Multi-Objective Design Optimization of a Dump Diffuser with Wide Speed Range

The significance of the diffuser in ensuring stable performance of compressors at elevated discharge velocities has grown with the increasing demands of modern engines. This work presents an optimization of a dump diffuser under wide-speed flow conditions. A multi-objective optimization approach is applied, including a single design point and an extensive speed range, resulting in the acquisition of the Pareto front. By conducting a single- factor analysis, the changing rules of the parameters is determined, and the optimized outcomes are thoroughly examined. Following the optimization process, notable improvements of 14.1% and 43.0% are observed in the total pressure loss coefficient and static pressure recovery coefficient of the diffuser, respectively, thereby significantly enhancing its overall performance.