Super-Twisting Sliding Mode Approach for Platform Motion Suppression and Power Regulation of Floating Offshore Wind Turbine

by Wenxiang Yang, Yaozhen Han, Ronglin Ma, Mingdong Hou and Guang Yang

J. Mar. Sci. Eng. 2023, 11(12), 2318; https://doi.org/10.3390/jmse11122318 - 07 Dec 2023

Cited by 1 | Viewed by 728

Abstract

The floating platform motion of an offshore wind turbine system can exacerbate output power fluctuations and increase fatigue loads. This paper proposes a new scheme based on a fast second-order sliding mode (SOSM) control and an adaptive super-twisting extended state observer to suppress [...] Read more.

The floating platform motion of an offshore wind turbine system can exacerbate output power fluctuations and increase fatigue loads. This paper proposes a new scheme based on a fast second-order sliding mode (SOSM) control and an adaptive super-twisting extended state observer to suppress the platform motion and power fluctuation. Firstly, an affine nonlinear model of the floating wind turbine pitch system is constructed. Then, a fast SOSM pitch control law is adopted to adjust the blade pitch angle, and a new adaptive super-twisting extended state observer is constructed to achieve total disturbance observation. Finally, simulations are conducted under two cases of wind and wave conditions based on FAST (fatigue, aerodynamics, structures, and turbulence) and MATLAB/Simulink. Compared with the traditional proportional integral (PI) control scheme and standard super-twisting control scheme, the platform roll under the proposed scheme is reduced by 13% and 4%, and pitch is reduced by 16% and 3% in Case 1. Correspondingly, the roll is reduced by 9% and 15%, and pitch is reduced by 7% and 1% in Case 2. For the tower top pitch and yaw moment, load reductions of 7% and 3% or more are achievable compared with those under the PI control scheme. It is indicated that the proposed scheme is more effective in suppressing floating platform motion, stabilizing output power of the wind turbine system, and reducing tower loads. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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14 pages, 4248 KiB  

Open AccessArticle

Test and Analysis of the Heat Exchanger for Small Ocean Thermal Energy Power Generation Devices

by Xiao Wu, Xiangnan Wang and Bingzhen Wang

Energies 2023, 16(22), 7559; https://doi.org/10.3390/en16227559 - 13 Nov 2023

Viewed by 556

Abstract

The application of ocean thermal energy conversion is an effective method to extend underwater vehicles’ running times and operating ranges, and the solid–liquid phase transition of the phase change material (PCM) in the heat exchanger is a key process for underwater vehicles to [...] Read more.

The application of ocean thermal energy conversion is an effective method to extend underwater vehicles’ running times and operating ranges, and the solid–liquid phase transition of the phase change material (PCM) in the heat exchanger is a key process for underwater vehicles to collect ocean thermal energy. This study proposes a heat exchanger structure for a small-size thermal energy power generation device and establishes the heat transfer model for the heat exchanger. Simulations were conducted considering convective heat transfer, and the obtained results demonstrated the feasibility of the designed structure. A prototype of the heat exchanger was developed, and physical experiments were conducted to validate the performance of the prototype. The results show that the melting process of the heat exchanger can be completed within 6 to 12 h, the solidification process can be completed within 3 to 7 h, and the heat transfer time decreases with the increase in temperature difference, verifying the compatibility with the underwater vehicles’ working patterns. Moreover, the heat exchanger could theoretically extend their lifetime. The results can provide a reference for the structural design and optimization of the heat exchanger for small ocean thermal energy power generation devices in the future. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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17 pages, 3846 KiB  

Open AccessArticle

Optimal Design and Performance Analysis of a Hybrid System Combining a Semi-Submersible Wind Platform and Point Absorbers

by Binzhen Zhou, Jianjian Hu, Qi Zhang, Lei Wang, Fengmei Jing and Maurizio Collu

J. Mar. Sci. Eng. 2023, 11(6), 1190; https://doi.org/10.3390/jmse11061190 - 08 Jun 2023

Cited by 1 | Viewed by 1102

Abstract

Integrating point absorber wave energy converters (PAWECs) and an offshore floating wind platform provide a cost-effective way of joint wind and wave energy exploitation. However, the coupled dynamics of the complicated hybrid system and its influence on power performance are not well understood. [...] Read more.

