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灌溉输水管道沟槽减阻研究
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Journal Article
灌溉输水管道沟槽减阻研究
2018
Overview
【目的】探索沟槽结构对灌溉输水管道的减阻作用。【方法】采用SA与RNGk-e湍流模型。模拟分析了沟槽在湍流流动中的减阻效果，并与Bechert的试验结果进行了对比；采用RNGk-e湍流模型对灌溉输水管道开展了0．1～1mm尺度下的V形沟槽减阻研究；采用LES湍流模型对沟槽减阻机理进行了探索。【结果】①相较于SA湍流模型，lINGk-e湍流模型的计算结果与Bechert的试验结果相比误差更小，为4．6％，即RNGκ-ε湍流模型计算精确度更高；②夹角为60°的V形沟槽，当沟槽边长为0．5mm时对灌溉输水管道具有最佳减阻效果，减阻率为7．17％，对应无量纲沟槽间距r=15．2，无量纲沟槽尺寸l＋8=10：③沟槽中存在很小的涡旋，这些小涡旋可能是沟槽在湍流中具有减阻作用的原因之一。【结论】夹角为60。的V形沟槽对灌溉输水管道的最佳减阻效果为7．17％。
Publisher
Chinese Academy of Agricultural Sciences (CAAS) Farmland Irrigation Research Institute Editorial Office of Journal of Irrigation and Drainage
Subject
