Yazar "Shi, Weichao" seçeneğine göre listele

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    Design and optimization of the hydrokinetic turbine blades using statistical approaches
    (Pergamon-Elsevier Science Ltd, 2026) Kale, Fatih Mehmet; Yilmaz, Naz; Bademlioglu, Ali Husnu; Sokmen, Kemal Furkan; Shi, Weichao
    In this study, the design and optimization of Horizontal Axis Hydrokinetic Turbine (HAHT) blades were carried out using statistical approaches. Taguchi and ANOVA analyses were employed as the statistical methods. Initially, experimental and detailed computational analyses were conducted to predict the hydrodynamic performance of a HAHT. Subsequently, Taguchi and ANOVA analyses were performed to investigate the effects of design parameters such as thickness ratio (t/c), pitch angle (phi) and twist angle (theta) on the hydrodynamic performance of HAHT blades for different r/R blade sections 0.4, 0.6 and 0.8, and the optimal design parameters were identified. The study aims to investigate the effect of the design parameters, which are the most important in HAHT designs, on the power coefficient (CP) and to obtain the maximum CP for the existing HAHT as a result of changes proposed by the Taguchi and ANOVA optimization method. For the optimal HAHT geometry, the CP increase is observed between 2 % and 6 % at different TSR values. As a result of the analyses, the maximum CP was obtained as 0.4499 for the optimal design parameters. Additionally, it was concluded that the pitch angle was the most influential parameter on CP. Overall, the optimized blade provided a maximum 6 % increase in CP at TSR 5 compared to the initial design, and the pitch angle affected more than 96 % of this improvement compared to other parameters.
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    Experimental and numerical investigations of hydrodynamic performance for horizontal-axis hydrokinetic turbines
    (Univ Zagreb Fac Mechanical Engineering & Naval Architecture, 2025) Kale, Fatih Mehmet; Yilmaz, Naz; Sokmen, Kemal Furkan; Shi, Weichao
    This paper presents both experimental and numerical investigations of the hydrodynamic performance of Horizontal-axis Hydrokinetic Turbines (HAHTs) using experimental methods and Computational Fluid Dynamics (CFD) approaches, respectively. The innovative aspect of this study lies in the consistency of the results, achieved by aligning the method used in the CFD analyses for Hydrokinetic Turbines (HKTs) and airfoil profiles with experimental data. For this purpose, 2-D CFD analyses were first conducted with blade section geometries (Eppler 395 and S1210), which are commonly used in HKT designs. The aerodynamic characteristics (CL and CL/CD) of these blade sections were computed and compared with the experiments. Subsequently, a three-dimensional (3-D) turbine geometry, featuring three different pitch angles (PAs), was simulated using CFD, and the results were compared with experimental data obtained under the same operating conditions in the Emerson Cavitation Tunnel (ECT) at Newcastle University. The comparisons showed good agreement while the maximum relative error was calculated less than 10 % for the power coefficient (CP) of the turbine with a PA of 0 degrees. For the other PA (8 degrees), the maximum relative error was 11 % for CP and 14 % for the thrust coefficient (CT). The CFD investigations of HKTs revealed that the Detached Eddy Simulation (DES) model has less relative errors compared to the other turbulence models at the same Tip Speed Ratio (TSR) values, while the Sliding Mesh (SM) method describing rotation gives more consistent and closer results to the experiments, with the investigation of y+ point of view.
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    Taguchi and CFD-based hydrodynamic performance investigations of diffuser-augmented hydrokinetic turbines
    (Pergamon-Elsevier Science Ltd, 2026) Kale, Fatih Mehmet; Yilmaz, Naz; Bademlioglu, Ali Husnu; Sokmen, Kemal Furkan; Shi, Weichao
    In recent years, interest in renewable energy technologies has been increasing as part of the effort to obtain clean energy. One of these technologies, Hydrokinetic Turbines (HKT), converts the kinetic energy of water flow into electricity. However, these turbines fail to reach the theoretically calculated power coefficient (CP). To overcome this issue, researchers are developing various diffuser designs to enhance efficiency. In this study, the effects of the parameters used in diffuser design (foil type, diffuser length, tip clearance, and angle of attack) on the CP were investigated using Taguchi analysis, and an optimum diffuser design was developed for the Horizontal Axis Hydrokinetic Turbine (HAHT) based on the obtained experimental results. For the validation study of HAHT and CP calculations of the Diffuser-Augmented Hydrokinetic Turbine (DAHT), the Computational Fluid Dynamics (CFD) method was employed. According to the results of the Taguchi analysis, it was determined that diffuser length is the most influential parameter on the CP. Additionally, it was found that the effect of tip clearance on CP is relatively limited compared to other parameters. For the optimum operating parameters, maximum CP value was calculated as 0.7006. Consequently, a 67 % increase in the CP of the existing HAHT was achieved.