Structure optimization of multi-wing centrifugal fan volutes for wind-warm bath heaters based on CFD

Taking the overall structure of a multi-wing centrifugal fan inside a certain model of wind-warm bath heater as the research object, the simulation analysis and structure optimization of the prototype fan are carried out by using Fluent, and the results show that the error between the simulation result and the measured result is within 5%, which verifies the reliability of CFD numerical simulation method to optimize the multi-wing centrifugal fan. On the basis of the above research, the simulation optimization and experimental test schemes with different volute widths and axial dimensions are designed. Based on the numerical simulation results, the internal flow and aerodynamic performance of each scheme is analysed. The optimal volute width is determined to be 84 mm, and the optimal size combination is a top clearance of 3 mm and a bottom clearance of 11 mm. The numerical simulation results show that the flow velocity of the internal flow field of the optimized fan is significantly increased. The test results show that the optimized fan has a 5.88% increase in outlet air volume and a 7.91% increase in total pressure efficiency under design conditions, and the comprehensive performance is improved, providing a clear method for structural optimization and performance evaluation of similar bath heaters.