水蒸气喷射泵的数值研究

Modeling and Simulation of Steam-Jet Vacuum Pump

建立了描述水蒸气喷射泵内部跨音速流动的理论模型。以FLUENT 12.0为计算平台,采用计算流体力学(CFD)方法,获得沿喷射泵轴向静压分布数值模拟结果,并与实验数据进行对比,两者很好的一致性验证了理论模型的适用性。CFD数值模拟结果表明,数值模拟方法能够准确捕获到喷射泵内部跨音速激波流动行为,为理解喷射泵内在抽汽机制提供了帮助。基于湿蒸气模型的数值模拟结果显示,湿蒸气模型能够捕获到喷嘴内工作蒸气的自发凝结现象,更准确地预测了水蒸气喷射泵的抽气特性,对喷射泵的结构优化和性能提高更具指导意义。

The flow characteristics of the steam-jet vacuum pump were approximated,modeled by transonic flow,simulated with the fLUID dynamics（ CFD） code of the software package Fluent 12. 0,and measured,to fully understand the flow behavior of the primary and secondary fluids. The simulated and measured results of the static,axial pressure distribution along the mixing chamber wall were found to be in fairly good agreement,proving the validity of the newly-developed model. The simulated results show that a spontaneous condensation occurs as the steam passes the nozzle. Interesting finding was that the simulated data with an ideal gas are very close to our calculated results with the steam. In addition,the simulated results were found to agree well with those recently reported in the references.