Ice loads on propellers under extreme operating conditions

• Main Author: Varma, Gottumukkala Chandrasekhar, 1975-
• Other Authors: Memorial University of Newfoundland. Faculty of Engineering and Applied Science.
• Format: Text
• Language: English
• Published: 2000
• Subjects: Ice breaking operations > Simulation methods; Propellers; Newfoundland studies; University of Newfoundland
• Online Access: http://collections.mun.ca/cdm/ref/collection/theses4/id/139919

Thesis (M.Eng.)--Memorial University of Newfoundland, 2001. Engineering and Applied Science Bibliography: leaves 78-84 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.