To obtain the establishment process and change rule of vapor core in the fuel vapor core pump

based on renormalization group (RNG) k-ε double-equation turbulence model and Schnerr-Sauer cavitation phase transition model

a fuel vapor core pump with radial straight blades was studied by overall three-dimensional geometry modeling and steady vapor-liquid two-phase numerical simulation. And the vapor phase region under the influences of rotation speed

throttle opening and outlet pressure was further analyzed. Results show that

the vapor core enlarges with the increasing rotation speed within a certain range of rotation speed

while the vapor core lessens as the outlet pressure increases at a constant rotation speed. When the vapor phase region expands to the limit position

namely passing through the impeller outlet

the vapor core pump runs under the unstable condition. Both RNG k-ε double-equation turbulence model and Schnerr-Sauer cavitation phase transition models can be applied to numerical simulation on vapor core configuration in the fuel vapor core pump.