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單旋翼植保無(wú)人機(jī)翼尖渦流對(duì)霧滴飄移的影響
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國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFD0200700),、廣東省自然科學(xué)基金項(xiàng)目(2017A030310383),、廣東省科技計(jì)劃項(xiàng)目(2016A020210100,、2017B010117010),、廣東省教育廳重點(diǎn)平臺(tái)及科研項(xiàng)目(2015KGJHZ007)和廣州市科技計(jì)劃項(xiàng)目(201707010047)


Influence of Wing Tip Vortex on Drift of Single Rotor Plant Protection Unmanned Aerial Vehicle
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    摘要:

    為研究單旋翼植保無(wú)人機(jī)翼尖渦流對(duì)霧滴飄移的影響特性,,基于格子玻爾茲曼(LatticeBoltzman, LBM)方法的自適應(yīng)細(xì)化物理模型,,對(duì)單旋翼無(wú)人機(jī)的旋翼流場(chǎng)進(jìn)行了數(shù)值模擬,。通過(guò)改變無(wú)人機(jī)噴桿的垂直距離和噴頭在旋翼下方的位置,,研究了不同飛行速度下,無(wú)人機(jī)翼尖渦流對(duì)霧滴飄移的影響規(guī)律,。為捕獲到不同粒徑的霧滴在無(wú)人機(jī)下洗流場(chǎng)中的運(yùn)動(dòng)軌跡,,采用基于拉格朗日離散相粒子跟蹤法模擬了霧滴的運(yùn)動(dòng)軌跡。為驗(yàn)證數(shù)值模擬的準(zhǔn)確性,,進(jìn)行了試驗(yàn)驗(yàn)證,,研究結(jié)果表明:當(dāng)無(wú)人機(jī)飛行速度大于3m/s時(shí),機(jī)身后方開(kāi)始出現(xiàn)螺旋型尾渦,且飛行速度越大,、飛行高度越高,,尾渦向機(jī)身后方的擴(kuò)散距離越遠(yuǎn);當(dāng)飛行速度為5m/s、飛行高度為3m時(shí),,38%的霧滴因螺旋尾渦而造成空中飄移,,其中粒徑小于100μm的霧滴約占總飄移霧滴數(shù)的80%;噴桿距離主旋翼的高度對(duì)霧滴因翼尖渦流造成的飄移影響不明顯,,但噴頭的位置越靠近主旋翼的邊緣,,霧滴越容易被翼尖渦流卷吸。

    Abstract:

    Plant protection drone has great application prospects in agricultural production due to its low working height, flexible operation, good adaptability to terrain, slight environmental pollution and high efficiency in pest control. However, it could cause secondary disasters with droplets drift due to wingtip vortices. To investigate the effect of wing tip vortex flow of a single-rotor unmanned aerial vehicle on droplet drift, the flow field under a singlerotor unmanned aerial vehicle (UAV) was simulated numerically based on an adaptive thinned physical model of the lattice-Boltzman (LBM) method. The drift characteristics at different flight speeds of the wingtip vortex were examined for various nozzle positions and vertical distances between different spray booms. The Lagrange discrete particle tracking method was applied to capture accurately the trajectories of droplets with different particle diameters. Spray tests were conducted to verify the accuracy of the numerical simulation. It was shown that as the UAV flight speed was greater than 3m/s, a spiral tail vortex appeared at the rear of the fuselage. The range of the tail vortex behind the fuselage became longer as the flight speed or flight altitude got higher. And 38% of the droplets was drifted by the spiral tail vortex at the flight speed of 5m/s and the flight height of 3m, in which 80% of the drifted droplets was smaller than 100μm. The distance between the sprayer and the main rotor had little effect on the drop drift caused by the wingtip vortex. While the nozzle was closer to the edge of the main rotor, the droplets can be more easily sucked by the wingtip vortex.

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文晟,韓杰,蘭玉彬,尹選春,盧玉華.單旋翼植保無(wú)人機(jī)翼尖渦流對(duì)霧滴飄移的影響[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2018,49(8):127-137,,160. WEN Sheng, HAN Jie, LAN Yubin, YIN Xuanchun, LU Yuhua. Influence of Wing Tip Vortex on Drift of Single Rotor Plant Protection Unmanned Aerial Vehicle[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(8):127-137,,160.

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  • 收稿日期:2018-03-16
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  • 在線發(fā)布日期: 2018-08-10
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