喷嘴调节锥对水蒸气喷射泵性能影响的数值模拟.

The throat area of the nozzle is important for the performance of the steam ejector， a variable area nozzle structure which is capable to adjust the nozzle throat area by adjusting the position of spindle is proposed and the numerical analysis toward the influence of the spindle positions on the performance of the steam ejector is also discussed. The velocity flow field， axial pressure distribution and near-wall flow field of the steam ejector under different spindle positions were compared. The results showed that under the same working condition， the spindle position can significantly affect the performance of the steam ejector. With the decreasing of nozzle throat area， the shock wave position in the jet pump was shifted to the inlet direction， and the intensity was continuously weakened. The phenomenon of boundary layer separation is weakened first and then enhanced. When the nozzle spindle position is around 15 mm， the performance of jet pump reached the best value. [ABSTRACT FROM AUTHOR]