叶片式抛送装置功耗试验研究与参数优化

为了提高全秸秆覆盖地免耕播种机作业质量,降低抛送装置的抛送功耗,采用Box-Benhnken中心组合试验方法对抛送装置的工作参数进行试验研究,以叶轮转速、物料含水率、叶片倾角等影响作业质量的3个因素进行三因素三水平响应面试验,建立响应面数学模型,分析各影响因素对作业质量的影响,同时,对影响因素进行综合优化。试验结果表明:各因素影响抛送功耗的显著顺序依次为叶轮转速、物料含水率、叶片倾角;最优工作参数组合为:叶轮转速1 600r/min、物料含水率63%、叶片倾角后倾9°,对应的比功耗919.89m~2/s~2,且各性能指标与理论优化值的相对误差均5%。研究结果可为抛送装置的结构完善设计和作业参数优化提供依据。

Parameter optimization and experiment for the power consumption of impeller-blower

In order to improve the quality of whole straw coverage with no tillage planter and reduce the throwing power consumption.Box-Benhnken central composite experimental design principle was adopted to study the working parameters of impeller-blower.Rotating speed,material moisture,vane slope angle were taken as three factors. Experiments on the three factors with three levels of response surface were conducted.A mathematical model of response surface was established.The influence of each factor on the working quality and optimize each factor comprehensively was analyzed.The results showed that the rotating speed,material moisture,vane slope angle in a decreasing order reduced power consumption significantly.The best model for comprehensive work parameters was set as following:when the rotating speed was 1 600 r/min,the material moisture was 63% and vane slope angle was 9°,the specific power consumption was 919.89 m²/s².Through comparing the mathematical model with the experimental result,it was discovered that the relative errors of all the property indices between these two were less than 5% indicating the model established was useful and could be used for predicting and optimizing.