简要论述局部扇风机（轴流式通风机）产生不稳定工况的原因和变化规律，提出以分流器消除风机特性曲线驼峰区段、使其工作运行稳定的技术措施。
The technical measures are given out by which the hump zone of characteristic curve of the local fan can be eliminated using a current divider and the operaiting stability of the fan can be improved.
混流式水轮机偏离最优工况运行有可能诱发机组的不稳定运行。
Francis turbine's operation out of the optimal mode may induce unstable operation of the generating unit.
前言：高炉轴流风机处于不稳定工况区运行或出现“抢风”都会造成事故。
Unstable operation or tacking for the axial fan of the blast furnace can cause accidents, which can be avoided by adjusting the Angle of the leading blade.
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