METHOD TO DETERMINE PUMP EFFICIENCY Russian patent published in 2004 - IPC

FIELD: hydraulic engineering; aircraft and space vehicles. SUBSTANCE: invention can be used for determining efficiency of pumps experimentally. According to proposed method, fixed amount of working medium is transferred by means of pump under testing through heat insulated closed hydraulic circuit furnished with controlled restrictor and expansion tank. At each test pressure differential across pump and temperature of working medium at pump inlet are measured during fixed period of time. Efficiency of pump is calculated by formula with due account of preliminarily found values of hydraulic resistance of closed hydraulic circuit, mass of working medium in circuit space, mass of material of closed hydraulic circuit and, at each test, speed of pump shaft is measured. EFFECT: simplified measuring system of test, increased accuracy of determination of pump efficiency, possibility of diagnosing pumps of different types without demounting from objects. 1 dwg