ABSTRACT

Simulations of the submarine propeller E1619 are presented using an in-house viscous CFD code with overset grid method. This code is based on the solution of the unsteady Reynolds averaged Navier-Stokes equations for simulating hydrodynamic performance of marine vehicles. Propeller open water curves were obtained for a wide range of advance coefficients, the viscous flow around the propeller was analyzed and results compared with available experimental data. DES model was used to calculate open water character curves of the propeller and capture wake flow. Comparison between computational simulation results and experimental data shows good agreement. Propeller tip vortex and the vortex structure after the blade were analyzed by post-processing. Numerical simulation shows that large amount of grid using overset grid method combined with DES turbulence model can be more accurate numerical prediction of the flow characteristics of propeller.

INTRODUCTION

Propeller hydrodynamic performance is a very important design parameter for submarines, because it has greatly influences on the speed and stealth capability of the submarine. A submarine propeller is larger than a surface ship propeller and has more blades for the purpose of reducing noise and maintaining propulsion quality. For the same torque, the additional blades may reduce the overall thrust and thus reduce both the performance and efficiency (Felli et al. 2008). Computational fluid dynamics (CFD) provides a fast and efficient method for analyzing new propeller designs in the condition of that experimental fluid dynamics (EFD) is costly because of expensive experimental prototypes, complex distractions and time consumption. However, CFD is also costly compared to other numerical approaches and must be validated before extensive use for design/test purposes. Propeller performance has been studied and experimentally tested for over 70 years. Current experimental procedures and corresponding uncertainty analysis are periodically updated by the International Towing Tank Conference (2002). Though submarine data is mostly unavailable because of military necessity, experimental results for the generic submarine propeller INSEAN E1619 were reported by Di Felice et al. (2009), who studied open water performance and the wake of the propeller under various loads.

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