Novel combined vortex fin eliminating device of pod propeller and design method thereof

Abstract

The invention relates to a novel combined vortex fin eliminating device of a pod propeller and a design method thereof, and the novel combined vortex fin eliminating device is arranged on a pod and ischaracterized by comprising a thrust fin and a cross tail fin. The design method comprises the steps of obtaining flow field information; primarily designing a thrust fin; determining the optimal size of the thrust fin; primarily designing a cross tail fin; determining the optimal size of the cross tail fin; and determining the optimal matching size of the combined fin. According to hydrodynamicperformance data of an actual nacelle and a propeller, adverse effects of trailing vortexes of the nacelle propeller are reduced, the influence of lateral force of rotation of the propeller on a nacelle structure is weakened, the adaptability of the nacelle propeller to different hydrodynamic environments is improved, the stability of a nacelle propelling system is improved, and the navigation cost is reduced on the whole; the stations of the thrust fins are flexibly adjusted, attack angle parameters are changed, and the hydrodynamic performance coefficient of the nacelle under the specific working condition is increased; and similarly, the telescopic cross tail fin can effectively improve the hydrodynamic performance in the rotation of the nacelle.

Description

technical field [0001] The invention relates to the technical field of ship propulsion, in particular to a novel combined vortex-eliminating fin device for a pod propeller and a design method thereof. Background technique [0002] With the gradual improvement of modern ship performance standards, the requirements for navigation performance, energy saving and environmental protection are becoming more and more stringent. As one of the new propulsion systems, the pod propulsion has achieved great success in the commercial field due to its outstanding features and performance. [0003] The towed pod propeller is a relatively common type of pod propeller in the market, and its propulsion form is completely different from the traditional propeller. The existence of the pod changes the original wake of the propeller to a certain extent, and the interaction between the wake and the pod changes the overall performance of the propeller. From the perspective of improving the overall...

AI Technical Summary

Problems solved by technology

[0005] 1. The overall hydrodynamic efficiency of the propeller is lower than that of the traditional propeller

The pod is located downstream of the propeller, which will generate greater resistance in the high-speed wake, reducing the overall thrust of the propeller, thereby reducing the propulsion efficiency

[0006] 2. The propeller will generate additional lateral force, which will affect the stability of the ship's course

The traditional pod propulsion is not capable of coping with the frequent switching of different working conditions of the ship, and cannot flexibly adjust its own hydrodynamic performance parameters

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