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在有压管道水击计算中,传统准恒定摩阻模型不能准确描述快速瞬变流动过渡过程。该文介绍在快速瞬变流数值模拟中应用最为广泛的两类非恒定摩阻模型:物理理论基础模型和准恒定流经验修正模型,前者以引入历史速度权函数为特点,后者考虑非恒定流加速度对摩阻项的影响。该文比较了两类非恒定摩阻模型的优缺点、适用范围以及研究发展方向和待解决问题等,得出的结论是物理理论基础模型对于快速瞬变层流过渡过程有较好的应用性;经验修正模型则适用于高Re紊流快速瞬变过渡过程。
In the calculation of pressurized pipe water hammer, the traditional quasi-constant friction model can not accurately describe the rapid transient flow transition process. This paper introduces two kinds of non-stationary friction models which are most widely used in the numerical simulation of fast transient flow: the basic theoretical model of physics and the empirical correction model of quasi-constant flow, the former is characterized by introducing the historical speed weight function, the latter considering unsteady friction Effect of Flow Acceleration on Friction Resistance. In this paper, the advantages and disadvantages of two kinds of non-constant friction models are compared, their applicable scopes, research directions, problems to be solved and so on. The conclusions drawn are that the basic theoretical model of physics has good applicability for fast transient laminar flow transition ; Empirical correction model is suitable for high-Re turbulence transient transient process.