本文采用NURBS曲线参数化表达和控制几何型线,结合CFD数值实验,对膨胀比为8的有机工质向心透平进行气动优化研究。跨声速喷嘴叶型型线经气动优化后,喷嘴内处于顺压梯度的加速流动状态,喉部跨声速膨胀流动得到改善,流场最大Ma降低,全工况下的叶栅总压损失系数显著减小,跨声速工况下的级组效率明显提高。叶轮子午流道型线经优化后,流道宽度变化更均匀平滑,原动叶轮吸力面分离被消除,透平级组效率也有提高。 In this paper, the NURBS curve is used to parameterize the expression and control geometry lines. Combined with the CFD numerical experiment, the aerodynamic optimization of the centripetal turbine with the expansion ratio of 8 is studied. After the aerodynamic optimization of the transonic nozzle airfoil, the nozzle is in an accelerating flow with a progressive pressure gradient, the transonic flow of the throat is improved, the maximum Ma of the flow field is reduced, and the total pressure loss coefficient of the cascade under all conditions is significant Reduced, transonic speed conditions significantly improve the efficiency of the level group. After optimization, the width of the runner is more uniform and smooth, the separation of the suction surface of the impeller is eliminated, and the efficiency of the turbine stage is also improved.