Analysis Of Driving Performance Of Folded Impeller Of Ship Tractor

As an important part of the ship tractor,the blade has great influence on the driving efficiency and work quality of the ship tractor.In order to further reduce the rolling resistance of the blade-soil contact process and improve its driving performance,this paper combines the smooth particle hydrodynamics(SPH)based on the optimized structure of the HH709 S type tractor tractor straight wheel.The influence of the structural parameters of the single-folded vane and the relative position of the folding vane unit group on the driving performance was analyzed.The specific research work is as follows:1.In this paper,the parameters of water field density,water content,internal friction angle and cohesion in a certain area of Wuhan are measured by experiments.Combined with the simulation analysis of smooth particle hydrodynamics(SPH),the single-folded vane and the whole folded impeller are constructed.The kinetic model of coupling with soil laid the foundation.2.Combined with the SPH method,based on the optimized structure of the straight wheel blades of the HH709 S ship tractor studied earlier by the research group,a single-flange wheel-soil smooth particle hydrodynamic model was constructed.Through numerical calculation,the single-flange wheel was studied The action mechanism of the leaf and the soil has obtained the range of the depth of the single-bladed wheel blade into the soil,and then analyzed the influence of the inclination angle of the driven surface of the folded wheel blade,the radius at the corner,and the inclination angle of the non-driven surface on the driving performance,and obtained the best driving performance.Folded wheel structure The reliability of the hydrodynamic model of the single-bladed wheel-soil smooth particles was confirmed by constructing an experimental platform for soil troughs.3.Based on the optimization of the single-folded vane structure,the fluid-dynamic model of the impeller-soil smoothing particle of the driving wheel-flap surface is constructed.The "folding vane unit group" is proposed to analyze the two-wheel of the driving wheel unit group.The angle between the angle,the radius of the mid-point of the two-wheel width of the unit group,and the influence of the logarithmic structureparameters of the unit group on the driving performance.The SPH simulation analysis finally obtains the driving wheel surface of the driving wheel with the best driving effect.The research results show that the driving efficiency of the optimized single-folded bucket structure is increased by 15.03% compared with the original straight blade of the HH709 S ship tractor,which is 13.65% higher than the optimized straight impeller,and the propulsion work is improved by 8.13 %,the impeller vane drive performance has been significantly improved;for the entire folded impeller,compared with the HH709 S type ship tractor original straight impeller structure,the driving efficiency increased by25.7%,compared to the optimized straight impeller structure,the driving efficiency It has increased by 14.2% and its drive performance has been significantly improved.The research results of this paper provide a theoretical basis for the structural design of the ship tractor driving wheel,and have important guiding significance for improving the driving performance of the ship tractor’s paddy field driving impeller structure.