折流坎高度对导流洞交汇段水力特性的影响
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摘要
针对竖井旋流泄洪洞与原导流洞交汇段后水流冲顶、流态紊乱的问题,结合某导流洞改建工程,通过水工模型试验,研究了不同高度折流坎对交汇段后水力特性的影响。结果表明,随着折流坎高度的降低,折流坎压强增大,最大压强均出现在上游侧;随着折流坎高度的降低,导流洞内的水流逐渐平顺;增设折流坎后,交汇段的局部水头损失降低了8.627%～15.063%,且折流坎高度降低,局部水头损失减小。综合考虑发现设计工况下体型d(折流坎高度约为1.05倍的来流水深)相对较优。研究结果可为类似工程提供参考。
In order to solve the problem that the flow top and flow state are disorder after the intersection section of the shaft swirling flood discharge tunnel and the original diversion tunnel,combined with a diversion tunnel reconstruction project,the influence of different height baffles on the hydraulic characteristics of the intersection section is studied through hydraulic model test.The results show that with the decrease of the height of the baffle,the pressure of the baffle increases,and the maximum pressure appears the upstream side.With the decrease of the height of the baffle,the flow in the diversion tunnel is smoother;The local head loss of the intersection section is reduced by 8.627%-15.063%;With decrease of the height of the baffle,the loss of the local head is smaller.It finds out that the baffle height fits relatively better in 1.05 times of the flow depth in design flux(shape d).The results can provide reference for the similar projects.
In order to solve the problem that the flow top and flow state are disorder after the intersection section of the shaft swirling flood discharge tunnel and the original diversion tunnel,combined with a diversion tunnel reconstruction project,the influence of different height baffles on the hydraulic characteristics of the intersection section is studied through hydraulic model test.The results show that with the decrease of the height of the baffle,the pressure of the baffle increases,and the maximum pressure appears the upstream side.With the decrease of the height of the baffle,the flow in the diversion tunnel is smoother;The local head loss of the intersection section is reduced by 8.627%-15.063%;With decrease of the height of the baffle,the loss of the local head is smaller.It finds out that the baffle height fits relatively better in 1.05 times of the flow depth in design flux(shape d).The results can provide reference for the similar projects.
引文
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[2]汪永怡,王韦,田忠,等.导流洞改建为洞塞式泄洪洞的体形优化研究[J].人民黄河,2009,31(5):113-115.
[3]牛争鸣,洪镝,谢小平,等.导流洞改建为旋流式内消能泄洪洞的研究和实践——以公伯峡水电站为例[J].水利水电科技进展,2007(1):36-41.
[4]何军龄.某工程竖井旋流泄洪洞水力特性研究[D].杨凌:西北农林科技大学,2017.
[5]何军龄,尹进步,蒋俏芬,等.超高水头大泄量竖井旋流泄洪洞的数值模拟研究[J].水力发电学报,2016,35(11):45-51.
[6]吕利,邓军,王晶,等.竖井旋流泄洪洞竖井壁面新型掺气方式试验研究[J].水力发电,2016,42(7):115-119.
[7]姚军.旋流竖井泄洪洞减压试验研究[J].四川水力发电,2015,34(6):184-187.
[8]王远明.竖井旋流式泄洪洞体型优化试验研究[D].哈尔滨:黑龙江大学,2010.
[9]杨磊,袁迪,郑静,等.阁壁水库溢洪道水流控制模型试验研究[J].水电能源科学,2010,28(6):69-71,169.
[10]刘善均,许唯临,王韦.高坝竖井泄洪洞、龙抬头放空洞与导流洞“三洞合一”优化布置研究[J].四川大学学报:工程科学版,2003(2):10-14.
[11]吴持恭.水力学(第四版上册)[M].北京:高等教育出版社,2003.