弯道出流横向流速发展过程的解析解  

An Analytical Solution of Transverse Velocity in Straight Open Channel Situated Downstream of a Bend

作　　者：周建银[1] 邵学军[1] 假冬冬[2] 杨研[1] 秦翠翠[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,南京210029

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第7期583-588,共6页Journal of Tianjin University：Science and Technology

基　　金：国家科技支撑计划资助项目(2012BAB05B01);国家自然科学基金重点资助项目(51039004)

摘　　要：针对现有弯道出流横向流速衰减公式忽略横比降的局限,推导了考虑横比降影响的出弯直道内横向流速发展的解析解.该解析解的各项具有明确的物理意义.与试验数据对比表明,该解析解能够较为合理地预测出弯后直段内横向流速的发展,计算结果优于未考虑横比降的公式.横比降对直段的影响主要集中在靠近弯道的直段入口和出口.当横比降影响较大时,不考虑横比降的公式计算值与实测值相差较大,而考虑横比降的解析解的计算结果与实测符合得较好.Flow in a straight open channel situated downstream of a bend was considered. An analytical solution of transverse velocity in the channel was derived, and the effect of transverse slope was taken into account while it had been ignored in the existing formulae. Each term of the solution has a clear physical meaning. Verification shows that this analytical solution is capable of predicting the transverse velocity. Comparison between the proposed solution and an existing formula, which ignores the transverse slope, shows that the former is better. The entrance and exit parts of the straight channel are most affected by the transverse slope. When the effect of transverse slope is remarkable, the formula without consideration of transverse slope shows a great discrepancy from the experiment data, while the performance of the proposed analytical solution is generally good.

关 键 词：解析解 弯道出流 横向流速 过渡段 横比降 

分 类 号：TV143[水利工程—水力学及河流动力学] TV147