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旋风分离清选适用于小型水稻联合收割机,在保证清选损失率小的前提下,降低含杂率是设计的关键。为探寻分离筒中气流和籽粒两相流动规律,选取水稻脱出物中谷粒、颖壳、瘪谷、杂穗等为研究对象,利用Fluent软件对4LZ-0.8型水稻联合收割机清选系统中的旋风分离清选装置进行三维数值仿真模拟,分析不同工况下清选模型中各组分籽粒的运动轨迹,计算其分离效率。并以低损试验条件下谷粒清洁率为主目标进行台架试验,对最优模型进行了试验验证,评价扬谷轮转速、吸杂风机转速和分离组件距入口高度三因素与装置清选性能之间的影响关系,通过建立回归模型,进行多目标优化求解,得到较优参数组合:当扬谷轮转速为1 163 r/min,吸杂风机转速为1 920 r/min,分离组件距入口高度为63.26 mm时,预测所得谷粒清洁率为99.26%,可为清选装置再设计提供参考。
Cyclone separation is suitable for small rice combine harvester, in ensuring the loss of small loss on the premise of the premise of reducing the impurity content is the key to the design. In order to explore the air flow and the two-phase flow law of grain in the separation cylinder, the grain, glume, deflated valley and hybrid spike were selected as the research objects. Fluent software was used to analyze the cyclone in 4LZ-0.8 rice combine harvester. Separation of the cleaning device for three-dimensional numerical simulation, analysis of different conditions in the clearance model of each particle movement trajectory, calculate the separation efficiency. The bench test was carried out with the grain cleaning rate under the condition of low loss test as the main objective. The optimum model was tested and the three factors of the speed of the winder, the speed of the suction fan and the inlet height of the separating assembly were evaluated. By establishing a regression model, the optimization of multi-objective solution is obtained, and the optimal combination of parameters is obtained: when the speed of the twister is 1 163 r / min and the speed of the suction fan is 1 920 r / min, When the height is 63.26 mm, the predicted grain cleaning rate is 99.26%, which can be used as a reference for the redesign of the cleaning device.