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.
Highlights
Non-uniform wakes at the ship stern are significantly impressive on the hydrodynamic performance and structural characteristics of the marine propellers
Ji et al [6] investigated the cavitating flow around a submerged propeller under a non-uniform wake, numerically. They studied the excited pressure fluctuation around the propellers operating in a non-uniform wake and shown that the major source of the pressure fluctuations is the acceleration generated by the changes of the cavity volume [7]
The variations of the thrust and torque coefficient fluctuations of the B-series propeller under nonuniform wake behind the Seiun-Maru ship and INSEAN 7000 DWT Tanker hulls were investigated
Summary
Non-uniform wakes at the ship stern are significantly impressive on the hydrodynamic performance and structural characteristics of the marine propellers. On one hand, these wakes cause to fluctuating loads on the propulsive system. Several experimental tests and numerical studied are conducted to study of ship hull wakes by researchers [1,2,3,4,5,6,7,8,9,10,11,12] In this regards, pressure distribution, open water characteristics and thrust fluctuation of conventional and highly skewed propellers under nonuniform wakes are studied numerically by Ghassemi [5]. Effects of wake scale on the pressure fluctuations factors is studied with a simulation procedure
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