以某600 MW机组配套的两级轴流风机为研究对象，采用Fluent软件对其进行三维数值计算，研究了静叶倾斜对风机性能和噪声的影响。结果表明：当正倾斜角度15°时，在设计工况风机效率提高0.09%、全压降低036%；静叶正倾斜角度大于25°或反倾斜时，风机效率和全压均降低。静叶正倾斜使两级静叶区的总声压级均有所降低，正倾斜15°时在设计工况点第2级静叶区总声压级降低4.4 dB，且倾斜角度越大降噪效果越显著；静叶反倾斜后，第1级静叶噪声基本不变，第2级静叶区总声压级增大2.5 dB。综合分析静叶倾斜对风机性能和噪声的影响，静叶正倾斜15°为最优方案。

Taking a twostage variablepitch axial fan of a 600 MW power unit as an example, Fluent software was used to perform a threedimension numerical calculation of the fan and study the effect of leaned guide vanes on performance and aerodynamic noise of an axial flow fan. Results show that when the positive lean angle is 15°, the fan efficiency increases by 0.09% and the total pressure decreases by 0.36% at the design operating point; when the positive lean angle is greater than 25° or the guide vanes are negatively leaned, the fan efficiency and total pressure are both reduced. The positive lean of guide vanes reduces the total sound pressure level in the twostage guide vane region. For the positive lean angle of 15°, the total sound pressure level in the second stage guide vane region is reduced by 4.4 dB at the design operating point. And the greater the lean angle is, the more significantly the overall sound pressure level decreases. After the guide vanes are negatively leaned, the noise of the first stage guide vanes is roughly unchanged, and the overall sound pressure level of the second stage guide vane region increases by 2.5 dB. Considering the influence of leaned guide vanes on fan performance and aerodynamic noise, the positively leaned guide vane of 15° is the optimal scheme.

TH432