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角区流动的现象普遍存在,其中角区流动分离是制约叶轮机性能提升的关键因素。针对抑制或消除角区分离情况,在简要回顾二面角原理的基础上,提出叶身/端壁融合技术(Blended Blade-EndWall,BBEW),指出了其所包含的二面角原理的3种应用方式,并以NASA 67号转子叶片为例,采用数值方法研究了应用第2种方式(即增大过渡曲面最小曲率半径方式)的改型效果。结果表明:采用二面角原理第2种应用方式的BBEW能够有效地减弱或消除高负荷叶片吸力面角区分离,进而明显改善了67号转子叶片性能,因此BBEW是抑制或消除角区分离的有效技术。
The phenomenon of flow in the corner area is ubiquitous, and the flow separation in the corner area is the key factor that restricts the performance improvement of the turbine. Based on a brief review of the principle of dihedral angle, a Blended Blade-End Wall (BBEW) technique is proposed to suppress or eliminate the separation of corner regions. Three types of dihedral angle principle And taking the rotor blade of NASA 67 as an example, the numerical method is used to study the effect of the second method (that is, to increase the minimum radius of curvature of the transition surface). The results show that the BBEW with the second application of the dihedral principle can effectively reduce or eliminate the angular separation of the suction surface of a high-load blade, thereby significantly improving the rotor blade performance of the No. 67 rotor. Therefore, the BBEW can restrain or eliminate the angular separation Effective technology.