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題名 | 單幫浦文氏管肥灌裝置之流量輸出性能評估=The Performance Evaluation of the Nutrient Injective Rate of Single Pump Venturi Fertigation Device |
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作者 | 陳令錫; | 書刊名 | 臺中區農業改良場研究彙報 |
卷期 | 134 2017.03[民106.03] |
頁次 | 頁1-9 |
分類號 | 434.25 |
關鍵詞 | 文氏管; 養液; 注入; 肥灌; Venturi; Nutrient; Injection; Fertigation; |
語文 | 中文(Chinese) |
中文摘要 | 單一離心幫浦構成的文氏管養液注入單元比雙幫浦構造簡單、成本較低;離心式幫浦在輸送灌溉水過程中的水壓,經過文氏管產生壓力差,構成養液注入功能,本研究目的為評估此架構下的養液注入性能。試驗結果顯示養液桶水位高度會影響養液輸出量,差異高達0.6 L/min,比三公升定量試驗之誤差值0.12 L/min為高。注入量穩定性試驗結果,各養液桶在1.0 L/min到3.0 L/min之間呈線性上升趨勢,表示此規格的文氏管養液注入單元在1.0~3.0 L/min範圍內各養液桶之輸出穩定性高,而且文氏管式養液注入單元之流量輸出誤差百分比小於4.5%,因此,該單幫浦文氏管式養液注入架構可以用於農業灌溉之養液調配應用,而操作使用上需注意選用底面積大高度差小的養液桶,減少養液桶水位高度對養液注入性能之影響。 |
英文摘要 | The single pump venturi fertigation device is simpler in the layout and cheaper than the double pumps system. The centrifugal pump builds water pressure in the pipeline during operation, and creates a pressure difference in the inlet and mixing port of venturi tube. Nutrients of stock solution tanks were injected into pipeline by this pressure difference. The aim of this study was to evaluate performance of the nutrient injective rate of the single pump venturi fertigation device. The nutrient injection rate was influenced by water level of stock solution, the flow rate difference reached 0.6 L/min, which was higher than the error of flow rate 0.12 L/min in the fixed 3 L/min injection test. The stability of nutrient injection rates were linearly increased between 1.0 L/min to 3.0 L/min, therefore, this type of venturi injection unit has flow rate error lower than 4.5% and high nutrients output stability in the range of 1.0 L/min to 3.0 L/min. Therefore, the single pump venturi fertigation device can be used to deliver nutrients and water to the root zone. In practical use, the stock solution tank with bigger bottom area and small height difference can reduce the effect of water level on the nutrient injection rate. |
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