SIMULATION AND DESIGN ON AIRFLOW DISTRIBUTION CHAMBER OF PNEUMATIC SEED METERING DEVICE
Using the pneumatic conveying metering technology, designed a seed-metering device with forming machine. The main work includes: the structure and working principle of metering de-vice for pneumatic conveying are expounded, carry out the dynamic analysis of flow distribution, using computational fluid dynamics software (CFD) on the flow field distribution of simulation analysis and optimize the structure parameters. The simulation results show that different blade structure parameters, which include the number, angle and arrangement order of blade have different effects on the internal flow field of the forming machine. The bench experiment of forming machine is used to verify the significance of the influence of different structural parameters and the optimal combination of parameters of the forming machine. The results showed that the filling and clearing ability of the 7-blade 10° forming machine is better than that of other groups of blade structure parameters. Increasing the angle of the blade (10° to 13°) has little effect on the flow rate difference between the filling area and the cleaning area. When the blade angles in the filling area are the same, the speed has nothing to do with the arrangement order of the blades, but the speed distribution of the cleaning area is related to the size of the blade at the end of the cleaning area. The experiment results show that when the blade size is reduced by half, the flow speed increases by about 18.9%.
Abstract in Chinese