多因素影响的梯形明渠三维流动规律
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TV131. 4

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国家自然科学基金,“土壤重金属迁移分数阶导数模型的机理分析和参数确定”,2020.1-2023.12,项目批准号:11972148。


Study on the law of three-dimensional trapezoidal open channel flow influenced by multiple factors
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    为了研究了梯形明渠三维流动规律,本文使用CFD软件Fluent的Realizable k - ε模型对梯形明渠进行了模拟。首先,数值模拟了边坡坡度比为1,流速为1m·s-1条件下的三维流动。数值结果表明对称面上流速的沿程变化不显著,底区流速满足对数律分布,外区流速用乘幂公式拟合有一定的误差。其次,本文分析了同一高度横向各点的速度值、静压、总压的沿程变化,壁面上不同高度切应力、总压的沿程变化和出入口的总压差。最后,本文考察了8种不同坡度、8种不同流速情况下边壁、床面的切应力、总压的变化趋势,得到了切应力和总压随流速的计算公式,揭示了梯形明渠的流动规律。

    Abstract:

    In order to explore the law of three-dimensional trapezoidal open channel flow, the Realizable k - ε model of CFD software fluent was used to stimulate it. Firstly, three-dimensional flow with the condition of the slope ratio valuing 1 and velocity valuing 1 m?s-1 was analyzed. The results show that there is no significant change of velocity along the flow path in the plane of symmetry. The velocity distribution in the bottom region satisfies the logarithmic law, but a certain deviation exists in the outer zone with the power formula fitting of the velocity. Secondly, the variations of velocity, static pressure and total pressure at several transverse points of the same height were analyzed along the flow path in this paper. The variations of the shear stress and the total pressure of different heights on the wall and the total pressure differences at the inlet and outlet were also investigated. Lastly, the variation trends of wall shear stress and total pressure on the wall and bed under 8 different slopes and 8 different flow rates were explored. The law of trapezoidal open channel flow is revealed with obtaining formulas for calculating shear stress and total pressure with flow rate.

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白伦,吴永婷,孙洪广. 多因素影响的梯形明渠三维流动规律[J]. 科学技术与工程, 2021, 21(11): 4600-4606.
Bai Lun, Wu Yongting, Sun Hongguang. Study on the law of three-dimensional trapezoidal open channel flow influenced by multiple factors[J]. Science Technology and Engineering,2021,21(11):4600-4606.

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  • 收稿日期:2020-08-25
  • 最后修改日期:2021-01-21
  • 录用日期:2020-12-21
  • 在线发布日期: 2021-05-17
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