螺旋流对环形射流泵性能影响的数值模拟

Numerical Investigation on Influence of Spiral Flow on Performance of Annular Jet Pump

为了提高环形射流泵的输送效率,本文提出了一种利用导叶结构形成螺旋流的螺旋流环形射流泵。利用数值模拟的方法研究不同工作压力下的螺旋流环形射流泵和原型泵的速度、压力和湍动能分布计算结果,来分析螺旋流对环形射流泵的性能影响。数值模拟结果表明:在工作压力为130 kPa时,螺旋流使环形射流泵的流量比增加了43.1%,压力比降低了22.8%。螺旋流降低了环形射流泵喉管内的静压,更容易引起空化。螺旋流使得环形射流泵的效率在工作压力低于160 kPa时大于原型泵。螺旋流环形射流泵内具有更大的湍动能分布区域。随着工作压力升高,两种结构的环形射流泵湍动能分布差别减小。导叶阻力对螺旋流环形射流泵的效率有着重要的影响。

To improve the transport efficiency of the annular jet pump(AJP),a spiral flow annular jet pump(S-AJP)with guide vane structure to form a spiral flow was proposed in this paper.The numerical simulation was conducted to study the velocity,pressure and turbulent kinetic energy distribution of the S-AJP and the AJP under different working pressures,and the influence of spiral flow on the performance of the S-AJP is analyzed.The simulation results show that when the working pressure is 130 kPa,the spiral flow increases the flow ratio of the AJP by 43.1%and the pressure ratio decreases by 22.8%.The spiral flow reduces the static pressure in the throat of the S-AJP and causes cavitation more easily.The spiral flow makes the efficiency of the S-AJP higher than the AJP when the working pressure is lower than 160 kPa.Compared with the AJP,the S-AJP has a larger turbulent kinetic energy distribution area.As the working pressure increases,the difference of the turbulent kinetic energy distribution between the two structures of the AJP decreases.The resistance of guide vane has an important effect on the efficiency of the S-AJP.