A numerical study of scale effects on performance of a tractor type podded propeller

Open access

ABSTRACT

In this study, the scale effect on the performance of the podded propeller of tractor type is investigated. Turbulent flow computations are carried out for Reynolds numbers increasing progressively from model scale to full scale using the CFD analysis. The result of the flow calculation for model scale Reynolds numbers agrees well with that of the experiment of a large cavitation tunnel. The existing numerical analysis indicates that the performance of the podded propeller blades is mainly influenced by the advance coefficient and relatively little by the Reynolds number. However, the drag of pod housing with propeller in operation is different from that of pod housing without propeller due to the acceleration and swirl of propeller slipstream which is altered by propeller loading as well as the pressure recovery and friction according to Reynolds number, which suggests that the pod housing drag under the condition of propeller in operation is the key factor of the scale effect on the performance between model and full scale podded propellers. The so called ‘drag ratio’, which is the ratio of pod housing drag to total thrust of podded propeller, increases as the advance coefficient increases due to accelerated flow in the slipstream of the podded propeller. However, the increasing rate of the drag ratio reduces continuously as the Reynolds number increases from model to full scale progressively. The contribution of hydrodynamic forces, which acts on the parts composed of the pod housing with propeller operating in various loading conditions, to the thrust and the torque of the total propeller unit are presented for a range of Reynolds numbers from model to full scales.

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

  • Choi J.K. and Kim H.T. 2010. A study of using wall function for numerical analysis of high reynolds number turbulent flow. Journal of the Society of Naval Architects of Korea 47(5) pp.647-655.

  • Chicherine I.A. Lobatchev M.P. Pustoshny A.V. and Sanchez-Caja A. 2004. On a propulsion prediction procedure for ships with podded propulsors using RANS-Code analysis. Proceedings of Fist International Conference on Technological Advances in Podded Propulsion University of Newcastle UK 14-16 April 2004 pp.223-236.

  • Deniset F. Laurens J.M. and Romon S. 2006. Computation of the fluctuating pressure distribution on the pod strut. Proceedings of Second International Conference on Technological Advances in Podded Propulsion 2006 L'aber Wrac'h France 3-5 October 2006 pp.107-118.

  • Gaggero S. Villa D. and Brizzolara S. 2010. RANS and PANEL method for unsteady flow propeller analysis. Proceedings of 9th International Conference on Hydrodynamics Shangai China 11-15 October 2010 pp.564-569.

  • Holtrop J. 2001. Extrapolation of propulsion tests for ships with appendages and complex propulsors. Marine Technology 38(3) pp.145-157.

  • ITTC 2008. The specialist committee on azimuthing podded propulsion. Proceedings of 25th ITTC 2 pp.563-603.

  • ITTC 2005. The specialist committee on azimthing podded propulsion : final report and recommendations to the 24th ITTC. Proceedings of 24th ITTC Edinburgh 2 pp.543-600.

  • Kim D.S. and Kim H.T. 2002. Analysis of open-water characteristics of marine propeller by computational method for viscous flow. Journal of the Society of Naval Architects of Korea 39(3) pp.8-17.

  • Lobatchev M.P. and Chicherine I.A. 2001. The fullscale resistance estimation for podded propulsion system by RANS method. Lavrentiev Lectures Proceeding of International Symposium on Ship Propulsion St. Petersburg Russia 19-21 June 2001 pp.39-44.

  • Ohashi K. and Hino T. 2004. Numerical simulations of flows around a ship with podded propulsor. Proceedings of Fist International Conference on Technological Advances in Podded Propulsion University of Newcastle UK 14-16 April 2004 pp.211-221.

  • Park H.G. Choi J.K. and Kim H.T. 2013. An estimation method of full scale performance for pulling type podded propellers. Proceeding of The Third International Symposium on Marine Propulsors Launceston Tasmania Australia 5-8 May 2013 pp.78-86.

  • Sanchez-Caja A. and Pylkkanen J.V. 2004. On the hydrodynamic design of podded propulsors for fast commercial vessels. Proceedings of Fist International Conference on Technological Advances in Podded Propulsion University of Newcastle UK 14-16 April 2004 pp.201-210.

  • Sasaki N. Laapio J. Fagerstrom B. Juurma K. and Wilkman G. 2004. Full scale performance of double acting tankers mastera & tempera. Proceedings of Fist International Conference on Technological Advances in Podded Propulsion University of Newcastle UK 14-16 April 2004 pp.155-172.

  • Zhang L. and Wang Y. 2006. Discussion on hydrodynamic performance for podded propeller by using surface panel method. Proceedings of Second International Conference on Technological Advances in Podded Propulsion 2006 L'aber Wrac'h France 3-5 October 2006 pp.15-25.

Search
Journal information
Impact Factor


IMPACT FACTOR 2017: 0.930
5-year IMPACT FACTOR: 0.997

CiteScore 2018: 2.03

SCImago Journal Rank (SJR) 2018: 0.826
Source Normalized Impact per Paper (SNIP) 2018: 1.741

Metrics
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 192 122 0
PDF Downloads 74 54 0