International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 08 | Aug 2023
p-ISSN: 2395-0072
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Depict and Analysis of the nomadic kuroshio turbine blades Yadluri Ravi Kishore 1 1Sr.Assistant Professor, Dept of Mechanical Engineering,
Aditya College of Engineering and Technology , Affiliated to JNTUK , Surampalem Andhra Pradesh, India. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - The most common devices used for extracting the
turbine, and the power generation system presented in this paper is a Nomadic Kuroshio turbine (NKT, as shown in Fig. 1) which is a horizontal axis current turbine developed using the Kuroshio Current as its energy source.
ocean current energy are the current turbines. Most people use the wind turbine blade design methods for the horizontal axis current turbine design; however, the current turbines operate in the water, and their physical behaviours are more like marine propellers. In this paper, two turbine blade design procedures are adopted. The first design procedure is similar to the propeller designs, and the second design procedure is to use Genetic Algorithm and boundary element method (BEM) to find a geometry which can provide the maximum torque. After completing the designs, hydrodynamic performances of the marine current turbine are then computed and analysed by the potential flow BEM and the viscous flow RANS method. The computational results show the geometries designed by the presented procedures can not only satisfy the hydrodynamic design goal, but also predict the delivered power very close to the experimental data. After the blade performance meets the design target, the performances of designed 20kw nomadic type Kuroshio turbine including the floating body at different operation conditions are demonstrated in the paper. Also, the structural strength of the turbine blade is computed by FEM, and the results are evaluated to see if the design complies the rule requirements.
Fig. 1 The computer depiction of the 20kw Nomadic Kuroshio Turbine In this paper, the design procedure and performance analysis of the NKT are presented. First of all, the design target of this generator must be established. The generator designed in this paper is based on two horizontal shaft generators and must reach 20kW of power generation. In other words, a single-sided turbine must achieve a design target of at least 10 kW. Most people use the wind turbine blade design methods for the horizontal axis current turbine design; however, the current turbines operate in the water, and their physical behaviours are more like marine propellers. In this paper, two turbine blade design procedures are adopted. The first design procedure is similar to the propeller designs, and lifting line method [1-2], lifting surface design method [3], and boundary element method [4] are used. The second design procedure is to use Genetic Algorithm and boundary element method (BEM) [5] to find a geometry which can provide the maximum torque, and also used to design chord-length distribution. After completing the blade geometry designs, both the BEM and the viscous flow RANS method [6] are applied to the analysis of performances of current turbines to confirm the designs. The performances were calculated based on a 1/5 scale of 20kW demonstration unit; however, the experimental unit was tested with a 1/25 scale at NTU (National Taiwan University) towing tank. In this paper, we also present the comparison between computational results and experimental data, and the comparison shows that the
Key Words: Kuroshio, current turbine blade design, boundary element method, RANS, FEM
1.INTRODUCTION With the international highly attention to all kinds of energy issues, Taiwan is bound to examine the state of energy problem in the country. Since Taiwan currently does not have exploitation of non-renewable energy sources, it must rely on foreign imports and lack of the ability to supply energy on its own. In this situation, the application of renewable energy is another solution to the energy problem. There are many types of renewable energy, such as solar power and wind power that have been used successfully. However, from the point of view of the country's use of electricity, ocean current power generated from ocean energy is not affected by seasonal and weather factors. It can provide stable energy, and it is a very good choice as a baseload energy resource. The Kuroshio that flows through the outer seas of Taiwan is the ocean current that begins from Philippines and crosses through Taiwan and flows along Japan in the northeast direction. Two most common devices used for extracting the ocean current energy are the horizontal axis current turbine and the vertical axis current
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