Performance prediction of Marine propeller using steady and unsteady flow approaches

  • Obwogi Enock Omweri Jomo Kenyatta University of Agriculture and Technology
  • JAred Ondieki Amisi Jomo Kenyatta University of Agriculture and Technology
  • S. Hai Long Harbin Engineering University

Abstract

MOST  work presented on marine propeller performance prediction using Computational Fluid dynamics  is based on suitability of grid density and turbulent models. Finer grids have shown better results as opposed to coarse grids. On the other hand, turbulent models have shown different strengths. In this paper, therefore, simulations are performed by computational fluid dynamics (CFD) code using both steady and unsteady flows. The main aim of this study is to investigate the propeller performance using the steady and unsteady flow state. To study the subject, 5.72 m diameter, right hand skewed propeller was  selected. Open water characteristics were then determined for both techniques. A validation study was carried out where CFD results were compared to extrapolated experimental data. Generally there was good agreement between the CFD results and experimental data. The numerical results demonstrate that the data calculated by unsteady flow approach for Thrust Coefficient and Torque Coefficient is more reliable than that obtained by steady flow approach. However, steady state approach provides better results  for open water efficiency. The current study results will be of importance during propeller design and optimization.
Keywords—  CFD; steady flow; unsteady flow; propeller performance; validation study
Published
Sep 26, 2017
How to Cite
OMWERI, Obwogi Enock; AMISI, JAred Ondieki; LONG, S. Hai. Performance prediction of Marine propeller using steady and unsteady flow approaches. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 126-133, sep. 2017. ISSN 2079-6226. Available at: <http://sri.jkuat.ac.ke/ojs/index.php/proceedings/article/view/588>. Date accessed: 24 feb. 2018.