Aerodynamic Design And Performance Study Of Reversible Airfoil Profile

Airfoil profile is the basis of various rotating machinery. The selection and designing have a direct effect on the overall performance. For the rotating machinery which requires ventilation in two directions, the common airfoil cannot meet the requirements to achieve excellent effect. Therefore, the research of reversible airfoil is necessary. This type of airfoil is mostly used for fan. As the fan should be used for gas exchange between internal space and exterior space in subway, tunnel and mining tunnel, it is required that the fans can be operated in both forward and backward direction. The reversible operation of fan makes there are many difficult problem for designing. The efficiency of forward ventilation, backward ventilation and aerodynamic performance should be identical. To ensure the consistency of forward and backward performance, the designing of airfoil has played an important role. The research in the paper is to design the reversible airfoil with excellent performance which can be used into various medium.In this paper, CFD method was used for calculation. Through using the business software NUMECA and Pro/E three-dimensional shape software, two kinds of symmetrical airfoils have been designed. Two kinds of wing airfoils have been selected, and half of the wings has been counter rotated180°to be connected to the original airfoil. The symmetrical airfoils are completed. The performance of two kinds of airfoils have been compared, and the airfoil with more excellent has been selected.To ensure the consistency of the forward and backward performance, the airfoil with more excellent symmetry had been selected, and designed a kind of reversible fan with front and back guide vane. The parameters of reversible fan with front guide vane, back guide vane and with no guide vane could be separately calculated. The effect of guide vane to reversible fan had been studied, and the reversible fan with excellent forward and backward ventilation performance had been completed.For the further designing and optimization of the former excellent airfoil, several anti-asymmetric reversible airfoils with S shaped have been designed. The original airfoil was zoomed in proportion, which had been connected to the outlet of the original airfoil in turns. After smoothing disposed, new airfoils were formed. Comparing with the performance of the asymmetric airfoils, the asymmetric airfoil with optimal chord length in reverse connection had been designed.