| The navigation of ships in the region of brushed ice is always a key problem under the current research,and the interference between ice and propeller has become a key point.When the brushed ice is large,the moving brushed ice will slide along the side of the ship or the tail and affect the flow field around the propeller,thus affecting the hydrodynamic performance of the propeller,and this effect will change with time.When the ice-propeller is in contact with each other,the propeller is subjected to intermittent pulsating force of brushed ice.Whether the ice impeller is in contact or not,the performance of the propeller will be greatly affected.At present,it takes a lot of manpower and material resources to realize the simulation of ice impeller interference with each other by experimental or theoretical methods.Moreover,due to the complex coupling mechanism,it is very difficult to carry out experimental or theoretical analysis.With the continuous improvement and maturity of CFD technology,the computational simulation method has become one of the powerful tools to simulate the interaction of ice impeller.Firstly,ICEPROPELLER and a certain type of hull were selected as the main research objects and STAR-CCM+software was used as the main research tool.The thrust curve and torque curve of ICEPROPELLER at different speeds were calculated by using the overlapped mesh method and the RANS model,and the calculated results were compared and analyzed with the model test.The calculation error was small,which verified the correctness and rationality of the calculation method in this paper.An ICEPROPELLER with a certain shape of ice was selected to carry out a computational simulation of the interaction between the hydrodynamic forces of the ICEPROPELLER and the ice.The superimposed mesh was used to model the outer motion domain of the ice cube and the rotation domain of the propeller.The size,inlet speed,axial and radial position of the initial release of ice were changed.It was found that under the action of paddle suction,the ice mainly moved in the axial direction.There will be "acceleration area" and "blocking area" behind the ice,which have a great impact on the hydrodynamic performance of the propeller.As the newly launched icebreaker,a certain type of icebreaker makes up for many gaps in the design and construction of icebreakers in China.In this paper,a model of a certain type of icebreaker sailing in the region of brushed ice is established,and the changes of the total resistance of the ship under different speeds and the density of brushed ice are calculated.In this paper,the problem of sailing in the brushed ice area with the integrated propeller of a certain type of icebreaker is preliminarily explored,and the distribution law of the brushed ice around the hull and at the stern of the icebreaker is analyzed by giving the propeller different rotating speeds.At the same time,the motion simulation of a certain type of icebreaker body reversing in the ice-breaking region is carried out,and the time-domain curve of the ice-breaking is the contact collision of the ice propeller. |
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