中文摘要：

在在不同分泌物比率和连接角度的条件下面的汇合的曲流拐弯隧道的流动模式数字地借助于大旋涡模拟(LES ) 被模仿，并且流动分离地区的特征被分析。数字结果被试验性的数据很好与一个好协议验证。垂直监禁的分析证明在分离地区以内的骚乱能作为 quasi-2-D 被描绘。分离地区特征的详情是由吝啬的速度 isolines 出现被披露。根据数字结果的分析，长度和分离地区的宽度通常随分泌物比率和连接角度的增加增加。然而，当连接角度从到 60 敲獳稠湯 ? 敢睴敥 ? 桴 ? 業楸杮氠祡牥愠摮琠敨栠杩 ? 瑳敲獳爠来潩 ? 湩琠敨眠污 ? 潢湵慤祲氠祡牥增加时，分离地区的宽度保持实质地不变

英文摘要：

The flow pattern in the confluent meander bend channel under the conditions of different discharge ratios and junction angles is numerically simulated by means of the large eddy simulation（LES）, and the characteristics of the flow separation zone are analyzed. Numerical results are well validated by experimental data with a good agreement. Analysis of the vertical confinement shows that the turbulence within the separation zone can be characterized as quasi-2-D. Details of the separation zone characteristics are revealed as shown by mean velocity isolines. According to the analysis of numerical results, the length and the width of the separation zone generally increase with the increase of the discharge ratio and the junction angle. However, the width of the separation zone keeps substantially constant when the junction angle increases from 60 o to90o. The dimensionless shape of the separation zone is nearly the same for three discharge ratios and three junction angles. The formulas of the relative width and the relative length of the separation zone are obtained by means of the polynomial fit method.