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以某电站两级动叶可调式轴流风机为研究对象,基于节流阀UDF函数和SST k-w湍流模型,对轴流风机第一级动叶轮中单个叶片异常偏转角度分别为+6°和-6°时的旋转失速现象进行数值模拟.计算结果表明:当轴流风机第一级动叶轮中存在叶片安装角异常时,会引起风机提前进入失速,动叶异常偏转角度为+6°和-6°时,轴流风机失速裕度分别为21.06％和20.93％,较叶片正常偏转时分别降低了6.73％和6.86％;第一级单个动叶安装角异常对两级轴流风机失速诱发起始位置及失速类型几乎没有影响,与动叶正常偏转时相同;第一级动叶轮内单个叶片安装角异常对两级动叶轮内由失速先兆演化为失速团的三维非定常演化过程具有重要影响.研究结果进一步丰富了对多级轴流叶轮机械旋转失速复杂流动现象的认识.“,”Taking a two-stage axial fan with adjustable vanes as the research object,the 3D unsteady numerical simulation was conducted on the axial fan with abnormal installation angle of the first rotor based on the throttle valve function and SST k-w turbulence model.The abnormal installation angles of the single blade in the first rotor were +6° and-6° respectively.The numerical results show that the blade with abnormal angle will make the fan falling into unstable condition earlier.The stall margin is 21.06％ and 20.93％ separately when the abnormal installation angle is +6° and-6°.Meanwhile,compared to the axial fan with normal installation angle,the stall margins decrease 6.73％ and 6.86％ separately.The existence of abnormal angle blade does not cause the change of the induced position and type of stall inception,which are the same with the axial fan with normal blade angel.However,the single blade with abnormal installation angle in the first rotor has great influence on the 3D unsteady evolution process from stall inception to stall cell in the two rotors.The results have great significance for understanding the complex phenomenon of rotating stall in multi-stage axial turbo machine.