Evaluating energy loss with the entropy production theory: A case study of a micro horizontal axis river ducted turbine

Wang, Xiu; Yan, Yan; Wang, Wenquan; Hu, Zhou-Ping

doi:10.1016/j.enconman.2022.116553

Cited by 21 publications

(8 citation statements)

References 41 publications

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“…In order to improve the efficiency of hydrokinetic turbines under yaw conditions, a thorough evaluation of the shell design to be used on hydrokinetic turbines is necessary. This evaluation should consider factors such as water flow velocity, turbine size, and the yaw angle faced by the hydrokinetic turbine [11]. Therefore, the use of a shell on hydrokinetic turbines is expected to enhance the efficiency and performance of hydrokinetic turbines under different operating conditions.…”

Section: N V O T E Kmentioning

confidence: 99%

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Leni,

Aprilman

et al. 2023

INVOTEK

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This research aims to analyze the performance of hydrokinetic turbines under yaw misalignment conditions using descriptive statistical methods on coefficient of power (Cp) data. Tests were conducted at water velocities of 0.7, 0.9, and 1.1 m/s for three types of turbine shrouds consisting of turbines without shrouds, turbines with two different types of shrouds, at yaw angles from 0° to 25° with 5° intervals. The study concludes that the performance of each turbine type is significantly influenced by the combination of water flow velocity and yaw angle. The diffuser type has the highest Cp value at every yaw angle, but its performance decreases with increasing yaw angle. The Blade type has poorer performance compared to the diffuser at every yaw angle and has the best performance at a combination of 1.1 m/s velocity and 5° yaw angle. Meanwhile, the shroud type has more stable performance and is not greatly affected by variations in velocity and yaw angle. Based on the analysis of changes in average Cp values with changes in yaw angle at V 0.7 m/s, all three turbine types experienced an increase in Cp value at a yaw angle of 5, with the shroud experiencing the most significant increase. At V 0.9 m/s, the diffuser and shroud types were able to maintain their average Cp values at every yaw angle, while the blade type decreased with increasing yaw angle and experienced a significant decrease at a yaw angle of 25. At V 1.1 m/s, the diffuser and blade types experienced a decrease in performance with every increase in yaw angle, but the shroud type was able to maintain the same Cp value and even experienced a significant increase at a yaw angle of 5.

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Section: N V O T E Kmentioning

confidence: 99%

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Leni,

Aprilman

et al. 2023

INVOTEK

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“…Dalam rangka meningkatkan efisiensi turbin hidrokinetik pada kondisi yaw, perlu dilakukan evaluasi yang mendalam terhadap selubung diffuser yang digunakan pada turbin hidrokinetik. Evaluasi tersebut harus memperhatikan faktor-faktor seperti kecepatan aliran air, ukuran turbin, dan sudut yaw yang dihadapi oleh turbin hidrokinetik [12,15]. Dengan demikian, penggunaan selubung pada turbin hidrokinetik diharapkan dapat meningkatkan efisiensi dan kinerja turbin hidrokinetik pada kondisi operasi yang berbeda.…”

Section: Pendahuluanunclassified

Analisis Kinerja Turbin Hidrokinetik Dengan Selubung Diffuser Pada Kondisi Yaw Misalignment Berdasarkan Variasi Kecepatan Aliran Air

2023

RMME

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Yaw Misalignment condition has detrimental effects on the performance and efficiency of hydrokinetic turbines. This phenomenon occurs when the direction of water flow hitting the turbine blades is not aligned with the turbine's movement direction. In this research, an analysis is conducted on the performance of a hydrokinetic turbine equipped with a diffuser shroud under Yaw Misalignment conditions, considering variations in water flow velocity. The dataset used in this study consists of water flow velocity data, yaw angles, tip speed ratio (TSR), and power coefficient (Cp) of a 19.8 cm diameter horizontal-axis hydrokinetic turbine operating under Yaw Misalignment conditions. Experiments were conducted at three water flow velocity levels: 0.7 m/s, 0.9 m/s, and 1.1 m/s. Additionally, yaw angle variations were applied ranging from 0° to 25° at 5° intervals. Data analysis involved the application of Pearson correlation analysis and descriptive statistical analysis to identify the maximum Cp values. The analysis results indicate that the highest maximum Cp value is 0.711, with a tip speed ratio (TSR) of 4.33, achieved at a yaw angle of 0° and a water flow velocity of 0.9 m/s. This indicates that under these conditions, the turbine reaches its peak performance in converting water flow energy into mechanical power.

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“…VAHKTs, in this case, shown in Figure 1, represent a transformative technology with the potential to revolutionize the renewable energy landscape [10][11][12]. Unlike their horizontal axis counterparts, VAHKTs [13][14][15] possess inherent design advantages, including omnidirectional rotor orientation and enhanced adaptability to varying water flow conditions. However, successfully deploying and optimizing VAHKTs necessitate a deep understanding of the complex fluid dynamics [16,17] that govern their operation.…”

Section: Introductionmentioning

confidence: 99%

Systematic Review of Computational Fluid Dynamics Modelling and Simulation Techniques Employed in Vertical Axis Hydrokinetic Turbines

Muhyiddin Mohammed,

Shamsul Sarip,

Sa’ardin Abdul Aziz

et al. 2024

ARAM

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At present, Computational Fluid Dynamics (CFD) is being utilized to explore tidal and hydrokinetic turbine systems, advancing comprehension of turbulent flow phenomena and raising the accuracy of performance predictions for these fluid-driven turbines. Consequently, this utilization of CFD contributes to the optimization of efficiency in these devices. Turbines are subject to variations from the best design point due to the influence of fluctuating flow rates, despite the findings of recent research that have identified the ideal design points. In contrast to conventional literature reviews, systematic analysis offers numerous advantages. The methodological strategy applied in this study entailed cross-referencing the findings obtained from Web of Science (WOS) and Scopus databases to establish the comprehensiveness as well as reliability of researcher data. Improving the review process, elevating the prominence of the field of study, and establishing critical priorities to mitigate research bias are all potential strategies for enhancing the quality of these evaluations. This research divides its findings into three core themes: (1) Performance assessment for practical implications, (2) Numerical analysis for theoretical insights, and (3) Design parameter optimization for engineering relevance. These themes collectively provide a well-rounded examination of the research outcomes across practical, theoretical, and engineering dimensions. Finally, the research findings have the potential to act as a significant point of reference for informing the best design considerations pertaining to vertical axis turbines.

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Evaluating energy loss with the entropy production theory: A case study of a micro horizontal axis river ducted turbine

Cited by 21 publications

References 41 publications

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Analisis Kinerja Turbin Hidrokinetik Dengan Selubung Diffuser Pada Kondisi Yaw Misalignment Berdasarkan Variasi Kecepatan Aliran Air

Systematic Review of Computational Fluid Dynamics Modelling and Simulation Techniques Employed in Vertical Axis Hydrokinetic Turbines

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