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洪振国, 李建伟, 苟勤章.水室与溢流相结合的新型调压井水力学计算研究水资源与水工程学报[J].,2019,30(3):165-169
水室与溢流相结合的新型调压井水力学计算研究
Hydraulics calculation of new surge tank combining water chamber with overflow
  
DOI:10.11705/j.issn.1672-643X.2019.03.25
中文关键词:  水电站  调压井  水力学计算  数学模型法
英文关键词:hydropower station  surge shaft  hydraulics calculation  mathematical model method
基金项目:
作者单位
洪振国, 李建伟, 苟勤章 (云南省水利水电勘测设计研究院 云南 昆明 650021) 
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中文摘要:
      目前对水室与溢流相结合的新型调压井研究较少,水室和溢流相结合的新型调压井通过溢流堰溢流和水室补水,能有效降低调压井高度,因此有必要对水室和溢流相结合的新型调压井进行研究。水室和溢流相结合的新型调压井结构复杂, 调压井水力学计算是该新型调压井研究的重要课题。以腊寨水电站水室与溢流相结合的新型调压井为例,通过水电站引水系统建立数学模型,完整地考虑了系统各环节非线性因素的影响以及上游水库、分叉管路、调压井、水轮机等边界条件,利用特征线方法进行管道水击计算,托马公式进行调压井稳定断面计算。结果表明:机组负荷突然发生变化时,机组转速随之变化,调压井水位上下波动不断衰减,最终水位稳定。机组转速、蜗壳和尾水管压力满足规范要求,达到了经济、安全、可靠的目的,机组的调节最大偏差小、时间短、振荡次数少,动态品质指标较好。调压井最低涌波水位高于调压井底板高程,最高涌波水位低于调压井顶高程,满足调压井不掺气和不漫顶的要求,因此调压井体型设计合理,水电站运行安全。
英文摘要:
      At present, few scholars have studied the new surge well that combining water chamber with overflow, which can effectively reduce the height of surge well by overflow weir and water chamber. Therefore, it is necessary to conduct more studies on this type of new surge well. Hydraulic calculation of the new surge wells is an important subject due to the complex calulations. Taking the new surge tank of Lazhai Hydropower Station as an example, this paper establishes a mathematical model through the diversion system of the hydropower station. The influence of non-linear factors in each link of the system is fully considered. The boundary conditions of upstream reservoirs, bifurcated pipelines, surge wells and hydraulic turbines are also taken into account. The pipeline water hammer calculation is carried out by the method of collecting lines. The Toma formula is used to calculate the stable section of surge shaft. The results showed that when the unit load suddenly changes, the unit speed changes accordingly, the fluctuation of surge well water level decreases continuously, and the final water level is stable. In addition, the speed, volute and draft tube pressure of the unit meet the requirements of specifications and reach the economic and safe and reliable range. The maximum adjustment deviation of the unit is small, the time is short, the number of oscillations is small, and the dynamic quality index is good. The lowest surge water level of surge wells is higher than the bottom elevation of surge wells, and the highest surge water level of surge wells is lower than the top elevation of surge wells, which meets the requirements of no aeration and overtopping of surge wells. Therefore, the shape design of the new surge wells is reasonable and the hydropower station operates safely.
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