Static Characteristics of the Impeller of an Axial Flow Fan Under Rotating Stall Conditions

Based on Realizable k-eturbulent model,the flow field in an axial flow fan was numerically simulated under rotating stall conditions,while the static characteristics of its impeller was studied using finite element method and fluid-structure interaction theory with software Ansys.Results show that under rotating stall conditions of fan,a stall cell exists in the impeller with its propagation direction same as the rotation direction of the impeller.The equivalent stress distribution is greatly influenced by the centrifugal force,but slightly influenced by the rotating stall.The maximum equivalent stress of impeller is found to be lower than the material yield limit,proving the impeller to be safe.The aerodynamic force has important influence on the impeller total deformation.Under stall conditions,maximum total deformation appears in the area of stall cell center,which is 72.2%larger than the design condition.