Integrating point absorber wave energy converters (PAWECs) and an offshore floating wind platform provide a cost-effective way of joint wind and wave energy exploitation. However, the coupled dynamics of the complicated hybrid system and its influence on power performance are not well understood. Here, a frequency-domain-coupled hydrodynamics, considering the constraints and the power output through the relative motion between the PAWECs and the semi-submersible platform, is introduced to optimize the size, power take-off damping, and layout of the PAWECs. Results show that the annual wave power generation of a PAWEC can be improved by 30% using a 90° conical or a hemispherical bottom instead of a flat bottom. Additionally, while letting the PAWECs protrude out the sides of the triangular frame of the platform by a distance of 1.5 times the PAWEC radius, the total power generation can be improved by up to 18.2% without increasing the motion response of the platform. The PAWECs can reduce the resonant heave motion of the platform due to the power take-off damping force. This study provides a reference for the synergistic use of wave and wind energy. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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20 pages, 23210 KiB  

Open AccessArticle

Experimental Investigation of Flow-Induced Motion and Energy Conversion for Two Rigidly Coupled Triangular Prisms Arranged in Tandem

by Jijian Lian, Zhichuan Wu, Shuai Yao, Xiang Yan, Xiaoqun Wang, Zhaolin Jia, Yan Long, Nan Shao, Defeng Yang and Xinyi Li

Energies 2022, 15(21), 8190; https://doi.org/10.3390/en15218190 - 02 Nov 2022

Cited by 1 | Viewed by 1221

Abstract

A series of experimental tests on flow-induced motion (FIM) and energy conversion of two rigidly coupled triangular prisms (TRCTP) in tandem arrangement were conducted in a recirculating water channel with the constant oscillation mass m_osc. The incoming flow velocity covered the [...] Read more.

A series of experimental tests on flow-induced motion (FIM) and energy conversion of two rigidly coupled triangular prisms (TRCTP) in tandem arrangement were conducted in a recirculating water channel with the constant oscillation mass m_osc. The incoming flow velocity covered the range of 0.395 m/s ≤ U ≤ 1.438 m/s, corresponding to the Reynolds number range of 3.45 × 10⁴ ≤ Re ≤ 1.25 × 10⁵. The upstream and downstream triangular prisms with a width of 0.1 m and length of 0.9 m were connected by two rectangular endplates. Seven stiffness (1000 N/m ≤ K ≤ 2400 N/m), five load resistances (8 Ω ≤ R_L ≤ 23 Ω), and five gap ratios (1 ≤ L/D ≤ 4) were selected as the parameters, and the FIM responses and energy conversion of TRCTP in tandem were analyzed and discussed to illustrate the effects. The experimental results indicate that the “sharp jump” phenomenon may appear at L/D = 2 and L/D = 3 significantly, with substantially increasing amplitude and decreasing oscillation frequency. The maximum amplitude ratio in the experiments is A*_Max = 2.24, which appears after the “sharp jump” phenomenon at L/D = 3. In the present tests, the optimal active power P_harn = 21.04 W appears at L/D = 4 (U_r = 12.25, K = 2000 N/m, R_L = 8 Ω), corresponding to the energy conversion efficiency η_harn = 4.67%. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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20 pages, 4892 KiB  

Open AccessArticle

Experimental Proof-of-Concept of a Hybrid Wave Energy Converter Based on Oscillating Water Column and Overtopping Mechanisms

by Irene Simonetti, Andrea Esposito and Lorenzo Cappietti

Energies 2022, 15(21), 8065; https://doi.org/10.3390/en15218065 - 30 Oct 2022

Cited by 5 | Viewed by 1900

Abstract

This paper presents the results of laboratory tests on a hybrid wave energy converter concept, the O²WC (Oscillating-Overtopping Water Column) device. The proposed device aims at providing an alternative to the classical OWC concept, storing part of the wave energy of [...] Read more.

