Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

New Insights into Flow for a Low-Bypass-Ratio Transonic Fan with Optimized Rotor

Version 1 : Received: 4 October 2023 / Approved: 4 October 2023 / Online: 5 October 2023 (02:12:19 CEST)

A peer-reviewed article of this Preprint also exists.

Liu, M.; Zhang, Z.; Liang, Z.; Xiao, H.; Chen, H.; Yang, X.; Shao, C. New Insights into Flow for a Low-Bypass-Ratio Transonic Fan with Optimized Rotor. Energies 2023, 16, 7230. Liu, M.; Zhang, Z.; Liang, Z.; Xiao, H.; Chen, H.; Yang, X.; Shao, C. New Insights into Flow for a Low-Bypass-Ratio Transonic Fan with Optimized Rotor. Energies 2023, 16, 7230.

Abstract

In order to balance the conflicts among mass flow rate, total pressure ratio, adiabatic efficiency and stall margin in a low-bypass transonic fan, the optimization of the rotor blade is implemented in this study. An advanced 3D optimization design system is adopted, and flow diagnostic methods based on vorticity dynamics are employed to discuss the flow field. Results indicate that by controlling the blade camber line curvature, significant improvements in the aerodynamic performance for the fan stage are achieved, the total pressure ratio is increased by 1.90%, while the adiabatic efficiency and mass flow rate are increased by 4.45% and 5.82%, respectively. Vorticity diagnosis suggest that there exists a close link between performance parameters and vorticity parameters in the axial fan/compressor, both azimuthal vorticity and boundary vortex flux have significant influences on the stage performance. Moreover, the boundary layer separation is accompanied by the spike of entropy and static pressure, while the derivation/gradient of these flow parameters would also suffer drastic changes under the effect of shock wave. The vorticity parameters could provide detailed flow information about the on-wall flow with high accuracy, which provides the researchers with a novel method for the turbomachinery aerodynamic design and analysis.

Keywords

low-bypass-ratio transonic fan; aerodynamic optimization; vortex dynamics; secondary flow; shock wave

Subject

Engineering, Aerospace Engineering

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