错排叶轮式排肥器设计与试验OA

In order to address issues such as bridging and ineffective discharge during the application of powdered biochar,a staggered impeller fertilizer applicator was designed.The primary factors influencing the fertilizer discharge rate were determined by constructing a mechanical model of the filling and discharge processes.The discrete element method(EDEM)was used to simulate the fertilizer discharge process,with the discharge rate as the evaluation index.A three-factor,three-level Box-Behnken experiment was conducted,considering the number of grooves,effective working length and rotational speed as influencing factors.The results showed that the order of influence of the factors on the discharge rate was rotational speed>number of grooves>effective working length.Among these,rotational speed had a highly significant effect,while the number of grooves had a significant effect.The optimal structural parameter combination was identified as 7 grooves,an effective working length of 50 mm,and a rotational speed of 62 r·min-1,yielding a fertilizer discharge of 33.132 g·s-1.To verify the simulation results for the effects of structural parameters on the fertilizer discharge of the staggered impeller fertilizer applicator,a bench test was conducted under the optimal structural parameter combination.The bench test results indicated the fertilizer discharge of 33.934 g·s-1,with a relative error of 2.36％compared to the simulation results.The simulation results were consistent with the bench test results.Above results provided theoretical reference for the application of powdered fertilizers.