| 引用本文: | 陈雪丽,魏正英,马睿佳,等.灌溉输水管道沟槽减阻研究[J].灌溉排水学报,2018,37(3):90-95. |
| CHEN Xueli,WEI Zhengying,MA Ruijia,et al.灌溉输水管道沟槽减阻研究[J].灌溉排水学报,2018,37(3):90-95. |
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| 摘要: |
| 【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RNG k-?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RNG k-?湍流模型对灌溉输水管道开展了0.1~1 mm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，RNG k-?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RNG k-?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0.5 mm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s+=15.2,无量纲沟槽尺寸lg+=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%。 |
| 关键词: 灌溉管道； 沟槽减阻； 数值模拟； RNG k-?湍流模型 |
| DOI：10.13522/j.cnki.ggps.2016.0262 |
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| Research on Drag Reduction of Irrigation Delivery Pipeline |
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CHEN Xueli, WEI Zhengying, MA Ruijia, MA Shengli, MA Chao
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State Key Lab for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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| Abstract: |
| 【Objective】 Explore the drag reduction effect of riblet structure on the irrigation pipeline. 【Method】The drag reduction effect of the riblet in the turbulent flow was simulated by SA and RNG k-? turbulence model, and compared with the results of Bechert’s test, then the RNG k-? turbulence model was used to analyze the V-shaped riblet drag reduction at the scale of 0.1~1 mm for the irrigation pipeline, finally the LES turbulence model was used to explore the drag mechanism of the riblet structure. 【Result】 Compared with the SA turbulence model, the RNG k-? turbulence model had the smaller error compared with the Bechert’s test result, which was 4.6%, in other word, the RNG k-? turbulence model was more accurate. For a V-shaped riblet with the angle of 60°, when the riblet length was 0.5 mm, it had the best drag reduction effect on the irrigation pipeline, the drag reduction rate was 7.17%, corresponding to the dimensionless pitch s+ was 15.2, and dimensionless riblet size lg+ was 10. There were small vortices in the riblets that might be one of the causes of the drag reduction in the turbulence. 【Conclusion】 The best drag reduction effect of the V-shaped riblet with an angle of 60°for the irrigation pipelines was 7.17%. |
| Key words: irrigation pipeline; riblet drag reduction; numerical simulation; RNG k-? turbulence model |
