轴承支座对轴流风机性能试验的影响

Effects of Bearing Support on Performance Test of Axial-Flow Fan

为了研究风机性能试验中支承结构与风机出口的距离对性能试验的影响,采用理论分析和CFD数值模拟相结合的方法进行研究。分析轴流风机性能试验中C型装置的轴承支座对出口气流的阻碍作用。利用FLUENT软件对试验装置的三维流场进行数值模拟,计算了轴承支座与风机出口的距离不同时,全压效率与流量间的关系,并用ANSYS对结构进行了强度和刚度分析。结果表明轴承支座距离风机出口过近时会显著影响试验结果,应在风机性能试验台的设计过程中加以注意。

CFD numerical simulation combined with theoretical analysis were used to research and discuss the obstructing effect,caused by the bearing support of type-C device,on the outlet airflow in axial-flow fan performance test. The three-dimensional flow field in test device was simulated through FLUENT. The relations between total pressure efficiency and flow rate were studied when the distance between bearing support and fan outlet was different,and the structural strength and stiffness were also analyzed through ANSYS. The results indicated that test results were significantly affected when bearing support was too close to fan outlet,so particular consideration should be taken into the design of fan performance test device.