首页|Design and Optimization of Diffuser and Deswirler for a 4 Stages Radial Blower with 1D and 3D CFD Methods
Design and Optimization of Diffuser and Deswirler for a 4 Stages Radial Blower with 1D and 3D CFD Methods
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SoftInWay Inc.performed the aerodynamic design of a 4 stages high pressure radial blower with vaneless diffusers and deswirlers for DMW Corporation in 2021.The nominal pressure ratio of the machine is near 2.Such a pressure ratio often characterizes what would typically be called a compressor,especially if the compression work is performed in one stage.For the subject machine of the present study,the compression work is split into 4 stages.This paper describes the design procedure for this blower,initially focusing in depth on the tradeoffs between work split,rotor diameter,and rotor vane back-sweep angle.The paper then presents a further design and optimization work of different variants of diffuser and deswirler based on aerodynamic performance for this 4 stages radial blower.The number of deswirler blades in the return channel was reduced from 19 to 10 in consideration of manufacturing requirements.To minimize losses in performance due to reduced blade number,several candidates of varied geometry shape deswirler blades were obtained from an automatic design and optimization workflow combining with 3D CFD calculation.All candidates of deswirler were implemented to the entire 4 stages radial blower to analyze machine per-formance by 3D CFD calculation and the best 10-blade deswirler geometry was determined.3D CFD analysis shows that 10 blades of deswirler is unable to provide the same pressure rise and efficiency as the original design with 19 blades when all other parts of the design,such as rotor and diffuser are maintained the same.To further improve the blower performance,the similar automatic workflow was applied to study vaned diffuser influence to the blower performance based on the new blower configuration.The number and geometry of best diffuser blades was obtained from the automatic workflow and entire blower performance with vaned diffuser was analyzed and validated by 3D CFD calculation.After finalizing the aerodynamic flow path geometries and configuration of new blower design,performance for new blower and old one are predicted by lD method with loss model correction and 3D CFD calculation.1D and 3D CFD calculation results are compared and good agreement is achieved.Though,small discrepancy between them is noticed and reasons are analyzed.Furthermore,3D CFD calculations with stall de-termination method based on several stall-indication metrics were performed to determine surge points of the 2 new blower configurations with vaned and vaneless diffuser.A future publication is intended to show the validation of the design with tested performance data.
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