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噴霧液滴撞擊大豆葉片表面研究
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國家自然科學(xué)基金資助項目(50975125)、江蘇省自然科學(xué)基金資助項目(BK2011048)、科技支疆計劃資助項目(2013BA044),、鎮(zhèn)江市科技支撐計劃資助項目(NY2012030)和江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項目(PAPD)


Impact of Spray Droplet on Soybean Leaf Surface
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    摘要:

    利用兩臺高速數(shù)碼攝像機對噴霧液滴撞擊大豆葉片表面過程和結(jié)果進行了測試與分析,。研究結(jié)果表明,產(chǎn)生沉積和回縮破碎兩種狀態(tài)時,液滴K值均小于57.7;發(fā)生噴濺時,大部分液滴K值大于57.7,,但由于葉片表面密被長柔毛使得液滴在低撞擊角度下易于噴濺,因此液滴在撞擊角度為28°和44°時K值小于57.7,。液滴在沉積過程中,,在相同粒徑和撞擊角度下,液滴撞擊速度越高最大鋪展越大,,鋪展時間也越長,,但撞擊速度高和撞擊速度低的液滴最終鋪展比接近。沉積部位對液滴鋪展過程和結(jié)果有重要影響,。液滴在回縮破碎過程中,,在表面張力的回縮和葉片表面的粘滯作用下分離破碎,,與沉積于葉片表面的液滴相比較,液滴收縮破碎后合計最終鋪展比大大提高,,均勻破碎的液滴其合計最終鋪展比比不均勻破碎的液滴大,。當(dāng)撞擊We數(shù)較高時,噴濺液滴將呈現(xiàn)噴射成串小液滴的狀態(tài),;當(dāng)撞擊We數(shù)較低時,,噴濺液滴將呈現(xiàn)噴射單獨的2~3個大液滴的狀態(tài)。噴射出成串小液滴后的液滴主體部分最終鋪展比比噴射出單獨大液滴后的液滴主體部分大,。

    Abstract:

    This study used two high speed digital cameras to test and analyze the process and result of spray droplet impact on the soybean leaf surface. The result showed that when spray droplets were deposited and rebound broken, K values were less than 57.7. When splashing, K values of the most droplets were more than 57.7 because of the dense pilose of the leaf surface. The droplets were splashed easily at a low impact angle. K values were less than 57.7 when impact angles were 28° and 44°. Considering the same particle size and impact angle in the deposited droplets, the maximum spreading increased and the spreading time prolonged with increasing impact velocity. The final maximum spreading ratio of the high impact velocity was close to the low impact velocity. Deposit locations significantly influenced the process and result of the droplet spreading. In the process of receding break up, the droplets separated and were broken under the rebound action of the surface tension and viscosity of the leaf surface. Compared with the droplets deposited on the leaf surface, the total final maximum spreading ratio of the droplets enlarged greatly after receding break up. The total final maximum spreading ratio of uniform droplets was larger than that of nonuniform droplets. When Weber number (We) of the impact was high, the spray droplets appeared as a series of small droplets. When We was low, the spray droplets appeared as two to three large droplets. The final maximum spreading ratio of the main body of the droplets after spraying a series of small droplets was larger than that when individual large droplets are sprayed.

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賈衛(wèi)東,朱和平,董祥,薛飛.噴霧液滴撞擊大豆葉片表面研究[J].農(nóng)業(yè)機械學(xué)報,2013,44(12):87-93,113. Jia Weidong, Zhu Heping, Dong Xiang,Xue Fei. Impact of Spray Droplet on Soybean Leaf Surface[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(12):87-93,113.

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  • 在線發(fā)布日期: 2013-12-05
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