A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths

Download

index.pdf

Date

2020-04-01

Author

Maldar, Nauman Riyaz
Ng, Cheng Yee
Ean, Lee Woen
Oğuz, Elif
Fitriadhy, Ahmad
Kang, Hooi Siang

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

219
views

101
downloads

Several different designs and prototypes of ocean current turbines have been tested over recent years. For every design test, emphasis is given to achieving an optimum power output from the flow. In this study, the performance of a Horizontal Axis Ocean Current Turbine (HAOCT) has been investigated using three-dimensional Computational Fluid Dynamics (CFD) simulations for three cases, namely, (1) a turbine without a deflector, (2) a turbine with a deflector, and (3) a turbine with a deflector operating at a higher fluid depth. The turbine design was modeled in DesignModeler software and simulations were carried out in commercial CFD software Flow-3D. The Torque Coefficient (C-m) and Power Coefficient (C-p) for the turbine have been investigated for a certain range of Tip-Speed Ratios (TSRs) in a flow velocity of 0.7 m/s. Furthermore, comparisons have been made to demonstrate the effect of the deflector on the performance of the turbine and the influence of a higher fluid pressure on the same. The results from the simulations indicate that the higher value of C-p was achieved for Case 2 as compared to the other two cases. The findings from the study indicate that the use of the deflector enhances the performance of the turbine. Furthermore, a higher fluid pressure acting on the turbine has a significant effect on its performance.

Subject Keywords

Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Management, Monitoring, Policy and Law

URI

https://hdl.handle.net/11511/46457

Journal

SUSTAINABILITY

DOI

https://doi.org/10.3390/su12083333

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

A Numerical Study on the Behaviour of Suction Bucket Foundations for Offshore Wind Turbines under Cyclic Loading Yılmaz, Seyit Alp; Bakır, Bahadır Sadık; Taşan, Hacı Ercan; Department of Civil Engineering (2021-5-24) Suction bucket foundations simply consist of a cylinder skirt and a top plate, usually made of steel and installed by the assist of suction are a relatively new and economically favorable solution for offshore wind turbines which are exposed to high lateral loads from winds and waves both of which have cyclic characteristic. Understanding the behaviour under the effect of complex cyclic load environment is essential to assess the design requirements of bucket foundations. Deformations and pore pressures may...
A Numerical Study on the Behavior of Offshore Suction Bucket Foundations under Cyclic Lateral Loading Alp, Yilmaz S.; Ercan, Tasan H. (2020-01-01) Offshore wind turbines are exposed to high cyclic lateral loads induced by wind and waves which play a special role in the design of foundations. It's essential to clarify the bucket behavior under cyclic lateral loading to fulfil the design requirements of these foundations in both ultimate and serviceability limit states. In this study the behavior of monopods embedded in saturated sandy soil subjected to cyclic lateral loads were investigated using a sophisticated finite element model. The accumulation o...
A study on the behaviour of offshore suction bucket foundations under cyclic axial compressive loading Yilmaz, S. Alp; TAŞAN, HACI ERCAN (2021-10-01) Suction bucket foundations of offshore wind turbines (OWTs) are subjected to cyclic loads induced by wind and waves. The behaviour of buckets embedded in saturated sandy soil subjected to cyclic axial compression was studied using a finite element (FE) model. Accumulation of permanent soil deformations and excess pore water pressure in saturated sandy soil due to cyclic axial compression were taken into account by a fully coupled two-phase model combined with a hypoplastic constitutive model with intergranu...
One-year performance evaluation of two newly developed back-contact solar modules in two different climates ÖZDEN, TALAT; Carr, Anna J.; Geerligs, Bart (L. J. ); Turan, Raşit; Akınoğlu, Bülent Gültekin (Elsevier BV, 2020-01-01) To a certain extent, the photovoltaics industry is well developed, and the performance and expected yield of standard photovoltaic modules are well documented and researched. However, newer more efficient photovoltaic cell and module technologies are being developed all over the world. Outdoor testing of new photovoltaic technologies is very important to understand and validate their reliability and performance under different environmental conditions. For the first time, one year of monitored performance d...
A Review of the Hybrid Darrieus-Savonius Turbine for Hydrokinetic Applications Riyaz Maldar , Nauman; Yee Ng, Cheng; Oğuz, Elif (2022-01-13) In recent years, the cross-flow hydrokinetic turbines (HKTs) have been researched intensively owing to their key characteristics such as independency of flow direction and simple design. The Savonius turbine, being a drag-based device is known to have good starting performance. On the other hand, the lift-based Darrieus turbine, in several studies, has demonstrated reasonable efficiency over a wide range of flow velocities. To capitalize on the respective advantages, both the devices can be integrated toget...

Citation Formats

N. R. Maldar, C. Y. Ng, L. W. Ean, E. Oğuz, A. Fitriadhy, and H. S. Kang, “A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths,” SUSTAINABILITY, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46457.