Reduction and Validation of Noise levels for Non-Cavitating Marine Propellers

Marine propellers are one of the dominant noise sources for under water vehicles. Marine propeller is the one of the major source of noise in marine vehicle. Marine propeller is used to propel the body. Either this body could be a marine vehicle of submarine, ship, boat, torpedo etc. So in any vehicle which ever run on water they all use of this marine propeller. So marine propeller is one of the significant and major part in a water moving vehicles. The purpose of the propeller is to produce the thrust in order to move the body either in forward or backward direction. If the propeller takes the clockwise rotation then the vehicle gets move in forward direction and vice versa. This paper presents investigation of noise levels for non-cavitating turbulent flow around marine propeller by varying pitch angle of propeller using the Eddy Viscosity model of Large Eddy Simulation (LES) which is available in Ansys 16.2 version software. Behaviour of propeller is investigated for hydrodynamic parameters later subjected to Computational Acoustic Analysis (CAA) using Ffowcs Wiliams – Hawkings formulations (FW-H). The analysis is carried out by considering pressure based, unsteady formulation of second order implicit. Noise is predicted with time – domain acoustic analogy along with finite volume method. Sound pressure Levels (SPL) are predicted at fixed position of receiver and these results are verified with static analysis on propellers by performance characteristics.