| Widely applied in the field of thermal power plant, coal mine, tunnel and subway etc, adjustable rotor blade axial fan is one of the commonly used industrial equipment, so pursuit of adjustable rotor blade axial fan performance, high efficiency for the full utilization of energy has practical significance. The main part of the adjustable rotor blade axial fan is generally used in the structure of adjustable rotor blade plus back guide vane, without back guide vane, the fan has a lot of Circumferential kinetic energy loss at the exit of the rotor blades, as the main structure for recovering this part of Circumferential kinetic energy, back guide vane play a significant role in the process which the exit flow kinetic energy of the rotor blades into static pressure. Design a reasonable back guide vane can effectively improve the performance of the fan, so as to achieve energy savings. Based on this background, the task with rotor blade of adjustable rotor blade axial fan as the research foundation, design a good back guide vane to match it, meet the original fan performance curve.First, using the existing 3D model of the rotor blade as a single-stage aerodynamic analysis at two different installation angle, obtain reasonable design point and the required parameters to design back guide vane, then use the theoretical calculation to determine the detailed geometry parameters of back guide vane, build 3D model of two back guide vanes in the software Axstream, besides, complete modification and optimization. Two back guide vane and different installation angle rotor blade are matched together to complete 3D aerodynamic performance computing in more conditions, found that the design of the back guide vane when the rotor blade installation angle is 15 degree with the original rotor blade are better than when the rotor blade installation angle is 5 degree, finally, choose this back guide vane model when the rotor blade installation angle is 15 degree as design result.Further, analyzing interior flow field details of fan on operating condition point through limit flow lines, pressure contours, the relative velocity and isentropic cloud intuitively, besides, changing in flow and rotor blade installation angle, comparing the calculation results, summarizing the variation of the performance parameters, also verifying the design of back guide vane is reasonable.With efficiency as the objective function, application Design 3D module in NUMECA to optimize the 3D back guide vane which has been designed. Then the optimization of the model can be matched with the original rotor blades to complete 3D performance computing, and obtain results, shows that the optimization is reliable.Final, the optimized blade is machined to conduct an experiment on fan with designed back guide vane according to the operating condition, its performance meet the requirements. |
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