Analysis of Transient Characteristics of Submersible Tubular Pump During Runaway Transition

In order to study the transient characteristics of submersible tubular pump in process power failure, 6DOF model was used carry out three unsteady numerical values for whole flow channel pump. The results show that calculation based on fourth-order multi-point Adams–Moulton formula are better agreement with experimental than first-order format predict impeller motion. When unit is powered off, speed and device decrease rapidly time. At maximum head 3.41 m, when enters runaway condition, about −1.88 times initial rate −1.98 flow. axial force radial increase alternately, compared normal operating significantly increased. changing from forward reverse flow, internal state relatively chaotic, there a large number vortices channel, which easy cause structural vibration. Before reaching state, also appear inside guide vane, causing blockage, especially zero. same time, impact causes local pressure blade surface increase, threatens stability structure. at inlet, outlet, vane outlet monitoring points largest near zero smallest during runaway. main frequency pulsation pass ( f BRF ) its harmonics (2 , 3 5 etc.), intensity increases speed. this provide theoretical reference operation ensure safety pumping station.