可控曲率技术在某高负荷轴流风扇气动优化设计中的应用

Aerodynamic Design Optimization of a Highly Loaded Axial-flow Fan Based on Curvature Control Technique

针对高负荷跨音速风扇级内部强逆压力梯度、强黏性剪切与可压缩跨音速流动特征,基于通道几何曲率控制技术开展高负荷跨音速风扇级的气动优化设计。通过合理调整通道几何曲率分布规律,在设计条件下,获得了一个高负荷风扇级气动新结构。结果表明:优化后的高负荷风扇级总压比达到2.490,绝热效率大于87%,质量流量达到25.8 kg/s,具备了较宽的高效率工作范围;叶片通道几何曲率从动力学层面上对通道附面层乃至主流具有重要的导流以及整流效果。

Aiming at the features of high adverse pressure gradient,high viscous shear and compressible transonic flow in a highly loaded fan stage,an aerodynamic design optimization was conducted on the fan stage based on geometric curvature control technique.Through reasonablly adjusting the geometric curvature distribution,a new aerodynamic structure was obtained for the fan under design conditions.Results show that after optimization,the total pressure ratio of fan stage achieves 2.490,the adiabatic efficiency gets above 87%,and the mass flow rate reaches 25.8 kg/s,indicating a wider scope of operation with high efficiency.The geometric curvature of blade passage has important driving and adjusting effects on the mainstream and the flow in boundary layer in terms of dynamics.