不对称静子尾迹流场激振力分析及计算方法

为降低转子叶片在前排静子尾迹流场激振情况下的动应力,提高转子叶片疲劳寿命,对不对称静子叶片分布进行流场分析,研究在不对称静子分布非谐情况下,转子所受到的尾迹流场的激振力频谱及幅值.研究表明不对称静子分布非谐设计下,转子所受到的激振力由静子均布情况下的单频率高幅值激振转变为多频率成分低幅值激振力,通过对各个频率成分幅值的计算分析,得到了不对称静子分布非谐设计可有效降低转子叶片受到的尾流激振力,提高疲劳寿命的结论.同时,对不对称静子分布的三维流场计算,提出了简化计算方法,可大大降低计算时间和对计算机硬件要求. 

Investigation of force under asymmetry stator wake

To reduce the forcing response of rotor blades due to the wake of front stator vane,a study of front stator aerodynamic mistuned was proposed.The main aims of this article lie on following two aspects.First one explored how to simulate three-dimension rotor-stator unsteady flow field for asymmetry stator in a simplification algorithm so as to reduce calculating time and computer requirements.The other one is to analyze the force of rotor blade under the asymmetry stator wake using the simplified method.Study shows that asymmetry stator mistuned design changes the original force of rotor from single frequency and higher amplitude to more frequencies and lower amplitude,as a result,mistuned design reduces the wake force on rotor efficiently.