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扇形霧噴頭霧滴飄失機(jī)理
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國家高技術(shù)研究發(fā)展計(jì)劃（863計(jì)劃）資助項(xiàng)目（2008AA100904）;國家自然科學(xué)基金資助項(xiàng)目（30800728、30971940）


Drift Mechanism of Flat Fan Nozzle
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    摘要:

    為了分析霧滴飄失機(jī)理和提出針對性的防飄措施，使用相位多普勒粒子分析儀（PDPA）對常規(guī)扇形霧噴頭霧化產(chǎn)生的噴霧扇面中的霧滴粒徑與運(yùn)動(dòng)速度分布進(jìn)行了分析。結(jié)果表明：噴霧截面上霧滴體積中值直徑（VMD）分布為中間低、邊緣高的凹面形態(tài)，在噴霧扇面橫向和縱向?qū)ΨQ面上，VMD形態(tài)呈二次多項(xiàng)式分布；易飄失霧滴主要集中在距離噴頭300~500mm噴霧扇面的中心位置；噴霧扇面截面上的夾帶氣流速度符合高斯分布，氣流分布與空氣淹沒射流類似；噴霧扇面中易飄失區(qū)域是噴霧扇面末端、噴霧扇面兩翼、噴霧扇面迎流面外層。

    Abstract:

    In order to research the drift mechanism and develop effective anti-drift technology, phase Doppler particle analyzer (PDPA) was used to analyze droplets size and velocity distribution in spraying fan near flat fan nozzles. Results showed that the distribution of droplets size (VMD) in spraying fan sectional view was like a concave, and droplets size varied following quadratic polynomial in cross-symmetry plane and lengthwise-symmetry plane of spraying fan. Droplets drifting easily were located in the 300~500mm of the centre of spraying fan far from nozzles. Entrained air velocity in spraying fan varied following Gauss distribution, and the flow field of entrained air was similar to a submerged air jet. Major drifting areas were evaluated depending on the droplets size and velocity distribution in spraying fan. Results showed that there were three major drifting areas in spraying fan: cross edges of spraying fan, wake region of spraying fan and outer layer facing wind of spraying fan.

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宋堅(jiān)利,劉亞佳,張京,何雄奎,曾愛軍,Herbst A.扇形霧噴頭霧滴飄失機(jī)理[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2011,42(6):63-69. Song Jianli, Liu Yajia, Zhang Jing, He Xiongkui, Zeng Aijun, Herbst A. Drift Mechanism of Flat Fan Nozzle[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(6):63-69.

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