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首页> 外文期刊>Aspects of Applied Biology >Comparison of sampling arrangements to determine airborne spray profiles in wind tunnel conditions.
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Comparison of sampling arrangements to determine airborne spray profiles in wind tunnel conditions.

机译：比较在风洞条件下确定机载喷雾轮廓的采样安排。

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摘要

Many previous studies aimed at quantifying the risk of drift from boom sprayers have used airborne spray profiles measured in wind tunnel conditions and based on either a vertical profile at a distance of 2.0 m downwind or a horizontal profile measured immediately above the tunnel floor at distances up to 7.0 m from a single nozzle. Although some correlation between parameters derived from these two types of measurement has been demonstrated for defined types of nozzle, it is likely that no generalised relationship exists between the two approaches. As part of work to classify the performance of agricultural spray nozzles, it has been proposed that a single measure of drift risk should be used based, if possible, on a combination of the two types of measurement. Making detailed measurements of airborne flux at different distances and different heights in wind tunnel experiments could involve large numbers of samplers and hence relatively high costs. The study reported in this paper examined the sensitivity of the combined vertical and horizontal flux profiles measured in standardised wind tunnel conditions with a range of nozzle types and spray liquids to the number and arrangement of passive sampling lines used in the tunnel. The results showed that for the conditions used in the study, a two dimensional drift surface could be determined based on twelve passive sampling lines deployed downwind from a single nozzle. Methods of linking this drift surface to established measures of drift risk are presented together with methods by which such results can be interpreted.
机译：以前许多旨在量化喷杆式喷雾器漂移风险的研究都使用了在风洞条件下测量的机载喷雾剖面，并基于下风向2.0 m处的垂直剖面或在距井底较近距离处垂直测量的水平剖面从单个喷嘴到7.0 m。尽管已针对定义的喷嘴类型证明了从这两种类型的测量得出的参数之间的某些相关性，但两种方法之间可能不存在广义关系。作为对农业喷嘴性能进行分类的工作的一部分，有人提出，如果可能的话，应基于两种测量方法的组合使用单一的漂移风险度量。在风洞实验中对不同距离和不同高度的空气传播通量进行详细测量可能需要大量采样器，因此成本较高。本文报道的研究检查了在标准风洞条件下使用一系列喷嘴类型和喷雾液体测得的垂直和水平通量组合曲线对隧道中使用的被动采样管线的数量和布置的敏感性。结果表明，对于研究中使用的条件，可以基于从单个喷嘴顺风部署的十二条被动采样线确定二维漂移面。提出了将该漂移表面与已建立的漂移风险度量联系起来的方法，以及可以解释此类结果的方法。

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