《工程(英文)》 >> 2016年 第2卷 第3期 doi: 10.1016/J.ENG.2016.03.003
考虑射流掺气的改进冲刷模型
a Laboratory of Hydraulic Constructions (LCH), École polytechnique fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
b Civil Engineering Research and Innovation for Sustainability (CERIS), Instituto Superior Técnico, Universidade de Lisboa, Lisbon 1049-001, Portugal
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摘要
基于受高速射流冲击的水垫塘中掺气对岩块稳定性影响的系统试验研究,本文给出了一种基于物理特性冲刷模型的适应性研究成果。在综合冲刷模型中实现了对射流掺气模型的改进,使其得以再现有关冲刷形成的物理– 机械过程,其中涉及三相,即水、岩体和空气。改进方法考虑了因挟带气泡引起的掺气射流动量减少以及射流扩散剪切层的能量消耗。岩块从岩体脱离取决于掺气的时均压强系数及修正的最大动力冲击系数的组合,对于深水垫塘中的高速射流,该系数为定值0.2。上述改进模型的模拟结果与卡里巴大坝冲坑原型观测结果吻合良好。
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