摘要
在以往水击随机分析中,摩阻按确定量考虑,其影响往往被忽略;而实际的水击过程中,摩阻为非恒定值,为一不确定量,文中研究非恒定摩阻对随机水击波动过程的影响。从水击的基本方程出发,分别建立了基于广义不可逆热力学理论的水击随机模型(EIT摩阻模型)与含有随机摩阻项的水击随机模型(随机摩阻模型),采用矩特征线法对水击过程进行数值模拟。算例表明,与采用恒定摩阻的水击随机分析比较,本文提出的两种随机模型在计算最大水击压力值的同时,可以模拟水击压力的波动过程,而且随机摩阻模型的数值计算更为简便。
In past studies of stochastic water-hammer analysis, the shear stress has been considered as steady friction, while it actually is unsteady friction. In this article, the effect of unsteady friction on the simulation of fluctuation process of water-hammer was studied. Moreover, the random models of water-hammer considering EIT friction and random friction were established and moment characteristic method was proposed for numerical calculation. Based on computational example results, it can been concluded that （i） both models are used for calculating the maximum piezometric head and simulating the fluctuation process of water-hammer and （ii） compared with EIT friction model, calculation of random friction model is more feasible and effective.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2009年第2期250-256,共7页
Chinese Journal of Hydrodynamics
基金
武汉大学水资源与水电工程科学国家重点实验室开放基金(2006B030)
关键词
水击
随机分析
EIT摩阻模型
随机摩阻模型
water-hammer
stochastic analysis
EIT friction model
random friction model
