Design And Parametric Research On The Power Section Of Wind Tunnel

As the power segment is the power source of airflow in the wind tunnel, the technical indexes ofwhich, such as flow details, supercharged performance and efficiency, receive great attention.However, the research on the power segment mainly relys on the traditional theory, experience andexperimental data, which are not only of high cost, but also generally imprecise. The development ofcomputer technology and computational fluid dynamics prompted numerical simulation used in thestudy of axial fan,which has important significance for understanding internal unsteady flow,improving the efficiency of the power segment, reducing fan noise, as well as ensuring the normaloperation of the wind tunnel.The flow field of the power segment of NH-2low-speed wind tunnel of NUAA was simulatedwith six kinds of turbulence models of FLUENT. The static pressure’s increment of the powersegment, X-axial moment of8blades, the distribution of static pressure in the inlet surface of powersection and X-axial distribution of static pressure in power segments were focused on. Then, theRNG model was elected as the turbulence model in the following research of this paper.On this basis, the influence law of the some structural parameters, such as blade angle, tipclearance, angle of the prerotation vane and the presence or absence of the prerotation vanes andantiswirl vanes, on the fan’s pressurization, pressurization of power segment and the quality of theflow field was respectively analyzed in this paper. Finally, a new axial-fan and ancillary piping systemwas designed according to the requirements of design,and supercharged performance of fan wassimulated. The simulated results showed that the axial-fan could meet the requirements of design.The research object of this paper had big size, complex structure and small tip clearance,so largeamount of high-quality grids were required, which was the difficult point of this article. The analysisof the effect of the prewhirl vane’s angle and the presence or absence of the prerotation vanes andantiswirl vanes on the fan’s pressurization was groundbreaking.