Obtaining of dependence of sustained angular rotor speed of centrifugal pump with hydrostatic bearings

Manned and cargo vehicles in space industry often use low-capacity centrifugal pumps with direct-current motors with hydrostatic bearings. Such pumps have plenty of benefits, but their main drawback is instability of characteristics. It is caused by wide spread of rotor frequency which influences other parameters. This article describes mathematical model of rotor start-up developed and solved in order to determine sustained rotation frequency. Dependence between angular rotation speed of rotor shaft and all basic construction parameters of pump was determined by Runge-Kutta numerical method with varied pitch. (paper)