Ice Loads on a Model Podded Propeller Blade in Milling Conditions

2005 ◽  
Author(s):  
Jungyong Wang ◽  
Ayhan Akinturk ◽  
Stephen J. Jones ◽  
Neil Bose
Keyword(s):  
Research Council ◽  
National Research Council ◽  
Propeller Blade ◽  
Hydrodynamic Loads ◽  
Ice Loads ◽  
Advance Ratio

Propeller-ice interaction experiments were conducted in the ice tank at the National Research Council of Canada’s Institute for Ocean Technology. A podded propeller was used in “Puller” mode and loads on an instrumented blade were measured. During the propeller-ice interaction, hydrodynamic loads and ice milling loads were acting on the propeller blade. This paper focuses on the ice milling loads both in water and in air. The ice milling loads, however, cannot be separated from the hydrodynamic loads perfectly. Even if the blade is milling the ice within an ice block, it is still experiencing hydrodynamic loads designated as inseparable hydrodynamic loads. The non-dimensional ice milling loads including inseparable hydrodynamic loads on the blade are presented against advance ratio with varied depths of cut. The results help to reduce the gap of knowledge for interaction between ice and propeller and give information about significant variables acting on the propeller blade during interaction.

Numerical Prediction of Model Podded Propeller-Ice Interaction Loads

2006 ◽  
Author(s):  
Jungyong Wang ◽  
Ayhan Akinturk ◽  
Neil Bose
Keyword(s):  
Prediction Model ◽  
National Research Council ◽  
Model Tests ◽  
Numerical Prediction ◽  
Panel Method ◽  
Operating Conditions ◽  
Propeller Blade ◽  
Hydrodynamic Loads ◽  
Hydrodynamic Calculations ◽  
Ice Loads

As the interest in arctic shipping and arctic exploration of oil and gas is increasing in recent years, the number of ice class vessels is increasing rapidly. Also the choices for propulsion devices are getting wider and these include podded propulsion systems. This study is a framework for the numerical prediction of the ice interaction loads acting on a podded propeller blade. The results of this study will help us to understand the propeller-ice interaction problem more comprehensively. Several studies for propeller-ice interaction have been carried out in the past few decades. Propeller-ice interaction, however, is a complicated process with a high level of uncertainties due to ice properties, ship operating conditions, and environmental conditions. Full-scale measurements involve high costs. In order to overcome these difficulties, model tests were carried out with model ice in an ice tank. The model tests provide well-controlled ice properties and interaction conditions to reduce the uncertainties. The tests were carried out in the ice tank with scaled down model ice at the National Research Council of Canada’s Institute for Ocean Technology. The ice loads acting on the propeller blade were measured with a six-component force and moment load cell fitted to the shaft and one of the propeller blades. Based on the experimental results, a numerical prediction model was developed to estimate the ice loads on the propeller blade. The numerical prediction is composed of three parts: the hydrodynamic calculations including separable and inseparable hydrodynamic loads, and the ice milling loads calculation. The separable and inseparable hydrodynamic loads can be obtained from clear water and blocked flow respectively. The hydrodynamic calculations were done by a low order panel method. The subroutines for calculating the ice milling loads are implemented into the panel method. The numerical prediction model for ice milling loads is described and the results are compared with those of experiments.

Measuring Ice Loading on Podded Propellers Systems

2003 ◽  
Author(s):  
Ayhan Akıntu¨rk ◽  
Stephen Jones ◽  
Corwyn Moores ◽  
John Bell
Keyword(s):  
Research Council ◽  
International Association ◽  
National Research Council ◽  
Experimental System ◽  
Propeller Shaft ◽  
Propulsion Systems ◽  
Lack Of Information ◽  
Ice Loads ◽  
Arctic Navigation ◽  
Thrust And Torque

Currently, work is ongoing to update all of the regulations governing the design of vessels for arctic navigation including the propulsion systems by the International Association of Classification Societies. However, there is a lack of information as to the loads occurring on podded propeller systems operating in ice. Hence, this study aims to close the knowledge gap for this type of propulsion systems. This paper describes the experimental setup designed and built at the National Research Council of Canada Institute for Marine Dynamics (NRC-IMD), for measuring ice loads on such a system. The experimental system is designed to measure the loads on three levels: 1– loads on an individual blade (six components), 2– loads on the propeller shaft (thrust and torque) and, the fore and aft bearings which support the propeller shaft (six components), 3– global forces and moments on the (propeller + pod + strut) system (six components).

Numerical Prediction of Propeller Performance During Propeller-Ice Interaction

2009 ◽  
Vol 46 (03) ◽  
pp. 123-139
Author(s):  
Jungyong Wang ◽  
Ayhan Akinturk ◽  
Neil Bose
Keyword(s):  
Prediction Model ◽  
Empirical Model ◽  
Empirical Formula ◽  
Numerical Prediction ◽  
Experimental Results ◽  
Hydrodynamic Load ◽  
Propeller Blade ◽  
Hydrodynamic Loads ◽  
Ice Loads ◽  
Propeller Performance

The aim of the present study was to predict propeller performance during propeller-ice interaction. Total loads acting on a propeller blade during propeller-ice interaction were assumed to consist of three major components: separable hydrodynamic loads, inseparable hydrodynamic loads, and ice milling loads. A panel method and an empirical formula were used for the hydrodynamic load calculations and the ice contact load calculations, respectively. This empirical model was implemented into a numerical panel code. The numerical prediction model for the ice loads including the detailed implementation is described, and the results are compared with experimental results.

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