Computational Model and Characteristics of a Double-Acting Valveless Piston Pump

Abstract

The working process in a double-acting piston pump in which the valves have been replaced by fluidic diodes is investigated. A computational model of the process, constructed on the basis of a representation of a complex stream by a sum of two simple streams, the first caused by the harmonic movement of the piston and the second due to the head difference between the dampers, is proposed. Analytic expressions of the flow–head characteristics and the pump efficiency are obtained. It is shown that, unlike a piston pump with valve distribution, the flow–head characteristic of a pump with fluidic diodes is descending and flattened. In the region of low heads, its delivery may exceed the delivery of a pump with valves. There is an interval of heads on the characteristic in which the efficiency of the pump is maximal.