Ice loads on propellers under extreme operating conditions

Varma, Gottumukkala Chandrasekhar (2000) Ice loads on propellers under extreme operating conditions. Masters thesis, Memorial University of Newfoundland.

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Abstract

The research focus is on ice-class propellers. Methods exist for predicting hydrodynamic and contact ice loads on conventional ice-class propellers under normal operating conditions in ice. These have been used to develop a preliminary design and analysis procedure for propeller blade strength. The present research aims to extend these ice load predictions to extreme and transient operating conditions. -- To address these extreme conditions, a numerical model was developed using existing empirical results of ice-structure interaction. This model was incorporated into an existing Fortran code for predicting ice loads on propellers under normal operating conditions. The refined code was used to predict loads on a series of propellers under extreme operating conditions such as when the propeller was stopped and the ship is moving and these results were used to check the design procedure. -- To verify the correctness of the numerical model a series of model scale indentation tests were performed at the Institute of Marine Dynamics, using an MTS machine. A propeller blade shaped indentor with a geometry of that of R-Class propeller was used as an indentor to indent against laboratory grown ice. The tests were performed at high speeds. These results are compared with the numerical simulations.

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