基于寿命与可靠性的离心叶轮多学科设计优化

To optimize the centrifugal impeller with the characteristics of the multi-field coupling, in this work we developed a multidisciplinary reliability design-optimization method that considers the aerodynamics, heat transfer, strength, life, reliability, and effect of uncertainties. A parametric model was established for the centrifugal impeller on the basis of the non-uniform rational B-spline and feature modeling technology. Based on the transfer of the coupling information, we implemented a multidisciplinary analysis of the centrifugal impeller, including its aerodynamics, heat transfer, strength, and life to experimentally identify the main design parameters that influence the centrifugal impeller's aerodynamic performance and life. We selected seven parameters as design variables and, using a surrogate model, we optimized the performance of the centrifugal impeller using life reliability as a constraint and the isentropic efficiency and total pressure ratio as objectives. The results show that the entropy efficiency and total pressure ratio of the centrifugal impeller were increased by 3.4% and 6.2%, respectively, and the maximum Mises stress was reduced by 10.3%, while satisfying the life reliability constraint. The improvement in the performance of the centrifugal impeller proves the effectiveness of the developed method.