Hydrodynamic Performance of Marine Propellers in Steady and Unsteady Wake Flows

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TypeTechnical Report
Series titleTechnical Report
SubjectBoundary Element Method; Fluctuating Pressure; Hydrodynamics Characteristics; Flow Field Analysis
AbstractA marine propeller in unsteady wake flow is analyzed by using a potential-based boundary element method. Constant strength dipole and source distributions are used on each quadrilateral panel 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 to the accuracy of the solutions. An iterative pressure Kutta (IPK) condition is applied to ensure pressure equality at the trailing edge 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 ship's 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 the 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 from full-scale propellers.
Publication date
PublisherNational Research Council Canada. Institute for Marine Dynamics
PlaceSt. John's, NL
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NRC number5487
NPARC number8895883
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Record identifierc4d35aae-eb7c-4781-8c04-4b67c236c250
Record created2009-04-22
Record modified2016-10-03
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