Optimization Design of Compound Immobile Impeller of Helico-axial Multiphase Pump

Taken the YQH-100 gas-liquid helico-axial multiphase pump as research object, the optimization design of the compression unit of axial blade length was carried out and numerical simulations were conducted based on the commercial software FLUENT 18.0. By using water and air as medium, numerical simulations were conducted on different length compound immobile impeller number of YQH-100 composite guide vane of multiphase pump under different flow rates and different conditions of gas volume fraction (GVF).The pressure field and gas content distribution of the compression unit were derived and the pressure curve, the head curve and efficiency curve under different working conditions were calculated further. The results show that when the blade number of composite guide vane is 8-8, the efficiency and pressurization effect of the multiphase pump are obviously higher than those of the other two cases. The other two compression unit of gas-liquid separation is more serious. The worst places of gas-liquid separation lie in the 2/3 chord length of the tail of guide vanes pressure surface. There is excessive local pressure and larger eddies located in blade tip of guide vane. Theperformance of the compression unit can be improved when the blade number of composite guide vane is 8-8.