Authors

Abstract

The value of high moisture content crops is higher and the planting area is wider. However, in the harvest process, due to the high moisture content, the cleaning loss is greater. In order to reduce the adhesion between the crop extraction mixture and improve the cleaning performance, a method of hot air cleaning was proposed. By using the fan design theory and thermodynamics, the prototype design of the hot air fan was completed. Through orthogonal test, the most suitable parameter combination is 1445r/min fan speed and 85℃ air inlet temperature. Computational fluid dynamics (CFD) was used to observe the air velocity and air temperature of the outlet under the optimal combination of parameters to check whether it meets the requirements of hot air cleaning. The reliability of numerical simulation was tested by bench test. Finally, a field experiment was carried out with the hot air fan to observe the difference between the cleaning effect and the fan under the optimal parameter combination, and compare the cleaning loss rate.

Abstract in Chinese

高含水率农作物的价值较高，种植面积较广。然而，在收获过程中，由于水分含量高，清选损失较大。为了减少农作物脱出混合物之间的粘附，提高清选性能，提出了热风清选方法。利用风机设计理论和热力学，完成了热气流风机的样机设计。通过正交试验，得出最合适参数组合为风机转速1445r/min，进风口风温85℃。采用计算流体力学(CFD)观察最佳参数组合下的出风口风速以及风温，检验其是否达到热风清选的要求。用台架试验检验数值模拟的可靠性。最后使用热气流风机进行田间试验，观察在最佳参数组合下的清选效果与普通风机的差别，并对比清选损失率。