李家河水库重力流输水工程中调节池消能的模拟研究
发布时间：2019-02-13 07:25
【摘要】：随着缺水地区供需矛盾的增长，大规模、长距离、跨流域调水工程的兴建越来越多，而由于输水管线长而且起伏变化复杂，在管道内很容易发生复杂的水力瞬变现象（水锤）。水力过渡过程现象持续的时间虽然短暂，但它往往会造成严重的工程事故，严重影响取水输水工程的正常运行和人民生命财产的安全。 西安市辋川河引水李家河水库工程由水库枢纽工程和输水工程两大部分组成，为减小末端管道压力并有效进行水锤防护，计划在李家河北干线桩号为27+602.6及桩号29+366.8处各设一处1000m3的调节池进行分段降压。根据实际运行工况，针对2号调节池提出三种优化消能方案（大闸阀矩形调节池、小闸阀矩形调节池、小闸阀圆形调节池）。 研究结果表明，在矩形调节池内无水垫情况下，射流会冲击调节池首部底板，对底板安全造成威胁。因此大闸阀方案在首次运行时，应首先采用Q1.0m3/s的管道流量对调节池进行充水，当充水深度大于2.2m时再逐渐增大至设计流量；小闸阀方案首次运行采用Q0.5m3/s的管道流量对调节池进行充水，当充水深度大于2.0m时再逐渐增大至设计流量。当池内水位较低时，采用圆形调节池射流会冲击到闸房进口处的池壁，因此圆池方案初次运行时，应采用Q0.5m3/s的管道流量对调节池进行充水，冲水深度宜大于2.0m。 在设计流量时，闸阀开度较小，三种设计方案的闸阀与调节池之间输水管道局部均存在负压，但其负压值较小，管道内平均流速小于30m/s，，根据规范要求可不做掺气处理。圆形调节池和矩形调节池从水力学角度均能满足设计要求，建议设计根据现场实际条件并结合试验结果选定最终方案。
[Abstract]:With the increase of the contradiction between supply and demand in water shortage areas, more and more large-scale, long-distance and cross-basin water transfer projects have been built. However, due to the long and complicated fluctuation and variation of water pipelines, complex hydraulic transient phenomena (water hammer) are easy to occur in the pipelines. Although the phenomenon of hydraulic transition lasts for a short time, it often results in serious engineering accidents, which seriously affects the normal operation of water intake and transportation projects and the safety of people's lives and property. The Wangchuan River diversion Lijiahe Reservoir Project in Xi'an City consists of two major parts: the reservoir hub project and the water conveyance project. In order to reduce the pressure of the end pipeline and effectively protect the water hammer, It is planned to set up a 1000m3 regulating pool at Lijia Hebei trunk pile number 27 602.6 and pile number 29 366.8 to reduce blood pressure by stages. According to the actual operating conditions, three optimal energy dissipation schemes (large gate valve rectangular regulating pool and small gate valve circular regulating pool) are proposed for the No. 2 regulating pool. The results show that when there is no water cushion in the rectangular adjusting pool, the jet will impinge on the bottom plate of the adjusting pool, which is a threat to the safety of the bottom plate. Therefore, when the large gate valve scheme is in operation for the first time, the pipe flow rate of Q1.0m3/s should be used to fill the regulating tank first, and then increase to the design flow rate when the water filling depth is more than 2.2 m. For the first time, the small gate valve scheme uses the pipeline flow of Q0.5m3/s to fill the regulating tank, and then increases gradually to the design flow when the water filling depth is more than 2.0 m. When the water level in the tank is low, the water jet of the circular regulating pool will impact the wall of the gate inlet, so the Q0.5m3/s pipeline flow should be used to fill the regulating tank at the initial operation, and the depth of the water should be more than 2.0 m. When the flow rate is designed, the opening degree of gate valve is smaller, and the negative pressure exists in the local area between the gate valve and the regulating pool of three design schemes, but the negative pressure value is smaller, the average velocity in the pipeline is less than 30 m / s, and the aeration treatment can not be done according to the requirements of the specification. The circular and rectangular regulating pools can meet the design requirements from the point of view of hydraulics. It is suggested that the final scheme should be selected according to the actual conditions in the field and combined with the test results.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV672;TV653
本文编号：2421314
[Abstract]:With the increase of the contradiction between supply and demand in water shortage areas, more and more large-scale, long-distance and cross-basin water transfer projects have been built. However, due to the long and complicated fluctuation and variation of water pipelines, complex hydraulic transient phenomena (water hammer) are easy to occur in the pipelines. Although the phenomenon of hydraulic transition lasts for a short time, it often results in serious engineering accidents, which seriously affects the normal operation of water intake and transportation projects and the safety of people's lives and property. The Wangchuan River diversion Lijiahe Reservoir Project in Xi'an City consists of two major parts: the reservoir hub project and the water conveyance project. In order to reduce the pressure of the end pipeline and effectively protect the water hammer, It is planned to set up a 1000m3 regulating pool at Lijia Hebei trunk pile number 27 602.6 and pile number 29 366.8 to reduce blood pressure by stages. According to the actual operating conditions, three optimal energy dissipation schemes (large gate valve rectangular regulating pool and small gate valve circular regulating pool) are proposed for the No. 2 regulating pool. The results show that when there is no water cushion in the rectangular adjusting pool, the jet will impinge on the bottom plate of the adjusting pool, which is a threat to the safety of the bottom plate. Therefore, when the large gate valve scheme is in operation for the first time, the pipe flow rate of Q1.0m3/s should be used to fill the regulating tank first, and then increase to the design flow rate when the water filling depth is more than 2.2 m. For the first time, the small gate valve scheme uses the pipeline flow of Q0.5m3/s to fill the regulating tank, and then increases gradually to the design flow when the water filling depth is more than 2.0 m. When the water level in the tank is low, the water jet of the circular regulating pool will impact the wall of the gate inlet, so the Q0.5m3/s pipeline flow should be used to fill the regulating tank at the initial operation, and the depth of the water should be more than 2.0 m. When the flow rate is designed, the opening degree of gate valve is smaller, and the negative pressure exists in the local area between the gate valve and the regulating pool of three design schemes, but the negative pressure value is smaller, the average velocity in the pipeline is less than 30 m / s, and the aeration treatment can not be done according to the requirements of the specification. The circular and rectangular regulating pools can meet the design requirements from the point of view of hydraulics. It is suggested that the final scheme should be selected according to the actual conditions in the field and combined with the test results.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV672;TV653
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