This paper presents the results of laboratory tests on a hybrid wave energy converter concept, the O²WC (Oscillating-Overtopping Water Column) device. The proposed device aims at providing an alternative to the classical OWC concept, storing part of the wave energy of the highly energetic sea states in a second chamber at atmospheric pressure, through overtopping phenomena. In this way, the maximum airflow rate and air pressure in the OWC chamber are reduced, possibly aiding the safe functioning of the air turbine, and allowing to exploit the excess of energy instead of dissipating it through by-pass valves. The performance of the device is investigated under different incident wave conditions, for different design parameters. The height of the overtopping threshold from the second chamber of the device which allows to maximize the performance has been selected. Results show that the decrease of the primary conversion efficiency of the OWC component of the device caused by the decreased air pressure in the OWC chamber can be partially compensated by the additional energy stored in the overtopping chamber of the O²WC device. Overall, the studied O²WC device has capture width ratio values ranging between 0.3 and 0.7. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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20 pages, 11112 KiB  

Open AccessArticle

A Numerical Performance Analysis of a Rim-Driven Turbine in Real Flow Conditions

by Ke Song and Yuchi Kang

J. Mar. Sci. Eng. 2022, 10(9), 1185; https://doi.org/10.3390/jmse10091185 - 25 Aug 2022

Cited by 3 | Viewed by 1715

Abstract

The tidal turbines represent a new frontier for extracting energy from tides source. Despite the technology being mature, new solutions aimed at improving performance, reliability with reduced environmental impact, manufacturing and installation costs are currently under investigation. The Rim-driven turbine (abbreviated as RDT) [...] Read more.

The tidal turbines represent a new frontier for extracting energy from tides source. Despite the technology being mature, new solutions aimed at improving performance, reliability with reduced environmental impact, manufacturing and installation costs are currently under investigation. The Rim-driven turbine (abbreviated as RDT) was recently proposed. A RDT resembles a ducted turbine (abbreviated as DT), as both contain blades and a duct. The present study aims at investigating the detail performance and flow field of a RDT in a real flow based on the China Zhaitang Island’s tidal current data. To show the difference between the RDT and DT, simulations are also performed on the corresponding DT. It is found that the power and thrust for the two configurations exhibit time-periodic behavior that is consistent with the wave frequency. At axial flow, the fluctuation amplitude on the power and thrust increase with the increase of tip speed ratio. The RDT has higher power output when operating at lower tip speed ratio and has a potential reduction in flow resistance and disturbance with respect to the DT. At yawed flow, the fluctuation amplitude on the power and thrust decrease with the increase of yaw angle. The RDT has less capable of compensating the effect of yawed inflow in reducing the power than the DT at larger yaw angle. In addition, the power and thrust generates micro-amplitude fluctuation integrated into the main waveform, which the frequency is consistent with the turbine rotation frequency. The wake characteristics analysis reveals that the yawed flow field is more turbulent, and the two configurations suffer strong unsteady flow separation along the whole span. Strong interactions are observed between the rotor’s main wake and the duct’s upper wake. The yaw angle primarily determines the downstream wake deflection direction and significantly changes the wake shape and vortex structures. Meanwhile, the wake flow is found to recover more quickly at larger yaw angle. Besides, due to the open-center of RDT, a part free-stream flow is allowed to travel through and forms an obvious high velocity zone. The presence of open-center of RDT has avoided the low velocity zone, improved the wake structure and accelerated wakes recover, which seems to give an advantageous effect in operating a RDT. Full article

(This article belongs to the Topic Marine Renewable Energy, 2nd Volume)

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