Numerical Simulation Of The Flow Field In An Inducer And The First Stage Impeller In The High-speed Boiler Feed Pump

It is a very difficult technologic problem that how to easily and high-efficiently turn away the cavitation of the high-speed boiler feed pump for the large capacity electricity power units. Recently, with the progress of inducer's technology some highspeed boiler feed pump only applied it to settle the problem have been used for an overhaul period.A finite volume based software, FLUENT, to simulate the flow field in an inducer and the first stage impeller in the boiler feed pump under three different flow rate, 70.03 L/s, 52.45 L/s and 35.66 L/s. The governing equations for the flow fields are conservation of mass and momentum equations. For the turbulence calculations, a high Reynold number k-ε turbulence model is used. Multiple rotating frames technique has been used to simulate the flow fields.The fluid flow in the pump rotates and accelerates by the inducer's motion, while the transition segment makes it distribute smoothly and flow into the first impeller. The flow fields are influenced by the boundary layer on inducer, impeller, transition segment and wall.Simulated results match the experimental observations of the boiler feed pump. In the present study, also conduct a analysis about hydrodynamic efficiency of the boiler feed pump. And, the results have been compared with the results of experimental observations of the boiler feed pump.