Patent ID: 6466896
Filing Date: 2002-10-15
Classification: F04D

Abstract:
A performance analysis method of centrifugal impeller, the method for measuring a flow field at an impeller exit to analyze an exit flow angle, total pressure ratio and efficiency, thereby enabling to analyze performance of the manufactured centrifugal impeller, wherein the flow field of the centrifugal impeller at the impeller exit is dualized into a jet region flow field and a wake region flow field, by which each flow field thereof is sought and averaged to obtain the flow field; andwherein the flow slip coefficient of the jet region and the wake region flow field in consideration of mass ratio change at wake region are obtained by Formula below: Î¼j=1-f1&it;A2&it;jr2&it;b2&it;Z,f1=5.73Ã—10-6&it;(90-Î²2&it;b)5/2&mgr;j: flow slip coefficient of jet region A2j: jet region area at impeller exit r2: radius of impeller b2: exit width of impeller Z: number of blades at impeller exit &bgr;2b: impeller blade exit angle (axially interpreted) &khgr;=0.93&egr;2+0.07&egr;&khgr;: wake region flow field &egr;: wake area ratio (Aw/Ag).