Aerodynamic Performance of a New Double-Flap Wing Sail

Abstract

As a type of natural energy resource, wind power is used in the modern implementation of wind-assisted technologies as a method for reducing the fuel consumption and environmental pollution of ocean-going ships. In order to promote the full usage of ocean wind energy for cargo ships, an innovative type of ship propulsion-assisted wing sail is proposed in this paper. The propulsion efficiency of this new wing sail can be increased by enlarging its area in both the transverse and vertical directions in good weather conditions, and it can be folded up automatically in poor weather conditions, improving the sailing safety of the ship. The sail parameters relating to the gaps and rotation angles between different parts of the wing sail are compared, and the values giving the best aerodynamic performance are identified using CFD simulation technology. The results for the lift and drag coefficients for the new wing sail at different attack angles are also compared with those of traditional aerofoil sails, including an arc-shaped rigid sail and a variable-camber sail proposed in 2015. From the viewpoint of the sailing performance of the vessel, our results demonstrate that this new type of wing sail has good aerodynamic performance and can reduce fuel costs for commercial vessels.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • 1. Scupi A., Avital E. J., Dinu D., et al. (2015): Large Eddy Simulation of Flows around a Kite Used as an Auxiliary Propulsion System. Journal of Fluids Engineering, Vol. 137(10), 1-8.

  • 2. Naaijen P., Koster V., Dallinga V.(2006): On the Power Savings by an Auxiliary Kite Propulsion System. International Shipbuilding Progress, Vol. 53(4), 255-279.

  • 3. Grosan N., Dinu D. (2010): Considerations Regarding Kite Towed Ship’s Manoeuvring. Proceedings of the 3rd International Conference on Maritime and Naval Science and Engineering, 28-33, WSEAS, Constanta, Romania.

  • 4. Li Q., Nihei Y., Nakashima T., Ikeda Y. (2015): A Study on the Performance of Cascade Hard Sails and Sail-Equipped Vessels. Ocean Engineering, Vol. 98, 23-31.

  • 5. Bergeson L., Greenwald K.C. (1985): Sail Assists Developments 1979–1985. Journal of Wind Engineering and Industrial Aerodynamics, Vol. 19(1-3), 45-114.

  • 6. Scott D. (1985): Sail-Assist for Cargo Ships: Computer Controlled. Popular Science, Vol. 226, 68(3).

  • 7. Low H. T., Luo S. C., Winoto S. H. (1991): Flow Past a Wind-assisted Ship Propulsion Device. Ocean Engineering, Vol. 18(6), 555-565.

  • 8. Ueno M., Tsujimoto M., Takekawa M., Fujita H., et al. (2005): Fundamental Research for Development of an Advanced Sail-Assisted Ship. IEEE Techno-Ocean ‘05, Vol. 2, 1102-1109.

  • 9. Ouchi K., Uzawa K., Kanai A. (2011): Huge Hard Wing Sails for the Propulsor of Next Generation Sailing Vessel. The Second International Symposium on Marine Propulsors, Hamburg, Germany, June 2011.

  • 10. Ouchi K., Uzawa K., Kanai A., Katori M. (2013): “Wind Challenger”: The Next Generation Hybrid Sailing Vessel. The Third International Symposium on Marine Propulsors, Launceston, Tasmania, Australia, May 2013, 562-567.

  • 11. Burden A., Lloyd T., Mockler S., et al. (2010): Concept Design of a Fast Sail Assisted Feeder Container Ship. Main Report of Group Design Project, University of Southampton, School of Engineering Sciences, 58-59.

  • 12. Lin Y.(2013): Design and Research on a Flap-Wing Sail for a Wind-Assisted Vessel. Master’s thesis, Dalian Marine University, Dalian, China (in Chinese).

  • 13. Guo S.(2012): Optimized Design of a Wingsail and Study of Energy-Saving Applications for a Sail-Assisted Ship. Master’s thesis, Dalian Marine University, Dalian, China (in Chinese).

OPEN ACCESS

Journal + Issues

Search