阿尔塔什水库坝前冲刷漏斗模型试验研究
发布时间：2018-08-17 18:01
【摘要】：为了保持电站“门前清”、减少粗沙过机以及防止坝前闸门淤堵，应对电站进水口前的冲沙漏斗形态进行研究。本文以阿尔塔什水库为对象，针对不同水库运行工况，研究了排沙洞的拉沙效果，研究了冲刷漏斗形态和冲沙历时等。 首先，建立了阿尔塔什水库坝前试验模型，满足几何相似、水流运动相似和泥沙冲刷变形相似的原则，模型比尺1:150，正态模型。第二，在汛期，水库保持排沙水位1770m运行，研究发电排沙分流比分别为1:0.73、1:1.13、1:1.56、1:3.13、0:695.8时的冲刷漏斗形态，并提出排沙水位下保持发电洞“门前清”的泄流流量与冲沙历时，研究表明，关闭发电洞、开启1#深孔排沙洞最大流量695.8m3/s，冲沙历时16h，形成的冲沙漏斗能够满足发电洞“门前清”的要求。第三，在非汛期，水库保持正常蓄水位1820m运行，研究发电排沙分流比分别为1:0.70、1:1.39、1:2.09时的冲刷漏斗形态，并提出正常蓄水位下保持发电洞“门前清”的泄流流量与冲沙历时，研究表明，开启两个发电洞，每个发电洞流量为222.4m3/s，开启1#深孔排沙洞最大流量928.6m3/s，冲沙历时14h，形成的冲沙漏斗能够满足发电洞“门前清”的要求。第四，研究成果与类似工程试验结果进行了对比分析，，表明本文试验结果是合理的。
[Abstract]:In order to keep the "clear in front of the gate" of the power station, reduce the coarse sand passing through the machine and prevent the blockage of the gate in front of the dam, it is necessary to study the shape of the scour funnel in front of the inlet of the power station. Taking the Altash reservoir as the object, the sand pulling effect of the sand drainage tunnel, the shape of the scour funnel and the scouring duration are studied according to the different operation conditions of the reservoir. Firstly, the experimental model of Altash reservoir dam is established, which satisfies the principle of geometric similarity, similarity of flow movement and similarity of sediment scour deformation. The model is 1: 150, normal model. Secondly, during the flood season, the reservoir maintains the discharge water level at 1770 m, studies the scour funnel shape of the distribution ratio of power generation and sediment discharge is 1: 0.73: 11.13: 1: 1.5 6: 1: 3.131,0: 695.8, and puts forward that the discharge rate and sediment flushing duration of the power generation tunnel should be kept "clear in front of the gate" under the sand discharge water level. By closing the power generation tunnel and opening the maximum discharge of 695.8 m3 / s of the sand discharge tunnel in the deep hole of 1#, the sand washing lasted 16 hours, and the sand funnel formed could meet the requirement of "clear in front of the gate" of the power generation tunnel. Third, during the non-flood season, the reservoir maintains a normal water level of 1820m, studies the scour funnel pattern when the distribution ratio of power generation and sediment discharge is 1: 0.70 / 1: 1.39 / 1: 2.09, and puts forward the discharge flow and the duration of sand flushing at the gate of the power generation tunnel under the normal water level. The results show that the flow rate of each generation tunnel is 222.4 m3 / s, and the maximum discharge of 928.6 m3 / s is opened in the deep hole of 1#, and the scouring time is 14 h. The sand funnel formed can meet the requirement of "clear in front of the gate" of power generation tunnel. Fourthly, the research results are compared with the similar engineering test results, which show that the experimental results in this paper are reasonable.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV145;TV149.2
本文编号：2188448
[Abstract]:In order to keep the "clear in front of the gate" of the power station, reduce the coarse sand passing through the machine and prevent the blockage of the gate in front of the dam, it is necessary to study the shape of the scour funnel in front of the inlet of the power station. Taking the Altash reservoir as the object, the sand pulling effect of the sand drainage tunnel, the shape of the scour funnel and the scouring duration are studied according to the different operation conditions of the reservoir. Firstly, the experimental model of Altash reservoir dam is established, which satisfies the principle of geometric similarity, similarity of flow movement and similarity of sediment scour deformation. The model is 1: 150, normal model. Secondly, during the flood season, the reservoir maintains the discharge water level at 1770 m, studies the scour funnel shape of the distribution ratio of power generation and sediment discharge is 1: 0.73: 11.13: 1: 1.5 6: 1: 3.131,0: 695.8, and puts forward that the discharge rate and sediment flushing duration of the power generation tunnel should be kept "clear in front of the gate" under the sand discharge water level. By closing the power generation tunnel and opening the maximum discharge of 695.8 m3 / s of the sand discharge tunnel in the deep hole of 1#, the sand washing lasted 16 hours, and the sand funnel formed could meet the requirement of "clear in front of the gate" of the power generation tunnel. Third, during the non-flood season, the reservoir maintains a normal water level of 1820m, studies the scour funnel pattern when the distribution ratio of power generation and sediment discharge is 1: 0.70 / 1: 1.39 / 1: 2.09, and puts forward the discharge flow and the duration of sand flushing at the gate of the power generation tunnel under the normal water level. The results show that the flow rate of each generation tunnel is 222.4 m3 / s, and the maximum discharge of 928.6 m3 / s is opened in the deep hole of 1#, and the scouring time is 14 h. The sand funnel formed can meet the requirement of "clear in front of the gate" of power generation tunnel. Fourthly, the research results are compared with the similar engineering test results, which show that the experimental results in this paper are reasonable.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV145;TV149.2
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