HYDRODYNAMIC CHARACTERISTICS OF MARINE PROPELLERS IN STEADY AND UNSTEADY WAKE FLOWS

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GHASEMI H.

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Journal Paper

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Journal: AMIRKABIR Year:2003 | Volume:14 | Issue:54-B Page(s): 81-98

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Information Journal Paper

Title

HYDRODYNAMIC CHARACTERISTICS OF MARINE PROPELLERS IN STEADY AND UNSTEADY WAKE FLOWS

Author(s)

GHASEMI H. | Issue Writer Certificate

Keywords

HYDRODYNAMIC PERFORMANCE

PRESSURE DISTRIBUTION

NON-UNIFORM WAKE

UNSTEADY FLOWS

Abstract

A marine propeller in unsteady wake flow is analyzed by using a potential-based boundary element method (BEM). Constant strength dipole and source distributions are used on each quadrilateral panels representing the propeller blades and their trailing vortex wakes. An analytical modification of Morino's method is adopted to determine the influence coefficients of source and dipole using hyperboloidal quadrilateral panels. This is very important for accuracy of the solutions. An iterative pressure Kutta (IPK) condition is applied to ensure pressure equality at the trailing of the blade. First, calculations were conducted for a steady flow to confirm the accuracy and the capability of the present method. Next, the calculations of the unsteady flow due to the ships wake were performed to calculate the fluctuating pressure acting on the propeller and consequently the thrust and torque. The thrust fluctuation for one blade and whole propeller are presented. The method is demonstrated for two propellers, one corresponding to the conventional propeller and one for a highly skewed. The unsteady PRESSURE DISTRIBUTIONs on the propeller blades determined by the method are in good agreement with experimental data obtained from full-scale propellers.

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APA: Copy

GHASEMI, H.. (2003). HYDRODYNAMIC CHARACTERISTICS OF MARINE PROPELLERS IN STEADY AND UNSTEADY WAKE FLOWS. AMIRKABIR, 14(54-B), 81-98. SID. https://sid.ir/paper/529116/en

Vancouver: Copy

GHASEMI H.. HYDRODYNAMIC CHARACTERISTICS OF MARINE PROPELLERS IN STEADY AND UNSTEADY WAKE FLOWS. AMIRKABIR[Internet]. 2003;14(54-B):81-98. Available from: https://sid.ir/paper/529116/en

IEEE: Copy

H. GHASEMI, “HYDRODYNAMIC CHARACTERISTICS OF MARINE PROPELLERS IN STEADY AND UNSTEADY WAKE FLOWS,” AMIRKABIR, vol. 14, no. 54-B, pp. 81–98, 2003, [Online]. Available: https://sid.ir/paper/529116/en

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