CAJ | 학술논문

在某燃煤发电厂循环水取水系统模型试验研究的基础上，对泵站的前池和进水流道进行了三维湍流数值模拟。利用Fluent软件，选用雷诺平均N－S方程和标准k－ε湍流模型及SIMPLEC算法，模拟了在低潮位“两机四泵”这种最不利工况下的三维流场，给出了旋涡在最不利工况下的发生位置和形态，分析了可能造成的危害；在这种不利工况下，针对优化设计方案数值模拟中发现的涡及分布情况，调整导流扩散墩的布置，优化了流场形态，得出了比较合适的优化方案。
재모연매발전엄순배수취수계통모형시험연구적기출상，대빙참적전지화진수류도진행료삼유단류수치모의。이용Fluent연건，선용뢰낙평균N－S방정화표준k－ε단류모형급SIMPLEC산법，모의료재저조위“량궤사빙”저충최불리공황하적삼유류장，급출료선와재최불리공황하적발생위치화형태，분석료가능조성적위해；재저충불리공황하，침대우화설계방안수치모의중발현적와급분포정황，조정도류확산돈적포치，우화료류장형태，득출료비교합괄적우화방안。
With the development of rock mass engineering,more attention are paid to long-term security and stability of tunnels. In this pa-per,on the basis of in-situ monitoring results and numerical simulation of a diversion tunnel,furthermore combining with relaxation theories and creep characteristics of soft rock,we analyzed the stability of this engineering project. The results show that the deformation mainly oc-curs in the top-arch,and it follows by the rule of“significant period”to“slow deformation stage”,then to“stability”. And to the soft rock tunnel,we find out that the creep characteristic of soft rock has a significant influence on the results of numerical simulation. Meanwhile,a-dopting creep constitutive model,and combining with relaxation,we explicitly confirm that the thickness of relaxation-zone has an obviously effective on simulation precision.