Abstract：In order to improve the heating efficiency of integrated ceiling heaters used in bathrooms, a multi blade centrifugal impeller blade structure and its design method were studied using a certain brand of bathroom electric heating equipment as an example under the blowing condition. Using CFX commercial fluid simulation software, and based on the results of CFD simulation, the shortcomings and defects of the original impeller in aerodynamic design are analyzed. Based on the design method of the original impeller blade profile formed by fiting logarithmic spiral lines and small arcs was proposed and designed. and the acceleration of the complex line of wind channel impeller, After comparing and analyzing the aerodynamic performance of the composite profile impeller with the original impeller through 3D printing, it was concluded that the air flow rate at the blower outlet was 216.2 m3/h, which increased by 13.9%, and the airflow speed at the outlet was more uniform and stable. In addition, the noise of the fan has decreased by 2.3 dB, which significantly improving the aerodynamic performance and heating efficiency of the heater. The numerical simulation and experimental study in this paper has theoretical significance and important engineering application value for the performance optimization and noise reduction design of multi-wing centrifugal heaters.
