用于抽水蓄能电站大坝不稳定温度场仿真的水平分区异步长解法  

A Method Using Different Time Steps in Different Horizontal Regions for Simulation of Unsteady Temperature Field of Pumped Storage Power Station Dam

作　　者：孙伟[1] 何蕴龙[1] 王南[1] 熊堃 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]长江勘测规划设计研究有限责任公司,武汉430010

出　　处：《天津大学学报（自然科学与工程技术版）》2015年第9期817-826,共10页Journal of Tianjin University：Science and Technology

基　　金：中国博士后科学基金资助项目(2012M511594);国家大坝安全工程技术研究中心开放基金资助项目(NDSKFJJ1103)

摘　　要：对于抽水蓄能电站(PSPS)的拦河大坝上游迎水面,由于水库水位周期性升降变化,会出现与水、气等不同介质接触的交替变化现象.将具有这种现象的迎水坝面边界称之为特殊边界.这种交替变化的边界条件对特殊边界表面及其影响范围内的温度场分布将产生较大的影响,在温度仿真分析中不能忽略.提出了考虑特殊边界影响的抽水蓄能电站大坝不稳定温度场水平分区异步长解法,在分析特殊边界特征的基础上,对水平分区异步长解法的基本原理进行了推导,并提出了等效放热系数的概念,从平均意义上近似考虑表面混凝土与不同介质接触时放热系数处于变化的问题,给出了水平分区界限的位置范围.将该解法用于呼和浩特PSPS下水库拦河坝的不稳定温度场的仿真分析中.结果表明,提出的方法是有效和省时的,并为计算更为复杂耗时的温度应力场提供了可能.最后,对严寒地区特殊边界处可能出现的结冰与解冻问题进行了初步探讨.Because of the cyclical fluctuation of the water level of the reservoir, the upstream boundary of the pumped storage power station （PSPS）dam would encounter alternate contact with water, gas and other different me- dia. The upstream dam boundary with this kind of characteristics is called the special boundary. These alternating boundary conditions have a big impact on the distribution of the temperature field of special boundary surface and its impact range, and cannot be ignored in the temperature simulation analysis. This paper proposes a method of solving unsteady temperature field of pumped storage power station dam with different time steps in different horizontal re- gions, and analyzes in detail the characteristics of special boundary and gives the formula derivation of the basic principle of the method with different time steps in different horizontal regions. The concept of equivalent heat transfer coefficient is also put forward to averagely and approximately consider the variation of heat transfer coefficient when the surface concrete contacting with different media and the position of horizontal partitioning boundary is given as well. The method is used in the simulation analysis of unsteady temperature field of Hohhot PSPS reservoir dam. The results show that the proposed method is effective and provides the possibility of calculating the temperature stress field which is more complex and time-consuming. Finally, the paper tentatively discusses the problem of freezing and thawing at the special boundary in cold regions.

关 键 词：抽水蓄能电站 水平分区 异步长 不稳定温度场 等效放热系数 

分 类 号：TV697.2[水利工程—水利水电工程]