不同出入口条件下气液喷射器喷射性能的数值模拟

发布时间：2019-02-27 19:53

【摘要】：针对气液喷射器传统二维几何模型和模拟中未考虑温度导致气液相变的不足,建立三维几何模型,导入考虑时间、温度影响的气液相变UDF程序,用CFD软件模拟气液喷射器喷射性能.40000 s条件下有相变的模拟结果与实际情况符合较好.改变气液喷射器出入口气液相的速度和压力条件,得到气液喷射器轴线速度、压力、温度、引射比及气液相体积分数等参数.结果表明,随液化天然气(LNG)入口速度增加,气液喷射器引射比增大,合理的LNG入口速度能使喷射器内各相体积分数及引射比趋于稳定,有利于喷射器正常喷射;随混合出口压力增加,引射比减小,LNG体积分数增大,过大的出口压力会导致气液喷射器内喷射偏斜、扩散室出口气相闪蒸汽(BOG)液化现象,不利于喷射器正常喷射.液相入口速度11~12 m/s、混合出口压力0.101~0.304 MPa时,气液喷射器喷射性能最优.
[Abstract]:In view of the deficiency of the traditional two-dimensional geometric model of gas-liquid ejector and the simulation of gas-liquid phase transition without considering temperature, a three-dimensional geometric model is established, and the UDF program considering time and temperature is introduced. CFD software is used to simulate the jet performance of gas-liquid ejector. The simulation results of phase transition at 40000 s are in good agreement with the actual situation. The parameters such as axial velocity, pressure, temperature, ejector ratio and volume fraction of gas-liquid phase were obtained by changing the velocity and pressure of gas-liquid ejector in and out of gas-liquid phase. The results show that the injection ratio of the gas-liquid ejector increases with the increase of the inlet velocity of liquefied natural gas (LNG). Reasonable LNG inlet velocity can make the volume fraction and the ejection ratio of each phase in the injector tend to be stable, which is beneficial to the normal injection of the injector. With the increase of the mixing outlet pressure, the injection ratio decreases and the volume fraction of LNG increases. The excessive outlet pressure will lead to the deviation of the gas-liquid ejector and the phenomenon of (BOG) liquefaction of the gas-phase flash steam at the outlet of the diffuser, which is not conducive to the normal injection of the ejector. When the inlet velocity of liquid phase is 11 ~ 12 m / s and the pressure of mixing outlet is 0.101 ~ 0.304 MPa, the injection performance of gas-liquid ejector is the best.
【作者单位】：辽宁石油化工大学石油天然气工程学院;
【基金】：国家自然科学基金资助项目(编号:51201009) 辽宁省教育厅科学研究一般项目(编号:L2016017) 辽宁省自然科学基金项目(编号:20170540591)
【分类号】：TQ051.21

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