Tandem configuration is an effective methodology to reduce flow separation on compressor blade suction surface and to improve blade loading. However, in modern highly loaded cases, corner separation remains as its single blade counterpart. In this study, non-axisymmetric endwall profiling (NAEP) was utilized in a highly loaded tandem cascade (diffusion factor D = 0.69), aiming at reducing its severe corner separation and revealing the unique flow mechanism while NAEP is utilized in tandem cascade. NAEP was designed in both forward (F) blade and rare (R) blade separately, and was investigated numerically in tandem environment. Results show that, NAEP in F blade passage can effectively eliminate the corner separation and reduce loss generation, whereas NAEP in R blade passage has no positive effect on corner separation and even promotes loss production. The optimal NAEP approximately removes the corner separation completely, with loss coefficient reducing by as much as 37.8%. The optimal NAEP for the tandem cascade features optimal axial location at the origin of corner separation. There is an optimal NAEP height (0.02 of blade height), under which NAEP can achieve pretty good control effect while the peak of NAEP varies in a large axial location range. In the tandem configuration, it is found that NAEP transfers blade loading from R blade to F blade; the static pressure increases significantly for the entire cascade, but the static pressure distribution of F blade does not exhibit as the design intent of NAEP. In addition, it is interesting to find that the flow turning near endwall reduces after endwall profiling, which is unique in tandem cascade and is contrast to the view on conventional configuration. On the contrary, NAEP in R blade has no influence on the corner separation of the tandem cascade; due to the decrement of cross-passage pressure gradient for R blade, the flow overturning near endwall reduces.

串联配置是一种有效的方法，可减少压缩机叶片吸入表面上的流动分离并提高叶片负载。但是，在现代的高负荷情况下，转角分离仍然是单个刀片的对应部分。在这项研究中，非轴对称端壁轮廓分析（NAEP）用于高负载串联叶栅中（扩散因子D = 0.69），旨在减少其严重的角分离并揭示了在串联叶栅中使用NAEP时独特的流动机理。NAEP是分别在前（F）刀片和稀有（R）刀片中设计的，并在串联环境中进行了数值研究。结果表明，F叶片通道中的NAEP可以有效消除转角分离并减少损失的产生，R叶片通道中的NAEP对转角分离没有积极影响，甚至会促进损失的产生。最佳的NAEP大约完全消除了角距，损耗系数降低了37.8％。串联叶栅的最佳NAEP在转角分离的起点具有最佳的轴向位置。有一个最佳的NAEP高度（叶片高度的0.02），在此范围内NAEP可以达到很好的控制效果，而NAEP的峰值在较大的轴向位置范围内变化。在串联配置中，发现NAEP将叶片载荷从R叶片转移到F叶片；整个叶栅的静压显着增加，但是F叶片的静压分布没有表现出NAEP的设计意图。此外，有趣的是，在端壁轮廓分析之后，靠近端壁的流量减小了，这在串联级联中是唯一的，并且与常规配置的观点相反。相反，R叶片中的NAEP对串联叶栅的角间距没有影响；由于R叶片的交叉通道压力梯度减小，端壁附近的倾覆流量减小。