Study On Effect Of Impeller Design On Air Volume And Noise Of Fan System In Range Hood

The huge business opportunities and intense competitions coexist in the current domestic market. To gain the initiative in the current range hood market, the air volume and noise, two most important considerations for purchasing, are to meet higher requirements as range hood continues to develop. This paper comes from a school-enterprise cooperation project, whose goal is to enhance air volume and significantly reduce noise along. Normally, air volume and efficiency are chosen as dual-objective in optimization, instead of the combination of noise and air volume. And most optimization study is based on existing product, improving air volume and noise reduction to a limited extent.In order to improve the real value of range hood, this paper newly design the original model of centrifugal fan system, set simulation experiments based on computational fluid dynamics (CFD), optimize dual-objective in the fan system through orthogonal experiment method, enhance the fan performance effectively, study the impact of structural parameters of impeller on air flow and noise, and propose the use of above theories to guide the design of centrifugal fan systems.First, take the use of empirical design method to complete the aerodynamic design of the initial model, volute, impeller and current collector included. Access to a wide range of parameters and complete the3D modeling in UG.Second, explore suitable numerical simulation for this specific flow field characteristic, realize meshing of flow channel in ICEM CFD, complete simulation calculation of rotating system in CFX, and analyze the effectiveness and rightfulness of the simulation model.And then, arrange orthogonal experiment, conduct range analysis. Determine the structure parameter combination to the dual-optimal target using comprehensive balance method and comprehensive scoring method. Air volume and fan noise performance is effectively improved and design goal is achieved. Again, find out the relationships between air volume and each structural parameter with factor index analysis. Find the friction loss and the inner loop phenomenon which cause air volume decrease by comparing velocity contours, velocity vector, pressure contours, eddy current contours etc.Last, discuss the noise sources of range hood, and find out the relationships between aerodynamic noise and each structural parameter. Study vortex noise characteristics and rotation noise characteristics based on Proudman noise theory, including vortex noise caused by strong pre-curved blades, influence mechanism of structural parameters on rotation noise, and contrast of baseband noise and overall noise. Analyze the affecting factors of quadrupole-source noise.The range hood fan system model in the paper is optimized to meet the design goal. Through dual-objective optimization method, the current performance of products is effectively improved. The results obtained in research work can provide a theoretical basis for the engineering design of the range hood fan system, and for the reduction of the workload and blindness in centrifugal fan engineering.