Experimental Determination of the Dynamic Transfer Matrix for a Pump

Abstract

Dynamic instability in pumping systems can be the cause of a wide variety of difficulties. Analytical investigations of the dynamic behavior of such systems depend on the proper mathematical model of the dynamic performance of the pump. This paper is concerned with the experimental means and analysis procedures for obtaining the transfer matrix representing the pump as a four-pole element. Direct measurement of the pulsating flow is omitted in favor of an indirect determination utilizing multiple pressure measurements in reference pipe sections attached to the pump. The method of parameter extraction from redundant experimental data, as well as the modeling by an equivalent electrical network is shown. Results are presented for noncavitating and slightly cavitating flows. The quality of the results is an indication that the method utilized represents a successful way to determine the dynamic transfer matrix for a pump.