Fans are the heart of the system and play a significant role in the manufacturing process in the industry. The design of a suitable fan with a good performance curve and material matched to the process demand is the most important principle. The fan-axis is referred to an air ventilator in which the air flow is parallel to the propeller shaft. The propeller has an airfoil section and rotates inside a cylindrical container. The efficiency of these ventilators is about 70% to 80%, and in some special designs, it even reaches 90%. Under equal operating conditions, a vertical fan will be smaller than a centrifugal fan.
The design and construction of a fan as a turbomachine requires a profound empirical understanding and sufficient knowledge of fluid mechanics. The issue of designing and manufacturing industrial ventilation is, in fact, an abstract and integrating the consciousness between theory and experience. The design of the fan, discharge and compression components is provided by the machine with the best energy conversion efficiency.
In this analysis, it has been tried to simulate and analyze the fluid flow in a vertical fan with a stator by Ansys Fluent software.
The geometry required for this analysis was generated by the Gambit software. Meshing is also required for this analysis by the same software. The type of meshing used in this analysis is structural and the total number of cells produced for this geometry is 73217.
In this analysis, K-epsilon standard Turbulence Viscosity Model was used to check the flow. The Standard Wall function is also considered near the walls. In this analysis, the rotary reference method is used to model the rotor rotation. In this analysis, the Cell Zone Condition for the rotor part is used for the Frame Motion tab and is given to the rotor a speed of 1800 rpm.
The flow inlet for this geometry is defined for the rotor and stator separately, and for both of them, Pressure-Inlet condition is defined. It is considered as gauge pressure and its value for the inlet air through the stator solving range is 0 pascal. The outlet of the rotor is located to the stator’s inlet and the stator outlet is considered to the Pressure-Outlet. The rotor and hub walls are defined as Wall. The walls of the stator are also defined as Wall.
According to the type of flow in this analysis which is rotational, the SIMPLE algorithm is used to discretize the coupled equation of velocity and pressure. The momentum equation has been discretized as Second Order Upwind.
The results are presented as velocity contours as well as streamlines.
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