【作者】 张健；

【导师】 常近时；

【作者基本信息】 中国农业大学 ， 机械设计与理论， 2001， 硕士

【摘要】 本文针对水轮机组防飞逸保护及退出飞逸过渡过程，深入分析其工作机理和特点，给出并比较了多种防飞逸措施的优缺点，讨论了利用飞逸工况进行泄水的可行性。以内特性解析理论为基础，分别针对转桨式水轮机靠转动轮叶退出飞逸以及利用尾水闸门使水轮机组退出飞逸两种飞逸保护方式，给出了其退出飞逸过渡过程中各动态参数的计算方法及计算程序，并以白垢机组为例，分别对上述两种退出飞逸方法进行了过渡过程计算，并比较了各自的优缺点。 此外，本文还对退出飞逸过渡过程计算中的奇点工况进行了研究，讨论了水力机械过渡过程中的莫克里希损失，并在两台混流式水轮机上作了空载（飞逸）时导叶自动关闭的过渡过程现场试验，利用推出的相似换算公式，对试验测得的机组以某一转速空载运行导叶自动关闭到零流量时的转速值，进行相似换算，得出机组以其它转速空载运行导叶自动关闭到零流量时的转速值，并将计算值与现场试验实测值进行比较，验证了该相似换算公式的正确性。更多还原

【Abstract】 The thesis thoroughly analyzed the mechanism and the character of runaway protection and quitting runaway transient process for hydraulic turbines, gave and compared the merits and defects of some runaway protection measure, and also discussed the feasibility of drainage under runaway operating condition. Based on the theory of Internal Character Analysis, the calculating method and program on hydraulic turbine with movable blade quitting runaway by moving blade and hydraulic turbine quitting runaway by closing draft tube gate fleetly are given respectively. The quitting runaway process of Baigou Unit is calculated as an example, and the merits and defects of both methods are compared. In addition, the singular point operating condition of quitting runaway transient process is studied, and Mockridge Loss during the transient process of hydraulic turbine is discussed. The field test of transient process on auto-close of guide vane under no load (runaway) operating condition is done on two Francis turbines, and the speed of the turbine at zero flow rate when guide vane is auto-closed at a fixed speed under no load operating condition is gotten by similarity conversion formula with the speed of the turbine at zero flow rate when guide vane is auto-closed at a another fixed speed under no load operating condition. The calculating result is compared with test result, and the correction of the similarity conversion formula which is derived by deduction in the thesis is proved.更多还原