Study Of Aerofoil Optimization Of Axial Ventilator

Low efficiency of the ventilation machinery is the main reason which caused the high energy consumption of the building ventilation currently. Ventilation fan, which widely used, has is also the problem of low efficiency, and its operation noise has affected the living environment of people's. Because of the bad design, the ventilation fan has a common problem of low efficiency and high noise. In this paper, a particular fan model and its optimized models have been studied. The computational fluid dynamics software FLUENT was used to study the whole flow field distribution of the original and modified fan model, at the same time, the effect of the modify methods on pressure distribution, velocity distribution and the performance curve of the flow field are all taken in considerate.Pressure and velocity distribution of the flow field before and after modification of the ventilation fan were simulated using the numerical method in this paper. Proper simplification has been done to the whole model of the axial-flow fan during the simulation process, such as omitted the complicated internal hub structure and take no consideration about the round of actual model. The whole flow field of axial-flow fan was calculated base on the k ?εmodel. The conservation of energy equation was not used. Tetrahedral mesh was used in all models. The mesh of the blade which has large curvature is smaller as a result of larger variables of the velocity and pressure gradient.In this paper, a detailed analysis has been done to the numerical simulation results of the model adjustment in fan blades import or export installation angle, and adding front or back platform model. The results display the flow field distribution and performance curve before and after optimization of the ventilation fan. It is summarized that adding front and back platform would minish the velocity and pressure gradient and streamline separation, and enhance the stiffness of the blades so that leaves a smaller tremor, but the ventilation declined. The installation angle adjustment has an impact on the flow field distribution and performance curve, and there is an optimal angle making the fan performance best. Adding a small manufacturing error will affect the performance of products, so there is a need to ensure the accuracy of product during the manufacturing. Both the positive and negative impact of modification methods the on the flow field distribution has been discussed in this paper, which provided the theoretical foundation to the optimal design of the fan for the next step.