The Influence of Bulb Position on Hydraulic Performance of Submersible Tubular Pump Device

In order to study the influence of position bulb on hydraulic performance a submersible tubular pump device, based large-scale pumping station, two schemes—involving front-mounted and rear-mounted bulb, respectively—were designed. The scheme uses GL-2008-03 model its conventional guide vane, while optimized design diffuser vane. method combining numerical simulation experimental testing was used analyze differences between external internal characteristics schemes. results show that, under condition reasonable diffusion vane design, efficiency is higher than that scheme, where highest difference about 1%. Although reduces loss section, placement water inlet side flow conditions impeller. Affected by circulation outlet, outlet channel greater scheme. plays rectifying function when placed behind, which greatly eliminates annular volume has smaller loss. inside squeezes outer wall, causing entropy production near wall area. mainly in section support. This research can provide reference for form selection great engineering significance.