高负荷低压风扇三维气动设计与损失分析

Research on three-dimensional aerodynamic design of transonic fan and loss analysis

在给定的限制条件下,通过从S2反问题计算出发,依靠在粗、细网格上求解三维黏性Navier-Stokes(N-S)方程的设计方法完成了某高负荷、跨声速低压风扇的气动设计.该设计方法抛弃了准三元设计对损失模型的依赖,较快的实现了跨声速风扇的气动设计.在设计结果的基础上,对风扇流场结构的分析表明,动叶顶部激波,以及激波、泄漏流和附面层的相互作用是风扇损失的主要来源.全三维的弯扭叶片设计实现了静叶的高亚声大折转角扩压流动.

This paper presented the aerodynamic design process for a low pressure transonic fan stage. The solver based on three-dimensional （3-D） viscous Navier-Stokes equations has been adopted as a main design tool with coarse and thick mesh, although the initial blade was sourced from the solution of S2 inverse solver. This design method eliminated the reliance on loss models in quasi 3-D design for the designer. Based on the design result, the flow field structure in the fan stage was also studied in this paper. The main flow loss of the rotor was originated from the shock and the interaction among shock, leakage flow and boundary layer. The 3-D stator design has achieved successfully the high subsonic airflow with high turning angle.