Next Article in Journal
A Novel Pitch Control System of a Large Wind Turbine Using Two-Degree-of-Freedom Motion Control with Feedback Linearization Control
Next Article in Special Issue
Optimal Site Selection of Tidal Power Plants Using a Novel Method: A Case in China
Previous Article in Journal
Sustainability Enhancement of a Turbine Vane Manufacturing Cell through Digital Simulation-Based Design
Previous Article in Special Issue
High-Resolution Wave Energy Assessment in Shallow Water Accounting for Tides
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Energies 2016, 9(10), 789; doi:10.3390/en9100789

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

1,2,* , 3
and
1,2
1
Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China
2
Qingdao Municiple Key Laboratory of Ocean Renewable Energy, Ocean University of China, Qingdao 266100, China
3
College of Engineering, Ocean University of China, Qingdao 266100, China
*
Author to whom correspondence should be addressed.
Academic Editor: Stephen Nash
Received: 10 July 2016 / Revised: 17 September 2016 / Accepted: 22 September 2016 / Published: 29 September 2016
(This article belongs to the Special Issue Numerical Modelling of Wave and Tidal Energy)
View Full-Text   |   Download PDF [5477 KB, uploaded 29 September 2016]   |  

Abstract

Self-starting performance is a key factor in the evaluation of a Darrieus straight-bladed vertical axis turbine. Most traditional studies have analyzed the turbine’s self-starting capability using the experimental and numerical data of the forced rotation. A 2D numerical model based on the computational fluid dynamics (CFD) software ANSYS-Fluent was developed to simulate the self-starting process of the rotor at constant incident water-flow velocities. The vertical-axis turbine (VAT) rotor is driven directly by the resultant torque generated by the water flow and system loads, including the friction and reverse loads of the generator. It is found that the incident flow velocity and the moment of inertia of the rotor have little effect on the averaged values of tip-speed ratios in the equilibrium stage under no-load conditions. In the system load calculations, four modes of the self-starting were found: stable equilibrium mode, unstable equilibrium mode, switch mode and halt mode. The dimensionless power coefficient in the simulations of passive rotation conditions is found to be, on average, 38% higher than those achieved in the simulations of forced rotation conditions. View Full-Text
Keywords: tidal stream energy; vertical axis turbine; Darrieus type; self-starting; numerical study tidal stream energy; vertical axis turbine; Darrieus type; self-starting; numerical study
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Liu, Z.; Qu, H.; Shi, H. Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion. Energies 2016, 9, 789.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top