泄洪洞工作闸室及陡坡明渠段体型优化数值模拟
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摘要
对九甸峡水电站右岸泄洪洞工作闸室,包括圆直段、圆变方段、方洞段、弧形闸门段、渐变段和明渠段流场进行了数值模拟。获得了水面线、压力、空化数、流速等水力要素。成功捕捉到了压力洞出口处的水翅、突扩跌坎处侧空腔和底空腔。计算结果与实测数据符合较好,根据计算结果,提出了能解决原方案负压区严重和明渠陡坡空蚀破坏问题的泄洪洞体型修改方案。
The numerical simulation of Jiudianxia hydropower station right bank spillway tunnel working chamber was carried out. The simulated area covers the working chamber of flood discharging tunnel,round-straight region,round changing square region,square hole region,tainter valve region,transition region,and open channel section. The obtained hydrodynamic characters include the depth of flow,pressure distribution,variation of cavitation,velocity distribution and the velocity distribution along the flood discharge tunnel. Water-wing,sudden enlargement drop-sill,side cavity and bottom of the cavity have been successfully obtained. Comparison between the numerical results and model test data shows a satisfactory agreement. Based on these results,some suggestions which can successfully solve the burden problems and the cavitation erosion have been proposed for the modification of the spillway tunnel.
The numerical simulation of Jiudianxia hydropower station right bank spillway tunnel working chamber was carried out. The simulated area covers the working chamber of flood discharging tunnel,round-straight region,round changing square region,square hole region,tainter valve region,transition region,and open channel section. The obtained hydrodynamic characters include the depth of flow,pressure distribution,variation of cavitation,velocity distribution and the velocity distribution along the flood discharge tunnel. Water-wing,sudden enlargement drop-sill,side cavity and bottom of the cavity have been successfully obtained. Comparison between the numerical results and model test data shows a satisfactory agreement. Based on these results,some suggestions which can successfully solve the burden problems and the cavitation erosion have been proposed for the modification of the spillway tunnel.
引文
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[3]刘小良,张朋鹤,王鑫.龙潭水库导流泄洪洞运行水力特性研究[J].水利与建筑工程学报,2015,13(4):159-161.
[4]廉玲军,王韦,徐威,等.洞塞泄洪洞的3维数值模拟研究[J].四川大学学报(工程科学版),2011,43(3):1-6.
[5]南洪,贺威,韩鹏辉,等.查日扣水电站竖井旋流泄洪洞水力学数值模拟研究[J].水利与建筑工程学报,2015,13(5):204-207.
[6]南洪,贺威,韩鹏辉,等.竖井旋流泄洪洞消力井深度对竖井消能率影响的数值模拟研究[J].水利与建筑工程学报,2014,12(5):133-136.
[7]葛晨,牛争鸣,李奇龙,等.泄洪洞内具有阻塞与扩散段的水平旋流消能方式水力特性的试验与数值模拟(2)[J].水力发电学报,2015,34(1):73-78.
[8]黄浩,张昌兵,幸智.二滩水电站1号泄洪洞水力特性与掺气减蚀的三维数值模拟[J].水资源与水工程学报,2011,22(6):168-170.
[9]武利龙,黄萌,陈斌.基于自适应非结构化网格的VOF方法[J].工程热物理学报,2011,32(11):1863-1865.
[10]吕绪明,徐一民,乔梁,等.泄洪洞突扩突跌掺气设施水力特性研究[J].中国农村水利水电,2015(8):152-157.
[11]马旭东,戴光清,杨庆,等.突扩突跌掺气射流对泄洪洞侧墙水力特性的影响[J].水力发电学报,2012,31(3):142-147.
[12]牛争鸣,南军虎,洪镝.一种新型掺气设施的试验研究[J].水科学进展,2013,24(3):372-378.
[13]张志学.新疆某水利枢纽工程底孔工作闸室体型优化设计[J].水利科技与经济,2013,19(8):62-64.
[14]张宏伟,刘之平,张东,等.高水头大流量泄洪洞侧壁掺气设施水力特性研究[J].水力发电学报,2015,34(10):111-116.
[15]张勇,刘韩生,汪洋,等.型窄缝挑坎在水电站导流泄洪洞中的应用[J].水资源与水工程学报,2015,26(4):149-152.