Parametric Control of the Hydraulic Machinery Impeller Based on Free-Form Deformation

Abstract According to the limitation of the parametric design of the impeller shape when implement the optimization the hydraulic machinery impeller, the free-form deformation(FFD) method is proposed to parameterize the impeller blade surface. The impeller blade is implanted to the control volume which is equally subdivided by control point. The control volume and the object which we wish to deform are imagined to be flexible. The control volume can be deformed by move the control lattice in it, thereupon the object is deformed also. The blade shape can be parameterized conveniently. The calculation of the deformation of the centrifugal pump blade shows that the proposed theory and method here are rational.