轴流风扇叶片截面翼型的多点优化设计

Multi-point Optimization Design on Blade Section Airfoil of the Axial Fan

风扇和压气机的叶型优化设计是高性能风扇设计过程中至关重要的环节。在影响其性能的各项因素中,叶片的几何形状及其相应的气动性能起着关键作用。某轴流风扇叶型在设计工况下,气动性能良好,但它的许可工作范围较小,在非设计工况下性能明显下降。文章将贝塞尔曲线的参数化方法、叶型气动性能薄剪切层流动预测法与梯度优化算法相结合,建立了多攻角和多马赫数工况下的叶型气动性能优化方法。结果表明,叶型在非设计工况点具有优化的空间,与原始叶型相比,优化后的叶型气动性能有所提高。

The optimization design on blade of the fan and compressor is the most important part of the high performance fan design process. Among the various factors affecting its performance, the geometry of the blade and its corresponding aerodynamic performance play a key role. An axial fan blade has good aerodynamic performance under the designed conditions, however, its allowable working range is rather small and the performance under non-design conditions changes significantly worse. The aerodynamic performance optimization method under both multi- attack- angle and multi-mach number condition is established by means of the parameterization method of Bezier curve combined with the thin shear layer flow prediction method of blade aerodynamic performance and gradient optimization algorithm. The results show that there is room for optimization of the blade profile at the non-design condition point while compared with the original blade profile, the optimized aerodynamic performance of the blade profile is improved.