Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine

Lin, Xiangfeng; Zhang, Jisheng; Zhang, Yuquan W.; Zhang, Jing; Liu, Sheng

doi:10.3390/w11030560

Cited by 12 publications

(7 citation statements)

References 38 publications

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“…Although several approaches exist for the purpose of multiobjective optimization design of the pumps and impellers, programs using computational uid dynamics (CFD) continues to be the most popular method [10][11][12]. ese programs, when run by high-performance computers, can forecast not only the functioning of the pump but also the ow eld upstream and downstream of the pump [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach

Zhang

Zheng

et al. 2019

Complexity

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A multiobjective optimization technique based on the computational uid dynamics (CFD) simulations and the orthogonal test is proposed to reduce the pressure pulsation in this paper. ree levels of four well-known performance factors L 9 (3 4 ) were considered in the orthogonal test scheme: the number of blades, the blade setting angle, the hub ratio, and the distance between the blade and the guide vane. e evaluation indexes corresponded to the head, e ciency, shaft power, and pressure pulsation, respectively. An optimal con guration A 2 B 1 C 2 D 3 was obtained by comprehensive frequency analysis method, after intuitive and range analysis. In comparison with the nonoptimized model, the new design's head and e ciency increased by 17.8% and 4.26%, whilst the shaft power and the pressure pulsation coe cient reduced by 1.22% and 11%, respectively. Experiments conducted on the optimized pump were consistent with the CFD model. Six di erent rotational speed conditions in the optimal operating points were numerically calculated in order to explore the internal hydraulic characteristics of the optimized axial ow pump. It is veri ed that the comprehensive frequency analysis method based on the orthogonal test approach is e ective for the multiobjective optimization of the axial ow pump.

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Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach

Zhang

Zheng

et al. 2019

Complexity

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“…The most comprehensive study is to account the whole tidal system and identify how both the turbine and the support interact with the tidal current [44]. This approach is called blade resolved as shown in Fig.2 (a) [79], [80]. However, there are limits to how far these concepts can be adopted, especially for the amount of difficulty and resource demand regarding the turbine geometry and nearby flow simulation.…”

Section: Rotor Thrust Representationmentioning

confidence: 99%

A Review on Numerical Development of Tidal Stream Turbine Performance and Wake Prediction

et al. 2020

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Recently, the output of Computational Fluid Dynamic (CFD) prediction on tidal stream turbine systems has been receiving great attention owing to the vast and untapped tidal stream potential. For several years, many publications have documented the accuracy of CFD methods for steady flows, but not for unsteady flows. A challenging area persisting in the computational field is its dependence on large computing resources, and the unsteady nature of usual tidal streams. To overcome this problem, researchers have proposed modelling simpler, representative devices or combined CFD with alternative predictive methods. Nevertheless, the turbulent modelling has been a critical issue in the CFD methods and great effort has been devoted to the study of turbulence and wave effect on the wake and functioning of the turbine. The present paper is a review of CFD application on tidal stream turbine performance in both steady and unsteady flows. The performance of the turbine predicted by actuator and blade resolved methods, has been in accordance with laboratory observations. Findings of the wake have been both consistent and inconsistent with measurements, arising from interpretation of the blade force, fluid-solving method and onset flow model, and downstream range distance. With regards to arrays, preliminary work shows turbine arrangement can have profound effects in the onset flow, and in consequence, the performance of adjacent turbine rows. The results reported appear to support the wind similarity assumption, such as wake Gaussian velocity distributions and fluctuating turbine output in unsteady flows. Under the influence of surface waves, the wake recovers faster than steady flow condition due to the flow's convective acceleration, but the mean performance stays almost equal. The findings in this paper give a critical review and insight of important implications for future turbine research, such as experimental validation of the turbine prediction output in small and large arrays. INDEX TERMS Computational fluid dynamic, tidal stream turbine, unsteady flow, turbine performance, wake characteristics.

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“…Since the primary concern of an OD relies on the hydrodynamic characteristics of the operating flow, its predictions through engineering tools, such as computational fluid dynamics (CFD), become important and are a concern in the plant design and economics [9][10][11][12]. Traditionally, studies of OD systems have treated the water and suspended solids as a single phase to determine the flow patterns and OD optimal configurations.…”

Section: Introductionmentioning

confidence: 99%

Study on Propellers Distribution and Flow Field in the Oxidation Ditch Based on Two-Phase CFD Model

Zhang

et al. 2019

Water

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The oxidation ditch (OD) plays an important role in wastewater treatment plants. With increasing demand and production costs, the energy consumption and sludge deposition occurring in the OD must be diminished to enhance its development. In this paper, a two-phase computational fluid dynamics (CFD) model of water and activated sludge examined the flow field characteristics of an OD, consisting of two side-by-side propellers. The system was studied under five configurations, where the spacing between the propellers was set equal to −0.2, −0.1, 0, 0.1, 0.2 times the length of the OD. The viscosity and settling rate of activated sludge was imported in the numerical simulation through a user defined function (UDF). The optimal scheme of the propeller’s power consumption, velocity distribution, and sludge concentration distribution was obtained. The result shows that sludge concentrations are linked with dead zone velocity but not necessarily with low velocities. Experiments confirmed the validity of the velocity flow field simulated by the two-phase CFD model. Overall, these findings form the basis for the propellers distribution optimization and allow a deeper insight into the flow field of OD systems.

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Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine

Cited by 12 publications

References 38 publications

Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach

Multiobjective Optimization Design and Experimental Investigation on the Axial Flow Pump with Orthogonal Test Approach

A Review on Numerical Development of Tidal Stream Turbine Performance and Wake Prediction

Study on Propellers Distribution and Flow Field in the Oxidation Ditch Based on Two-Phase CFD Model

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