Flow stability enhancement for axial flow compressors under radially distorted inlet conditions through rotor sweep design is an important issue for designers. To investigate the couped effect of rotor swept and radial inlet distortion on flow stability, steady numerical simulations, theoretical model predictions, and experimental validations were conducted for a low-speed, single-stage axial compressor (TA36) under various intensities of tip total pressure distorted inlet conditions with different swept rotor configurations. The steady pressure rise significantly decreases as the intensity of the distortion increases, whereas the rotor sweep has little effect on the pressure rise characteristic. The maximum error via model prediction is 1.25 %, while for steady numerical calculation, it is 3.89 %. Higher intensities of distortion lead to worse flow stability. Under radially distorted inlet conditions, forward sweep enhances flow stability whereas backward sweep further worsens it. What's more, quantitative analysis shows that the stability enhancement of forward sweep cannot fully counteract the adverse impact of radial distortion on flow stability. Elevated rotor tip loading was identified as the primary cause of instability under tip total pressure distorted inlet conditions. Forward sweep can slightly reduce this loading, whereas backward sweep has the opposite effect. Furthermore, the impact of rotor sweep on rotor tip loading intensifies with increasing distortion intensity. Unsteady flow field analysis was conducted. Which shows that radial distortion and blade sweep both affect flow stability by altering the intensity of tip leakage flow.

中文翻译：

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径向入口变形下带后掠转子叶片的低速压缩机的流动稳定性分析


通过转子扫描设计增强轴流式压缩机在径向变形入口条件下的流动稳定性是设计人员的一个重要问题。为研究转子扫掠和径向入口变形对流动稳定性的协同效应，以低速单级轴流式压缩机 （TA36） 为研究对象，在不同桨叶尖总压变形入口条件下，采用不同扫掠转子配置。随着变形强度的增加，稳定的压力上升显着降低，而转子扫描对压力上升特性的影响很小。通过模型预测的最大误差为 1.25 %，而对于稳态数值计算，则为 3.89 %。变形强度越高，流动稳定性越差。在径向扭曲的入口条件下，前向扫描增强了流动稳定性，而向后扫描则进一步恶化了流动稳定性。此外，定量分析表明，正向掠频的增稳并不能完全抵消径向畸变对流动稳定性的不利影响。在尖端总压力扭曲的入口条件下，升高的转子尖端负载被确定为不稳定的主要原因。前向扫描可以略微减少此负载，而向后扫描则具有相反的效果。此外，转子扫描对转子尖端负载的影响随着变形强度的增加而加剧。进行非定常流场分析。这表明径向变形和叶片扫描都通过改变尖端泄漏流的强度来影响流动稳定性。