【作者】 张雷克； 吴嵌嵌； 马震岳； 王雪妮；

【Author】 ZHANG Leike;WU Qianqian;MA Zhenyue;WANG Xueni;College of Water Resources Science and Engineering, Taiyuan University of Technology;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology;Civil Engineering Institute, Sanjiang University;School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology;

【机构】 太原理工大学水利科学与工程学院； 大连理工大学海岸和近海工程国家重点实验室； 三江学院土木工程学院； 大连理工大学建设工程学部水利工程学院；

【摘要】 由尾水管偏心涡带诱发的水力激励是引起水电站机组及厂房结构在过渡工况下产生剧烈振动的核心水力振源之一。本文从理论分析的角度提出了一种在不同负荷工况下尾水管压力脉动水力激励数学表述,以水力发电系统水-机-电-结构耦联模型为研究对象,对其机组转子及转轮结构在突增负荷非稳态运行情况下的振动特性进行了分析。计算结果表明,同稳态工况相比,机组转子、转轮在瞬态工况下均存在运行稳定性降低、振幅明显增大等现象。本文研究成果可为水电站机组在该过渡工况下的动力响应分析提供合理可靠的模型与研究方法。更多还原

【Abstract】 The hydraulic excitation induced by eccentric vortex of draft tube is one of the core vibration sources, giving rise to serious oscillation problems for hydraulic generating set and plant structure, during transient process. In this paper, a mathematical expression of fluctuation pressure of draft tube under different load conditions is proposed from the perspective of theoretical analysis. Taking hydraulic-mechanical-electrical-structural model of hydroelectric generation system as research target, the corresponding instable operation property of rotor and runner parts when sudden load-up happens is conducted. It is shown from calculation results that, with comparison of stable working condition, the stability of rotor and runner is decreased and the matching vibration amplitude is notably increased when system is operated in transient process. The work of this paper can provide a reasonable and reliable model and research method, for the dynamic response analysis of hydraulic generating set under sudden load increasing transition condition更多还原