带阻尼井的变顶高尾水系统水力过渡过程数值预测及其特性研究
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摘要
机组及输水系统在暂态过程中性能参数的控制对电站的安全稳定运行具有重要影响。基于瞬变流数学模型和Priessmann假设,对三峡地下电站采用的带阻尼井的变顶高尾水隧洞进行了过渡过程数值预测,并将计算结果与电站现场试验值进行了对比验证,总结了带阻尼井的明满交替流等复杂水力过程的数值预测模型。基于计算结果分析了在大小波动等暂态过程中变顶高尾水系统明满交替流及阻尼井的水力特性,并从水力学和系统稳定性的角度解释了三峡地下电站采用变顶高尾水洞并设置阻尼井能够代替调压室的原因。
Based on transient flow mathematic model and Priessmann hypothesis, the transient processes under seven operation conditions are predicted for the inclined-roof tailrace tunnel with damping tank in Three Gorges underground power station. The calculation results are compared with field test data. The mathematic model for studying the complicated hydraulic process with alternating non-pressure flow and pressure flow is concluded. The hydraulic rules of unsteady flow in inclined-roof tailrace tunnel and damping tank during the transient processes of large and small fluctuations are analyzed based on calculation results, and the reason of applying inclined-roof tailrace tunnel with damping tank to replace surge tank in Three Gorges underground power station is explained from the view of hydraulic rule and system operation stability.
Based on transient flow mathematic model and Priessmann hypothesis, the transient processes under seven operation conditions are predicted for the inclined-roof tailrace tunnel with damping tank in Three Gorges underground power station. The calculation results are compared with field test data. The mathematic model for studying the complicated hydraulic process with alternating non-pressure flow and pressure flow is concluded. The hydraulic rules of unsteady flow in inclined-roof tailrace tunnel and damping tank during the transient processes of large and small fluctuations are analyzed based on calculation results, and the reason of applying inclined-roof tailrace tunnel with damping tank to replace surge tank in Three Gorges underground power station is explained from the view of hydraulic rule and system operation stability.
引文
[1]辜晓原,李佛炎,禹芝温.向家坝水电站地下厂房变顶高尾水系统研究[J].水力发电,2004,30(6):23-27.
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[5]长江勘测规划设计研究有限责任公司.三峡右岸地下电站水力过渡过程计算专题报告[R].武汉:长江勘测规划设计研究有限责任公司,2004.
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[2]CHAUDHRY M H.实用水力过渡过程[M].陈家远,孙诗杰,张海滨,译.四川省水力发电工程学会,1985.
[3]Priessmann A,Cunge J A.Calcul des intumeseences sur machines electroniques[R].International Assoc.For Hydraulic Research,Dubrovnik,1961.
[4]王建华,李修树,江会福.三峡右岸地下电站变顶高尾水系统分析研究[J].人民长江,2002,33(7):1-3.
[5]长江勘测规划设计研究有限责任公司.三峡右岸地下电站水力过渡过程计算专题报告[R].武汉:长江勘测规划设计研究有限责任公司,2004.
[6]陈太平.水电站过渡过程中小波动稳定性分析研究[J].Dongfang Electric Review,2007,21(2):22-26.