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将三维Navier-Stokes方程流场计算、网格自动生成、叶轮几何参数化与数值最优化方法相结合,构成了离心压气机工作轮自动优化设计软件。在几何参数化过程中,将叶片型面和子午面流道均作为设计参数,实现了组合优化。设定目标函数时兼顾非设计点性能,实现了在设计转速下整个流量范围内的气动性能优化。采用所研制软件,对带一排分流叶片的离心压气机工作轮进行了优化设计,结果表明优化后的工作轮在压比变化很小的前提下效率有明显提高。
The three-dimensional Navier-Stokes equation flow field calculation, automatic mesh generation, the geometric parameters of the impeller and numerical optimization method combined to form a centrifugal compressor working wheel automatic optimization design software. In the process of geometric parameterization, both the blade profile and the meridional flow channel are taken as design parameters to achieve the combination optimization. Setting the objective function balances non-design point performance and optimizes the aerodynamic performance over the entire flow range at design speed. The optimized design of the working wheel of a centrifugal compressor with a row of splitter blades was carried out by using the developed software. The results show that the efficiency of the optimized working wheel is obviously improved under the premise of small change of pressure ratio.