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以吸盘式精密播种装置为研究对象,应用CFD技术数值模拟吸种盘不同吸孔直径、气源真空度和气吸室形状下气力吸种部件内气流的压力场,并进行试验验证。仿真结果表明:较大的吸孔直径可提高吸种能力,但气吸室内压力呈不均匀分布趋势,影响吸种性能;较大的气源真空度有利于提高吸种能力,且不影响气吸室流场的均匀分布;气吸室形状对吸种能力和吸种均匀性均不造成影响。试验分析与仿真分析结果一致。对于自制吸盘式精密播种装置,播种水稻种子时吸种盘上吸孔孔径2.0 mm左右、真空度为6.7~15.0 kPa时具有较好的吸种效果。
Taking the sucker-type precision sowing device as the research object, the CFD technique was used to simulate the pressure field of the airflow in the suction component with different suction hole diameter, air source vacuum degree and suction chamber shape. The simulation results show that the larger suction hole diameter can increase the suction capacity, but the pressure in the suction chamber presents a non-uniform distribution trend, which affects the suction performance. A larger vacuum degree of the air supply helps to increase the suction capacity without affecting the gas absorption The uniform distribution of the flow field in the suction chamber; the shape of the suction chamber has no effect on the suction capacity and suction uniformity. Experimental analysis and simulation results are consistent. For the self-made sucker precision sowing device, when the rice seeds were seeded, the sucking hole diameter on the sucking tray was about 2.0 mm, and the vacuum degree was 6.7-15.0 kPa, the sucking effect was good.