Flow Field Analysis And Structure Optimization Of Dust Collector For Road Sweeper

Road sweepers,as the important equipment for urban road cleaning,have the function of cleaning roads,reducing road particle pollution and improving the quality of urban living environment.They have been used in recent years.At present,most of the researches on the dust removable system of sweeper vehicles are focused on the improvement of structure and dust removal theory.There is little research on the performance of dust removal filtration,and there is no comparative study on the airstream distribution of the dust collector with different types of air guide improvement schemes.Therefore,this article takes the dust removal collector of the last stage dust removal device of a company's sweeper vehicle as the research object,adopts the simulation analysis method to obtain the air distribution inside the collector,and proposes the use of the guide plate intervention method to improve the structural scheme of air distribution and dust collection efficiency.The main work of the thesis is as follows:(1)The structure of the sweeper,the principle of dust removal from the sweeper and the related theory of fluid analysis of the dust collector is introduced.According to the structural parameters of the last level of the dust box of an enterprise,a three-dimensional physical simulation model was established to complete the division of the grid.Through simulation analysis,it was found that the airflow within the dust box was distributed badly,and the dust volume between the filter cartridges was greatly different.(2)According to the results of the analysis of the original model,three types of schemes are proposed: single baffle intervention,multiple baffle interventions of the same type,and combined baffle intervention.The effect of different types of improvements on airflow distribution is studied.The maximum and negative deviations of the flow distribution between the filter cartridges,the maximum flow non-uniformity coefficient,and the integrated amplitude was used as evaluation indicators to compare and analyze the simulation results.(3)For the same type of improvement,it is better to provide a vertical deflector in the lower area of the filter cartridge than the inclined deflector.(4)For different types of schemes,the airflow distribution between cartridges is: the best combination of deflectors,multiple deflectors of the same type,followed by a single deflector.In the combined baffle,the inclined baffle is set at 148 mm in front of the air inlet,and the air distribution between the filter cartridges is the most uniform.The gas-solid two-phase flow analysis was carried out.Compared with the original model's discrete phase simulation results,the average particle residence time of this scheme was smaller than that of the original model.(5)Based on the combination of the deflectors,the influence of different distances between the inclined deflector and the air inlet on the flow distribution was analyzed.It was found that when the distance between the inclined deflector and the lower edge of the air inlet is 88 mm,the air flow distribution is more uniform.