In this paper, the effects of various parameters, especially three engineering parameters (twist, sweep, lean), on aerodynamic and structural performance of the fan blade were investigated. The change of blade geometry was realized by the free-form deformation (FFD) approach, which was more flexible than traditional parametric methods. A coupled iterative loop was used in a multi-objective optimization process considering two operating conditions. Not only the effect of a single parameter, but also the coupled effects of any two of them were studied. From the Design of Experiment (DoE) results, it was found that the twist and sweep have a relatively strong influence on aerodynamic performance compared with the lean. In addition, it's noteworthy that the effect of twist varied at different operating conditions. At a relatively low mass flow rate, an excessive twist caused a sudden drop in the total pressure ratio. Optimization results showed that the maximum blade stress was dominated by the twist, and a backward sweep at mid-span decreased the stress on the blade surface. The design of twist (DoT) and sweep (DoS) provided a significant improvement of total pressure ratio ranging from 5% to 15% approximately throughout the operating range. Although the peak efficiency was increased by about 1.3% for DoT, the strong tip leakage vortex caused a premature rotating instability compared with the baseline design.

本文研究了各种参数，尤其是三个工程参数（扭转，扫掠，倾斜）对风扇叶片的空气动力和结构性能的影响。叶片几何形状的变化是通过自由形式变形（FFD）方法实现的，该方法比传统的参数化方法更灵活。考虑两个操作条件，在多目标优化过程中使用了耦合的迭代循环。不仅研究了单个参数的影响，还研究了其中两个参数的耦合影响。从实验设计（DoE）的结果中发现，与倾斜相比，扭曲和后掠对空气动力性能的影响相对较大。此外，值得注意的是，扭曲的效果在不同的运行条件下会有所不同。在相对较低的质量流量下，过度扭曲会导致总压力比突然下降。优化结果表明，最大的叶片应力由扭曲决定，中间跨度的后掠减小了叶片表面的应力。扭曲（DoT）和掠过（DoS）的设计在整个工作范围内提供了大约5％至15％的总压力比的显着改善。尽管DoT的峰值效率提高了约1.3％，但与基线设计相比，强烈的尖端泄漏涡流导致过早的旋转不稳定性。扭曲（DoT）和掠过（DoS）的设计在整个工作范围内提供了大约5％至15％的总压力比的显着改善。尽管DoT的峰值效率提高了约1.3％，但与基线设计相比，强烈的尖端泄漏涡流导致过早的旋转不稳定性。扭曲（DoT）和掠过（DoS）的设计在整个工作范围内提供了大约5％至15％的总压力比的显着改善。尽管DoT的峰值效率提高了约1.3％，但与基线设计相比，强烈的尖端泄漏涡流导致过早的旋转不稳定性。