基于Bezier曲线的离心压缩机叶片设计

Design of Centrifugal Compressor Blade Based on Bezier Curve

利用Bezier曲线将子午面型线参数化,设计出满足需要的叶轮子午面型线。在已知叶片进出口安装角和包角的情况下,给出一种基于子午面型线长度的叶片角设计方案。采用CFD方法对所设计的三种离心叶轮进行性能计算,并对比三种叶轮的优劣。通过对比可知,当轮毂叶片角分布采用前部加载式、轮缘叶片角分布采用中间加载式时,叶轮有较好的性能和较均匀的叶片载荷分布。

Based on the Bezier curve, the streamline of the meridional plane is parameterized and the designed streamline of the meridional plane of the blade meets the requirements. A designing scheme of the blade angle on account of the length of the streamline of the meridional plane is provided while the setting angle of blade and the wrap angle are known. The performance computation is carried out through CFD method on the three different blades and their strengths and weaknesses are compared. The results show that the blade has better performance and more uniform loading distribution when the blade angle of the wheel hub adopts the front loading type and the blade angle of the rim adopts the middle loading type.