明渠恒定均匀流机械能损失构成分析

发布时间：2018-02-25 03:27

本文关键词： 矩形明渠恒定均匀流机械能损失构成流体力学紊动能耗散时匀流速梯度　出处：《长江科学院院报》2017年06期 　论文类型：期刊论文

【摘要】：明渠水流机械能损失的确定是水力学乃至工程流体力学中的重要内容。从明渠均质不可压缩液体恒定总流出发,以流体力学中黏性流体运动数学模型为基础,本质上揭示了机械能损失的构成和相互转化关系。成果表明:矩形明渠均匀流紊流的机械能损失由时均流速梯度引起的损失与紊动能耗散引起的损失组成,当雷诺数较小时,时均流速梯度引起的损失是机械能损失的主要来源,而雷诺数较大时,紊动能耗散引起的损失是机械能损失的主要来源。在宽浅明渠中,雷诺数约为9.5×103时,均流速梯度引起的损失和紊动能耗散引起的损失相等。
[Abstract]:To determine the open channel flow mechanical energy loss is an important content of hydraulics and engineering fluid mechanics. From the channel of an incompressible liquid constant total flow of viscous fluid motion in fluid mechanics based mathematical model, essentially reveal the composition of the mechanical energy loss and mutual transformation relationship. The results show that the rectangular open channel uniform flow the mechanical energy loss and turbulent turbulent loss by the mean velocity gradient caused by the dissipation caused by the loss, when the Reynolds number is small, the mean velocity gradient is caused by the loss is the main source of mechanical energy loss, and the Reynolds number is large, the turbulent energy dissipation caused by the loss is the main source of mechanical energy loss the text. In the wide ditch, the Reynolds number is about 9.5 * 103, the mean velocity gradient and the loss caused by the turbulent energy dissipation caused by the loss is equal.

【作者单位】：长江科学院水力学研究所;重庆交通大学内河航道整治技术交通行业重点实验室;长沙矿山研究院有限责任公司金属矿山安全技术国家重点实验室;
【基金】：国家重点研发计划项目(2016YFC0402004) 重庆交通大学内河航道整治技术交通行业重点实验室开放基金项目(NHHD-201507)
【分类号】：TV133

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