| 流体力学中的总流伯努利方程 |
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| 引用本文： | 严导淦. 流体力学中的总流伯努利方程[J]. 物理与工程, 2014, 0(4): 47-53 |
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| 作者姓名： | 严导淦 |
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| 作者单位： | 同济大学物理科学与工程学院; |
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| 摘 要： | 文章从宏观上分析流体的平衡和运动规律,着重阐述流体力学中理想流体和压强的概念以及静止流体内压强的分布规律.文章介绍了流体的定常运动及流线、流量和总流的概念,给出了连续性方程,并在此基础上推导了理想流体定常运动的总流伯努利方程.结合工程实际问题,文章还介绍了实际流体的定常流动的总流伯努利方程.
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| 关 键 词： | 压强 理想流体 流管 流线 总流 连续性方程 定常流动 渐变流 水头损失 雷诺数 层流、湍流 |
THE TOTAL FLOW BERNOULLI EQUATION IN FLUID MECHANICS |
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| Yan Daogan. THE TOTAL FLOW BERNOULLI EQUATION IN FLUID MECHANICS[J]. Physics and Engineering, 2014, 0(4): 47-53 |
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| Authors: | Yan Daogan |
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| Affiliation: | Yan Daogan (Physics Teaching and Research Section, Institute of Physical Science and Engineering, Tongji University, Shanghai 200092) |
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| Abstract: | This paper analyzed the balance and movement rules of fluid at a macro level, and focused on the concepts of ideal fluid and pressure in fluid mechanics as well as the multipoint pressure distribution in static fluid. In the article, we introduced the concepts of steady flow, stream line, stream tube, and total flow. Equation of continuity has been given, and on this basis, the Bernoulli equation for steady gross flow of ideal fluid has been derived. Combined with practical engineering problems, this paper also introduced the total Bernoulli equation of steady flow for the actual fluid. |
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| Keywords: | pressure ideal fluid stream tube stream line gross flow continuity equation steady flow gradually varied flow head loss Reynold＇s number laminar flow turbulence |
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