Motion Responses Analysis for Tidal Current Energy Platform: Quad-Spar and Catamaran Types
- PDF / 2,577,890 Bytes
- 11 Pages / 595 x 842 pts (A4) Page_size
- 11 Downloads / 162 Views
onses Analysis for Tidal Current Energy Platform: QuadSpar and Catamaran Types Sony JUNIANTO, MUKHTASOR*, Rudi Walujo PRASTIANTO, Wisnu WARDHANA Department of Ocean Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember (ITS), Surabaya, Republic of Indonesia Received February 28, 2020; revised June 19, 2020; accepted July 8, 2020 ©2020 Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature Abstract One approach to support floating tidal current turbines is by using a moored catamaran, a barge type platform. Considering its low draft, one might expect that it performs best at typical straits with sea states of small wavelets to small waves. The problem is that the high rotational motion responses of the catamaran due to wave loads tend to reduce the turbine performance. This paper looks for a possibility to deteriorate these rotational responses by introducing a platform with four buoyant legs referred to as a quad-spar considering its good stability performance. The platforms are moored by four catenary cables as their mooring system. The motion response modeling was undertaken by Computational Fluid Dynamic (CFD) simulation based on three-dimensional potential flow theory. Considering sea states of straits with typical tidal current energy potentials, the environmental load was set on random wave with the significant wave height, Hs, of about 0.09 to 1.5 m and the wave period, T, of about 1.5 to 6 s corresponding to the wave frequency, ω, of about 1.1 to 4.2 rad/s. This study found that lower motion responses can be satisfied by the quad-spar, in which its yaw, roll and pitch responses are on average about 5%, 44%, and 38%, respectively, compared to those of the catamaran. This result indicates that the quad-spar is more effective in reducing rotational motion responses needed to keep a high performance of the tidal current energy system. Key words: floating platform, tidal current energy, CFD simulation, catamaran platform, quad-spar platform Citation: Junianto, S., Mukhtasor, Prastianto, R. W., Wardhana, W., 2020. Motion responses analysis for tidal current energy platform: Quadspar and catamaran types. China Ocean Eng., 34(5): 677–687, doi: https://doi.org/10.1007/s13344-020-0061-1
1 Introduction In recent years there has been a rapid development of tidal current energy system to extract kinetic energy in the body of seawater into useful energy in the form of electricity with a help of mechanical turbines and electrical generators (Melo and Jeffrey, 2018). One of the conversion technologies uses a floating system to utilize the tidal current energy near the seawater surface, e.g. Zhang et al. (2015), Mukhtasor et al. (2018), Junianto et al. (2018) and Mutsuda et al. (2019). A choice of types of the floating system requires their performance to work under environmental conditions of the potential sites. Man
Data Loading...
