(Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University, 1985) Jery, Belgacem; Brenne, Christopher E.; Caughey, Thomas K.; Acosta, Allan J.; International Pump Users Symposium (2nd : 1985)
Forces are exerted on a centrifugal pump impeller, due to the asymmetry of the flow caused by the volute or diffuser, and to the motion of the center of the impeller whenever the shaft whirls. Recent work in the measurement of these factors, as a function of the whirl speed to shaft speed ratio, and the influence of the volute, is reviewed. These forces may be decomposed into a steady force, a static stiffness matrix, a damping matrix and an inertia matrix. It is shown that for centrifugal pumps of the moderate specific speed typical of boiler feed stages, there is a region of potential shaft vibration excitation from the hydrodynamic forces if the operating speed is well above the first flexural critical speed.