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Provedor de dados:  Taiwan Agricultural Research Institute
País:  Taiwan
Título:  氣流屏蔽式施藥系統之設計評估
Design Evaluation of Pneumatic Shielded Spraying System
Autores:  蔡致榮
H. Erdal Ozkan
Jyh-Rong Tsay;H. Erdal Ozkan
Data:  1998-03
Ano:  1998
Palavras-chave:  氣流屏蔽 施藥系統 設計評估 CFD FLUENT Pneumatic shielded
Spraying system
Design evaluation
CFD
FLUENT [[classification]]8
Resumo:  [[abstract]]噴霧飄移乃農藥使用者與施藥地區民眾關心噴藥作業之焦點,而噴霧屏蔽之使用已成為減低噴霧飄移推薦策略中之一項技術,儘管許多研究已顯示機械式屏蔽對噴霧飄移之減低有正面效果,然而仍少有氣流屏蔽使用之資料,本研究中使用電腦流體動力模擬軟體FLUENT,基於比較飄移減低效果而進行氣流屏蔽式噴藥系統之設計評估,為便於相對比較,使用噴頭之傳統噴霧、氣輔噴霧與擬氣流剪切噴霧也包括於此模擬研究中。本研究所得之主要結論如后,並非所有氣流屏蔽之模擬情形皆可提供良好之飄移控制,為確保較佳之飄移減低效果並減少氣流屏蔽所需之功率需求,主要變數之最適操作參數經多因子變方分析選定為氣流速度40m/s、單位長度氣流流量1.7m3/s/m 以及氣流角度15度,其與某些有關氣輔噴霧與氣流剪切噴霧之前人研究結果相當吻合。除了氣輔噴霧與擬氣流剪切噴霧外,具氣流速度大於40m/s、單位長度氣流流量大於1.7 m3/s/m,以及氣流角度為15度之氣流屏蔽噴霧頗有希望成為減低噴霧飄移之另類技術。

[[abstract]]Spray drift is a major concern for users of pesticides as well as people who live in areas where pesticides are sprayed. Using spray shields has been among the strategies recommended for reducing spray drift. Even though many studies pertaining to mechanical shields had shown positive effect on reducing spray drift, little information about the use of pneumatic shields was available. In this study, the design evaluation of pneumatic shielded spraying system based on comparing effects on drift reduction was conducted by using a computational fluid dynamic software, FLUENT. For purpose of relative comparisons, conventional spraying using nozzles, air-assisted spraying and air-shear spraying were also included. Main conclusions drawn from this study were as follows. Not all simulated cases of pneumatic shielded spraying provided better drift control. To ensure a better drift reduction and reduce the power required for pneumatic shielded spraying, the optimal operating parameters for the dominant variables appeared to be jet velocity of 40 m/s, jet flow rate of 1.7 m3/s/m, and jet angle of 15 degrees. The optimal operating parameters obtained from a multifactor analysis of variance conforms with some previous studies about air-assisted spraying and air-shear spraying. Except air-assisted spraying and pseudo air- shear spraying, pneumatic shielded spraying with jet velocity larger than 40m/s, jet flow rate larger than 1.7m3/s/m and jet angle of 15 degrees might be a promising alternative to reduce spray drift.
Idioma:  zh_tw
Identificador:  [[issn]]0376-477X

[[uri]]http://210.69.150.18:8080//handle/345210000/580
Relação:  華農業研究 47(1): 71-94
Journal of Agricultural Research of China 47(1): 71-94
Formato:  [[extent]]7255468 bytes

[[mimetype]]application/pdf
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