| Road sweeper is used more and more widely. As a key component of road sweeper, performance of dust collector directly affects the removal efficiency of road sweeper. This paper is based on the light road sweeper. In this paper some performances of dust collector are analyzed, including airflow distribution uniformity, particle phase deposition and flow rate distribution etc.Firstly, the numerical model of dust collector was set up according to the structure parameters of dust collector. By adjusting the global grid size of numerical model to control the number of mesh, comparison analysis is repeated until the calculation results error was less than 5%. The appropriate grid number and global grid size of numerical model were got to ensure the accuracy and reliability of numerical model.Secondly, the simulation was accomplished to discuss the two-phase flow in the dust collector through CFD. Velocity distribution and discrete phase distribution of flow field were researched. The results showed that differences of particle residence time between the different particle size decreased and flow rate standard deviation was increased with the increase of inlet flow rate. Due to the jet phenomenon, airflow velocity on the wall was increased and the airflow distribution was uneven.Again, the inclined baffle was employed to improve airflow distribution in dust collector. Based on the uniform design method, unevenness was considered as the test parameter. After multiple regression analysis, regression model of test parameter and the inclined plate structure parameters was established. Based on the regression model, influence of different structure parameters on the unevenness and the optimization scheme were obtained.Finally, the numerical model of dust collector was set up according to the optimization scheme. Some performances of dust collector were analyzed, including the velocity distribution in the center of cartridge, the velocity between cartridges, particle residence time and flow rate distribution etc. Comparison of the results before and after optimization showed that the velocity in the center of cartridge decreased obviously after adding the inclined baffle, and the velocity distribution between cartridges was improved with maximum speed reducing from 1.4m/s to 0.7m / s. Under 20% flow rate of fan, the residence time of same particle decreased obviously. Maximum and minimum residence time reduced from 3.3097 s to 2.5484 s and from 3.2378 s to 2.0609 s respectively. At the same time, particles were trapped in shorter time by cartridges and working efficiency of the dust collector was improved. Under 20% flow rate of fan, flow rate standard deviation meets the general design requirements of 15%. |
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