Abstract
CFD commercial software FLUENT, based on solving RANS equations, was used to calculate propeller hydrodynamic performance and exciting force. Sliding grid technique was applied to simulate the propeller rotation. Different advance coefficients and oblique inflow angles were set as different working conditions through adjusting inflow magnitude and direction. DTMB4679 propeller as the research object, hydrodynamic performance of this propeller in oblique flow was first calculated, and agreed well with test results. It verifies the accuracy of calculation method. The time-domain data of propeller exciting force under different working conditions was monitored, and then spectrum curve was obtained through fast Fourier transform. The results show that propeller load in oblique flow will aggravate, and transverse velocity component of oblique flow will cause great transverse force generated by propeller. Moreover, the smaller advance coefficient causes the greater peak of propeller fluctuating pressure. Additionally, oblique flow angle has a greater influence on unsteady bearing force than fluctuating pressure.
Highlights
There is periodical exciting force in the stern when propeller works in non-uniform flow field of three directions
Tan Yanshou [5] used perturbation potential based on surface panel method to calculate unsteady propeller bearing force, and it had a good precision that calculating results are compared with test results
Chen Ruxing et al [6] based on CFX sliding grid technique to predict unsteady hydrodynamic performance of propeller in axial wake field, and their calculating results agreed well with proposed value given by the literature
Summary
There is periodical exciting force in the stern when propeller works in non-uniform flow field of three directions. Chen Ruxing et al [6] based on CFX sliding grid technique to predict unsteady hydrodynamic performance of propeller in axial wake field, and their calculating results agreed well with proposed value given by the literature They analyzed the varying pattern of propeller exciting force, and provided an analysis method for numerical calculation of propeller exciting force. When the ship backs up under certain rudder angle, the stern flow will form oblique flow because of the effect of rudder blade guiding flow Through researching, it found that when the propeller work in oblique flow field, the thrust and torque will be affected in a certain degree, and fiercer exciting force will be induced, including oblique flow transverse force which is against for ship maneuverability. The influence of advance coefficient and oblique flow angle to propeller exciting force under oblique flow condition will be summarized
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