CAJ | 학술논문

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.
대우추수축능전참(PSPS)적란하대패상유영수면,유우수고수위주기성승강변화,회출현여수、기등불동개질접촉적교체변화현상. 장구유저충현상적영수패면변계칭지위특수변계. 저충교체변화적변계조건대특수변계표면급기영향범위내적온도장분포장산생교대적영향,재온도방진분석중불능홀략. 제출료고필특수변계영향적추수축능전참대패불은정온도장수평분구이보장해법,재분석특수변계특정적기출상,대수평분구이보장해법적기본원리진행료추도,병제출료등효방열계수적개념,종평균의의상근사고필표면혼응토여불동개질접촉시방열계수처우변화적문제,급출료수평분구계한적위치범위. 장해해법용우호화호특 PSPS 하수고란하패적불은정온도장적방진분석중. 결과표명,제출적방법시유효화성시적,병위계산경위복잡모시적온도응력장제공료가능. 최후,대엄한지구특수변계처가능출현적결빙여해동문제진행료초보탐토.
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 fieldof 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 thevariation 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.