基于数值模拟的水田刀片切泥制浆功率损耗分析

针对水稻稀泥育秧制浆机刀片切割泥浆过程中的功率损耗问题,运用Box-Benhnken design(BBD)中心组合方法对水田刀片参数进行了试验研究。根据折弯角、折弯高度、副刀角度3因素进行正交试验设计,建立3维响应面模型,分析了各因素对功率损耗的影响;同时采用数值模拟对水田刀片切割泥浆的作业过程进行仿真,并与泥浆槽实验结果对比分析。研究结果表明:①功率损耗影响显著性顺序为折弯高度>折弯角>副刀角度,其对功率损耗的贡献率分别为2.35、2.26、1.46;②在研究范围内,折弯角越大、折弯高度越小、副刀角度越小,越能够节省功率损耗;③泥浆槽试验与计算流体动力学商用软件模拟的均值误差为7.44%。

Power Consumption Analysis of Paddy Field Blades Cutting Mud Based on Numerical Simulation

For the power consumption during the cutting process of paddy field blades,this study used Box-Benhnken design(BBD)central combination method to test the parameters of paddy field blades,Orthogonal test design was based on three factors:Bending angle,Bending height and Angle of curved blade.The response surface model was established,and the influence of three factors on the power consumption was analyzed;At the same time,the numerical simulation was used to simulate the operation process of the blade cutting mud in the paddy field,and the results are compared with the results of the mud tank experiment.The results show that:1)The order of significant influence of power consumption in numerical simulation is Bending height>Bending angle>Angle of curved blade,whose contribution rates to power consumption are 2.35,2.26 and 1.46 respectively.2)In the research range,the larger the bending angle,the smaller the bending height,and the smaller the minor blade angle,the more power loss can be saved.3)The average error of the mud tank test and the computational fluid dynamics commercial software simulation is 7.44%.