本文關(guān)鍵詞： 排種器 孔型 仿真 FLUENT 氣流場 播種效率　出處：《黑龍江八一農(nóng)墾大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：氣吸式精密播種機(jī)是一種先進(jìn)播種裝置,以播種效率高、不傷種、不限制種子的大小和形狀等優(yōu)點(diǎn)一直被國內(nèi)外學(xué)者廣泛研究,但目前國內(nèi)的氣吸式播種機(jī)發(fā)展速度慢,且作業(yè)效率低。為了提高國內(nèi)播種機(jī)的播種效率,需要優(yōu)化播種機(jī)性能,提高其播種性能。排種器是氣吸式播種機(jī)上的重要的部件,排種器的質(zhì)量直接影響著播種機(jī)的性能,本文以眾榮農(nóng)機(jī)公司的2BM-4型播種機(jī)為例,結(jié)合了播種機(jī)的排種器的特點(diǎn),借助FLUENT軟件對排種器吸種孔建立仿真模型,分析內(nèi)部流場變化情況,找出最優(yōu)組合,降低漏播率與重播率,為提高播種機(jī)的播種性能提供參考依據(jù)。本課題就不同孔型、不同孔徑和不同導(dǎo)程排種器的吸孔氣流場的變化進(jìn)行探究,根據(jù)FLUENT模擬結(jié)果得知:直孔、錐形孔和沉孔三種吸種孔相比,錐形孔的吸種效果最好;3.4mm、4.4mm、5.4mm的三種孔徑相比,5.4mm的孔徑吸孔效果最好,但是吸種孔的直徑設(shè)計(jì)要與種子的尺寸相匹配,所以4.4mm的吸種孔孔徑符合孔徑的設(shè)計(jì)要求,吸種效果最好;2mm、3mm、4mm三種導(dǎo)程相對比,2mm的導(dǎo)程吸種效果最好。將試驗(yàn)所得的結(jié)果進(jìn)行田間播種試驗(yàn),試驗(yàn)結(jié)果為:排種盤吸孔導(dǎo)程2mm,孔徑4.4mm的錐形孔的田間播種合格率為97.5%,吸種孔導(dǎo)程1mm,孔徑4.2mm的直孔田間播種合格率為98.8%。經(jīng)以上數(shù)據(jù)分析可知,FLUENT模擬分析試驗(yàn)結(jié)果可靠。
[Abstract]:The air-sucking precision seeder is an advanced seeding device, which has been widely studied by domestic and foreign scholars because of its advantages of high seeding efficiency, no damage to seeds and no restriction on the size and shape of seeds, but at present the speed of development of air-sucking seeding machines in China is slow. In order to improve the seeding efficiency of domestic planters, it is necessary to optimize the performance of seeder and improve its seeding performance. The seeding device is an important part of air-sucking seeder, and the quality of seeding device directly affects the performance of seeding machine. In this paper, taking the 2BM-4 seeder of Zhongrong Agricultural Machinery Company as an example, combining the characteristics of the seeder's seeding device, using FLUENT software to establish the simulation model of the seed sucking hole of the seeder, analyzing the variation of internal flow field and finding out the optimal combination. In order to improve the seeding performance of the seeder, the paper probes into the change of the air flow field of the suction hole in the different hole type, different aperture and different lead range. According to the FLUENT simulation results, it is known that the air flow field of the suction hole is straight hole. Compared with the three kinds of seed sucking holes, the seed suction effect of conical hole is better than that of 5.4mm hole, but the diameter design of seed suction hole should be matched with the size of seed, and the diameter of seed suction hole is better than that of 5.4mm hole with 3.4mm or 4.4mm hole, but the diameter of seed hole should be designed to match the size of seed. Therefore, the diameter of 4.4mm seed suction hole accords with the design requirements of the aperture, and the best seed suction effect is 2mm / 3mm / 4mm compared with 2mm / 4mm. The results were as follows: the qualified rate of field seeding of conical hole with diameter of 4.4 mm was 97.5mm, that of seed suction hole was 1 mm, and that of straight hole with diameter of 4.2 mm was 98.8.The result of above data analysis showed that the result of simulation analysis of fluent was reliable.
【學(xué)位授予單位】：黑龍江八一農(nóng)墾大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S223.2

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