基于固液两相流模型的泥石流流速垂向分布研究

发布时间：2018-04-09 14:40

本文选题：泥石流　切入点：流速的垂向分布　出处：《水利学报》2017年02期

【摘要】：泥石流流速的垂向分布是泥石流运动理论中的核心问题之一。以固液两相流模型为基础,分析了泥石流中两相速度相等与不等条件下的本构关系和泥石流流速垂向分布的计算方法;在二维恒定均匀流的条件下,考虑两相之间的相互作用,推导层流和紊流流态下泥石流中液相和固相速度的垂向分布公式,并采用不饱和水石流的试验数据进行了验证。结果表明:泥石流两相之间的速度差异是描述两相之间相互作用的根本所在;泥石流固相浓度与本构关系中的模化参数均有关联,是流速垂向分布计算中的重要参量;基于两相流模型的泥石流流速垂向分布公式比现有公式更具普遍意义,且其计算结果能与试验数据较好吻合。
[Abstract]:The vertical distribution of debris flow velocity is one of the core problems in debris flow theory.Based on the solid-liquid two-phase flow model, the constitutive relation of two-phase velocity in debris flow and the calculation method of vertical distribution of debris flow velocity are analyzed, and the interaction between the two phases is considered under the condition of two-dimensional constant and uniform flow.The vertical distribution formulas of velocity of liquid and solid in debris flow under laminar and turbulent flow are derived and verified by the experimental data of unsaturated water and stone flow.The results show that the velocity difference between the two phases of debris flow is the fundamental to describe the interaction between the two phases, the solid concentration of debris flow is related to the modeling parameters in the constitutive relation, and it is an important parameter in the calculation of vertical velocity distribution.The vertical distribution formula of debris flow velocity based on two-phase flow model is more universal than the existing formula, and the calculated results are in good agreement with the experimental data.
【作者单位】：中国水利水电科学研究院泥沙研究所;流域水循环模拟与调控国家重点实验室;
【基金】：国家科技支撑计划项目(2013BAB12B02,2013BAB12B01) 国家国际科技合作专项(2015DFR70980)
【分类号】：P642.23

【相似文献】