内充气吹式油菜精量排种器气室流场仿真与试验

针对机械式排种器易发生堵塞造成漏播的问题,设计了一种内充气吹式油菜精量排种器。以ANSYS/CFX为工具建立气室流场仿真模型,以气室有无平衡出气孔为试验因素,对气室内气流场进行了仿真分析。仿真结果表明,有平衡气孔的气室压力波动比无平衡气孔小93 Pa。台架试验表明,无气吹作用、无平衡气孔气室气吹作用和有平衡气孔气室气吹作用3种状态下,漏播指数分别为14.4%、4.4%和2.4%,排种器的合格指数分别为66.8%、78.4%和82.0%,在气吹作用下排种器堵塞漏播问题得到明显改善。

Simulation and Experiment of Inside-filling Air-blow Precision Metering Device for Rapeseed

A prototype of inside-filling air-blow seed-metering device was developed to overcome the deficiency of mechanical precision metering device with high rate of cell blocked and seeds absent.Simulation analysis of flow in the prototype was carried out with software ANSYS/CFX.The simulation results showed that the pressure fluctuation in the prototype with stomata was fewer 93 Pa than it without stomata.The laboratory test results indicated that seeding performances of the seed-metering devices with stomata was much better than it without stomata: quality of feed index and miss index of the devices without air-blowing drop,with no-stomata air-blowing drop and with stomata air-blowing drop was 66.8%,78.4 %,82.0% and 14.4%,4.4%,2.4%,respectively.