Design and Optimization of a Vaned Diffuser for a Transonic Centrifugal Compressor Based on 3D Inverse Design Approach

Abstract The design of vaned diffusers in centrifugal compressors plays a critical role in determining overall aerodynamic performance and operating range. In this paper, we present a comprehensive approach using the 3D inverse design method to optimise diffuser blades for enhanced performance at multiple operating points on the compressor map. The inverse design method allows the generation of blade shapes by prescribing the desired aerodynamic loading distribution, providing greater control and flexibility in tailoring the diffuser’s aerodynamic characteristics. To achieve a robust and adaptable design, the diffuser blades are parameterised based on blade loading profiles, which are then systematically optimised to improve efficiency and stability across a wide range of operating conditions. This optimisation process ensures a balance between aerodynamic efficiency, pressure recovery, and flow uniformity, while minimising losses across the entire map. A key advantage of this design and optimisation method is its computational efficiency, allowing the entire process to be completed on a 32-core machine in approximately one week. This makes the method both fast and cost-effective compared to traditional approaches, without compromising accuracy. The speed of the process enables rapid iterations and refinements to the diffuser configuration, ensuring the final design meets stringent performance targets across multiple operating points. The proposed method offers a promising pathway for achieving high-performance centrifugal compressors with improved map width, while providing a practical and affordable solution suitable for industrial applications.