叶轮机械气动优化设计中的近似模型方法及其应用

Aerodynamic Optimization Design of Turbomachinery with Approximation Model Method

针对在工程中完全采用随机类优化方法寻优时计算量过大的问题,应用统计学的方法发展了计算量小、在一定程度上可以保证设计准确性的近似模型方法.在气动优化设计过程中,用该模型取代耗时的高精度的计算流体动力学分析,可以加速设计过程,降低设计成本.基于统计学理论提出的近似模型方法有效地平衡了基于计算流体动力学分析的叶轮机械气动优化设计中计算成本和计算精度这一对矛盾,在离心压气机叶片扩压器、叶轮和混流泵叶轮设计等问题中得到了成功应用,展示了广阔的工程应用前景.目前,已经建立了离心压气机部件及水泵叶轮的优化设计系统,并在工程设计中发挥了重要作用.

To reduce huge computation of the traditional stochastic optimization methods for engineering optimization, approximation model methods with acceptable accuracy for engineering design are developed based on the statistical theory. Especially, the approximation model methods can be applied to the aerodynamic optimization design instead of the time-consuming computational fluid dynamics （CFD） analysis to shorten the design process and reduce the computational cost. In the aerodynamic optimization design of turbomachine, the approximation model methods enable to balance the computational cost and accuracy, whose successful applications in centrifugal compressor impeller, diffuser, and mixed-flow pump impeller designs are introduced to show a wide engineering foreground. An optimization design system has been constructed and practically used for centrifugal compressor components and mixed-flow pump impeller.