Investigation of the Characteristics of Variable Tandem Stator and Its Influence on the Performance of Fan
In order to explore the advantage mechanism and flow rate adjustment limit of the variable tandem stator compared with the conventional stator,the variable-angle performance of a two-stage fan under the condition of the conventional stators and the variable tandem stators is analyzed by numerical simulation.The results show that the flow angle at the exit of the stator determines the flow rate of the rotor components in next stage,the flow rate of the stator components can be increased by opening the front blades of the tandem stator,and the overall flow rate of the fan is limited by the flow rate of the stator components.For the intermediate stage,adjusting the conventional stator will cause the change of the inlet and outlet geometric angles to be unmatched.After changing to tandem stator,adjusting the appropriate front blade angle will greatly reduce the stator loss and increase the flow capacity under the same outlet geometric angle.For the exit stage,the tandem stator can adjust the front blade of the series to achieve higher flow capacity and less loss on the premise of ensuring the flow direction of the fan outlet.Compared with the conventional scheme,the efficiency of the tandem scheme is increased by 10％.
flow rate adjustmentmultistage fanvariable tandem statorstator matching adjust-ment
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