| The centrifugal impeller is one of the major energy consuming equipment in industrial production. The centrifugal fan is the power consumption, power plant after pump therefore, research and improvement of fan to improve its performance, has the important meaning of energy efficiency of thermal power plant.This paper takes the G4-73 no 8D type centrifugal fan as the research object, in reference to the original fan, spiral case of optimization of fan and fan volute based geometric model width optimization, using Gambit will spiral case and the width of the optimization results coupling, establishes a coupling fan physical model, and the use of unstructured grid of grid division of. Using Spalart-Allmaras turbulence model, using the Fluent numerical simulation software, the numerical simulation of three-dimensional flow field inside the coupling of the wind turbine, and the simulation results are compared and analyzed the simulation results with the original numerical wind machine, spiral case of optimization of fan and fan volute width optimization.The calculated results show that: the spiral case of optimization, volute width optimization and coupling fan outlet velocity field distribution. In the small flow rate condition, working ability is stronger variable coupling fan; other cases, profile optimization for wind turbine variable condition capability; volute width optimization for wind turbine efficiency and the total pressure has been greatly improved, especially the small flow area. When the fan load is between 65%~110%, type line after optimization, the total pressure of the blower fan is increased by 3.64% compared with the original, the efficiency increased an average of 3.42%; coupling fan at 65% load condition, the total pressure and efficiency decline slightly in the 75%~110% load, coupling the total pressure of the blower fan improved compared with the original 2.07%, efficiency increased an average of1.88%. |
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