CAJ | 학술논문

运用基于流体体积(VOF)法的三维k-ε双方程紊流模型模拟了无压引水隧洞水气两相流紊流流场,近壁面采用考虑糙率影响的壁函数法进行处理.以某复杂长距离无压引水隧洞的输水过程为例,模拟了3种方案的断面平均过水面积、流量、流速和气压的变化,实现了多方案的比选.结果表明,3种方案水流均能顺利通过隧洞;方案二水流到达隧洞出口的时间最短;方案二的断面平均过水面积、流量、流速和气压均优于方案一;方案三与方案二差别较小,综合考虑过流能力及成本因素,方案二为最优方案.通过与某水库放水兼放空洞水深实测数据及采用传统水力学方法计算的经验值的对比分析,平均相对误差分别为5.01%和0.96%,验证了模型的可靠性.
운용기우류체체적(VOF)법적삼유k-ε쌍방정문류모형모의료무압인수수동수기량상류문류류장,근벽면채용고필조솔영향적벽함수법진행처리.이모복잡장거리무압인수수동적수수과정위례,모의료3충방안적단면평균과수면적、류량、류속화기압적변화,실현료다방안적비선.결과표명,3충방안수류균능순리통과수동;방안이수류도체수동출구적시간최단;방안이적단면평균과수면적、류량、류속화기압균우우방안일;방안삼여방안이차별교소,종합고필과류능력급성본인소,방안이위최우방안.통과여모수고방수겸방공동수심실측수거급채용전통수역학방법계산적경험치적대비분석,평균상대오차분별위5.01%화0.96%,험증료모형적가고성.
Based on volumn of fluid (VOF) method,the k-ε turbulence model was used to simulate the 3D water-air two-phase flow for free-flow tunnel. The wall function was applied near tunnel wall. Take the water delivery process of a complex long-distance free-flow tunnel as an example,the average flow area,discharge,velocity,and pressure of flow area were ob-tained to optimize the schemes. The results show that water can across the tunnel for each scheme. The time across the tunnel of the second scheme is the shortest and the results are superior to those of the first one. The characteristic of the third one is similar to those of the second one. The second scheme is chosen as the optimal one considering flow capacity and cost. The reliability of proposed model is verified by the data of the water depth in the drainage and emptying tunnel of a reservoir as well as the experimental result using hydraulic method. The average relative errors are 5.01% and 0.96% respectively.