Regular Article

Obtaining mathematical functions of the propeller thrust and torque coefficients fluctuations at non-uniform wake flow including geometry effects

Department of Maritime Engineering, Amirkabir University of Technology, Hafez Ave, No 424, 15875-4413 Tehran, Iran

^* e-mail: gasemi@aut.ac.ir

Received: 20 July 2017
Accepted: 1 March 2018

Abstract

The main purpose of this paper is to obtain mathematical functions of the propeller thrust and torque coefficients fluctuations at non-uniform flow. Two types of inflow wakes from Seiun-Maru ship and INSEAN 7000 DWT Tanker are investigated for the B-series propeller. The computed results include the thrust and torque coefficients fluctuations and their mathematical functions under the influence of two different wakes for one blade and all blades of the studied propellers. To this accomplishment, variation of thrusts and torques coefficients under different pitch ratio, expanded area ratio and number of blades are investigated using classical mathematical methods in one cycle and the Fourier coefficients with ten terms are presented for each case. The results of thrust and torque coefficients at different propeller geometries are presented and discussed.