摘要
为增加水稻钵体的抛出速度,提高落秧率,针对水稻钵体被机载水稻抛秧装置顶出脱盘后的运动状态,进行导苗机构的设计。通过建立计算流体力学(CFD)的离散相模型(DPM),对钵体颗粒的运动轨迹进行追踪研究,并对导苗机构内腔的流速和压力分布进行分析,得出气相的分布特点和原因。选取导苗机构入口速度、折弯角度和管长作为试验因素,以抛出速度为指标,进行仿真试验和响应面分析,模拟钵体颗粒在流场内的耦合情况进行抛秧管末端处颗粒抛出速度的数据分布监测,得出影响抛出速度的因素主次关系为折弯角度>入口风速>管长,最优参数组合为入口风速25 m/s、折弯角度6°、管长612 mm,此时钵体颗粒的抛出速度为19.8 m/s。通过对带苗钵体在导苗机构的运动情况进行实际验证,测得10组试验平均抛出速度为17.3 m/s,与仿真试验误差为12%左右,证明仿真试验的最优参数组合可行,满足设计要求。研究成果可为机载水稻抛秧装置的研究提供设计依据和理论参考。
In order to increase the throwing speed of rice bowl and improve the rate of dropping rice seedlings,the design of guiding rice seedlings mechanismwas carried outfor the movement state of the rice bowl after it was threw from the tray by the airborne rice seedling throwing device.By establishing the Discrete Phase Model(DPM)of Computational Fluid Dynamics(CFD),the movement of the particles in the bowl was tracked.The flow velocity and pressure distribution in the inner cavity of the seedling guide mechanism were analyzed,and the distribution characteristics and causes of the gas phase were obtained.The simulation test and response surface analysis were carried out with the inlet velocity,bending angle and tube length of the seedling guide mechanism as the test factors,and the throwing speed as the index.The data distribution of the particle ejection velocity at the end of the throwing tube was monitored by simulating the coupling of the bowl particles in the flow field.It was concluded that the primary and secondary factors affecting the throwing speed were bending angle>inlet wind speed>tube length.The optimal parameter combination was inlet wind speed of 25 m/s,bending angle of 6°,and tube length of 612 mm.At this time,the throwing speed of the bowl particles was 19.8 m/s.By the experimental verification of the movement of the seedling bowl in the seedling guide mechanism,the average throwing speed of the 10 groups of experiments was 17.3 m/s,and the error with the simulation test was about 12%.It was proved that the optimal parameter combination of the simulation test was feasible and met the design requirements.The research results could provide design basis and theoretical reference for the research of airborne rice seedling throwing device.
作者
葛宜元
郭宁宁
齐庆龙
孟庆祥
高洪才
Ge Yiyuan;Guo Ningning;Qi Qinglong;Meng Qingxiang;Gao Hongcai(School of Mechanical Engineering,Jiamusi University,Jiamusi 154007,China;Jiamusi Agricultural Technology Research Institute Co.,Ltd.,Jiamusi 154000,China)
出处
《农机化研究》
北大核心
2025年第12期250-257,共8页
Journal of Agricultural Mechanization Research
基金
中央引导地方科技发展专项(ZYYD2022JMS005)
新一轮黑龙江省“双一流”学科协同创新成果建设项目(LJGXCG2022-128)
黑龙江省创新团队项目(2021-KYYWF-0639)
黑龙江省教育厅基本科研业务费项目(2022-KYYWF-0590)
企业委托横向项目(20230718002)。
关键词
水稻
导苗机构
计算流体力学
离散相模型
rice
seeding guiding mechanism
computational fluid dynamics
discrete phase model
